| Вид документа | Інструкція |
|---|---|
| Виробник | JCI |
| Моделі | YK, 160-54-OI-GB0 |
| Група обладнання | automation |
| Мова документа | англійська |
| Розмір файлу | 1.8 МБ |
Про документ
The YORK OptiView Control Panel is a microprocessor based control system for YK centrifugal chillers. It controls the leaving chilled liquid temperature via pre-rotation vane (PRV) controls and can limit motor current via control of the PRV. It is compatible with electro-mechanical starter, optional YORK Solid State Starter (SSS) and optional Variable Speed Drive (VSD) applications.
Ключові дані
| Leaving chilled liquid temperature setpoint range | 3.3°C (38°F) … 21.1°C (70°F) water cooling; -12.2°C (10°F) … 21.1°C (70°F) brine/glycol |
|---|---|
| Remote analogue signal ranges | 0-20 mA, 4-20 mA, 0-10 Vdc or 2-10 Vdc |
| Access levels | View / Operator / Service |
| Trend data points | 450 data points across X-Axis, up to 6 parameters |
| Post-lube duration | 150 seconds |
| Pre-lube duration | 50 seconds standard (or 180 seconds) |
| Condenser high pressure safety | >1241 kPa (180 PSIG), restart <827.5 kPa (120 PSIG) |
| Anti-recycle time | 30 minutes |
Застосування
- Control of leaving chilled liquid temperature on YK centrifugal chillers
- Motor current limiting via PRV control
- Local and remote start/stop control
- Energy Management System (EMS) interface
- Standalone or group operation via ISN networking
Особливості
- Full screen LCD graphic display with keypad interface; several operating parameters displayed at once
- Metric (SI) or English (Imperial) units in multiple languages
- Graphical representation of historical and present unit operation
- Records cause of shutdowns (Safety, Cycling or Normal); stored battery backed
- Three access levels: View (default), Operator, Service
- Master switch with STOP/RESET, RUN and START positions
- Scheduling with standard weekly start/stop times plus exception weeks up to 6 weeks in advance
- Trends screen plots up to six parameters in X/Y graph format (one-screen or continuous)
- Custom screen for up to 10 service-selected parameters
- Printer interface with automatic logging and report printing
Технічні дані
| Parameter | Value |
|---|---|
| Display | Full screen LCD graphic display |
| Keypad | Numeric keypad, cursor keys, +/- key, ✓ Enter key, X Cancel key |
| Master switch positions | STOP/RESET, RUN, START (momentary) |
| Setpoint range (water cooling) | 3.3°C (38°F) to 21.1°C (70°F) |
| Setpoint range (brine/glycol) | -12.2°C (10°F) to 21.1°C (70°F) |
| Setpoint range (water cooling, Smart Freeze enabled) | 2.2°C (36°F) to 21.1°C (70°F) |
| Range offset | 5.6°C (10°F) or 11.1°C (20°F); default 11.1°C (20°F) |
| Cycling offset - shutdown | 0.56°C (1°F) to 35.6°C (64°F), minimum cut-out 2.2°C (36°F) water (1.1°C (34°F) with Smart Freeze) or -14.4°C (6°F) brine/glycol |
| Cycling offset - restart | 0°C (0°F) to 21.1°C (70°F), maximum restart 26.7°C (80°F) |
| Current limit setpoint range | 30 to 100% of FLA |
| Remote analogue input signals | 0-20 mA, 4-20 mA, 0-10 Vdc or 2-10 Vdc; PWM digital remote |
| Operator access timeout | Reverts to VIEW after 10 minutes without a key-press |
| Anti-recycle time | 30-minute anti-recycle timer |
| Post-lube duration | 150 seconds |
| Pre-lube duration | 50 seconds standard (or 180 seconds per program switch) |
| Trend data points | 450 data points across X-Axis |
| Trend parameters | Up to 6 parameters simultaneously |
| History log | Last 10 safety or cycling shutdowns |
| Proximity probe supply voltages | +12 Vdc (shutdown < +9.5 Vdc, restart > 10.0 Vdc) or +24 Vdc (shutdown < +19.0 Vdc, restart > 19.7 Vdc) |
| Evaporator low pressure warning threshold (water) | Fixed at 186.2 kPa (27 PSIG) |
| Condenser high pressure warning reset | Clears when pressure decreases to 34.5 kPa (5 PSIG) below setpoint |
| Condenser high pressure safety | Shutdown >1241 kPa (180 PSIG); restart <827.5 kPa (120 PSIG) |
| Condenser pressure transducer range | 47 kPa (6.8 PSIG) to 2068.5 kPa (300 PSIG) |
| Oil pressure transducer range | 0 kPa (0 PSIG) to 2172 kPa (315 PSIG) |
| Oil low differential pressure | <103.5 kPa (15 PSID) running; must achieve 172.5 kPa (25 PSID) by last 5 s of pre-lube |
| Oil high differential pressure | >620.5 kPa (90 PSID) |
| VSOP differential pressure check | <214.3 kPa (35 PSID) during pre-lube/run |
| Discharge temperature safety | High >104.4 °C (220 °F); low <-1.1 °C (30 °F) |
| Oil high temperature safety | >82.2 °C (180 °F) |
| Thrust bearing proximity clearance | Shutdown >+10 mils or > -25 mils from reference; minimum allowed 23 mils; out of range <17 mils |
| Thrust bearing oil temperature | High >121 °C (250 °F); low <10 °C (50 °F) |
| LCSSS SCR module temperatures | Warning stop >43.3 °C (110 °F), restart <42.8 °C (109 °F); running safety >100 °C (212 °F); low sensor <2.8 °C (37 °F) |
| Harmonic filter input frequency range | 49 to 51 Hz (50 Hz units) or 58 to 62 Hz (60 Hz units) |
| VSD DC bus over-voltage shutdown | >745 Vdc |
| VSD DC bus under-voltage shutdown | <414 Vdc (500 Vdc for 60 Hz applications) |
| VSD input voltage specified range | 414 to 508 Vac |
| VSD harmonic filter DC bus over-voltage | >860 Vdc |
| VSD internal ambient trip | 60 °C (140 °F) |
| VSD heatsink temperature safety | >70 °C (158 °F); low <2.8 °C (37 °F); thermistor resistance 10K ohms at 21.1 °C (70 °F) |
| Harmonic filter heatsink trip | >75 °C (167 °F) |
| Harmonic filter TDD shutdown | Total demand distortion >25% for 45 seconds |
| Maximum instantaneous motor currents (VSD) | 351/292 HP: 771 A; 503/419 HP: 1200 A; 790/658 HP: 1890 A |
| Maximum instantaneous filter current | 351/292 HP: 356 A; 503/419 HP: 496 A; 790/658 HP: 745 A |
| Maximum continuous RMS filter current | 351/292 HP: 128 A; 503/419 HP: 176 A; 790/658 HP: 277 A |
| LCSSS invalid current scale selection FLA range | Model 7L: 35 to 260 A; 14L/26L: 65 to 510 A; 33L: 215 to 1050 A |
Варіанти замовлення
- Starter variants: Electro-mechanical starter (EM), YORK Solid State Starter Mod 'A' and Mod 'B' (LCSSS, liquid cooled), Variable Speed Drive (VSD)
- Options referenced: Variable Speed Oil Pump (VSOP), Hot Gas By-pass, Analogue I/O Board, Harmonic Filter, Smart Freeze
- Flash memory card versions referenced: C.MLM.01.01, C.MLM.01.02, C.MLM.01.03, C.MLM.01.04
Текст документа
YK CENTRIFUGAL LIQUID CHILLER
OptiView Control Panel
OPERATION INSTRUCTION
Effective from 11/00
GB
i 160-54-OI-GB0
Contents
1 HOME SCREEN 4
2 SYSTEM SCREEN 5
3 EVAPORATOR SCREEN 6
4 CONDENSER SCREEN 8
5 COMPRESSOR SCREEN 9
6 OIL SUMP SCREEN 10
7 MOTOR SCREENS 11
7.1 EM STARTER SCREEN 11
7.2 SOLID STATE STARTER SCREEN 12
7.3 VSD SCREEN 13
8 SETPOINTS SCREEN 15
8.1 SETUP SCREEN 17
9 HISTORY SCREEN 22
9.1 TRENDS SCREEN 23
9.2 CUSTOM SCREEN 26
10 DISPLAY MESSAGES 27
10.1 SYSTEM STATUS Messages 27
10.2 SYSTEM DETAILS Messages 28
10.3 Cycling Shutdown Messages 31
10.4 Safety Shutdown Messages 39
160-54-OI-GB0 1
OptiView Control Panel
Numeric
Keypad
1 2 3
4 5 6 Cursor Keys/
7 8 9 Cancel and
+ Enter
0 -
Master
Switch
Display Soft keys for Control and Navigation
The YORK OptiView Control Panel (Graphic Control Information on the display falls into three distinct groups:
Centre) is a microprocessor based control system for Display Only, Programmable, and Navigation. The
YK centrifugal chillers. It controls the leaving chilled Programmable values and Navigation commands are
liquid temperature via pre-rotation vane (PRV) controls subject to access level control.
and has the ability to limit motor current via control of the
PRV. It is compatible with electro-mechanical starter, Display Only information is read-only parameters
optional YORK Solid State Starter (SSS) and optional about unit operation. This information may be
Variable Speed Drive (VSD) applications. represented by a numerical value, a text string, or an
LED image. For numerical values, if the monitored
The panel has a full screen LCD graphic display with a parameter is above the normal operating range, the high
keypad interface. The graphic display allows the limit value will be displayed along with the '>' symbol; if it
presentation of several operating parameters at once. In is below the normal operating range, the low limit value
addition, the operator may view a graphical will be displayed along with the '<' symbol. In some
representation of the historical operation of the unit as cases, the value may be rendered invalid by other
well as the present operation. conditions and the display will use X's to indicate this.
For ease of use the locations of displayed parameters Programmable information can be changed by the
are clearly and intuitively marked and instructions for operator/service technician to program system settings,
specific operations are provided on many of the the operator/service technician must be logged in with
screens. Information can be displayed in both metric (SI the appropriate access level.
- temperatures in °C and pressures in kPa) or English
(Imperial - temperatures in °F and pressures in PSIG) Navigation allows movement between the different
units in a number of languages. screens.
The control panel also displays the unit operation using
status and warning messages and records the cause of
any shutdowns (Safety, Cycling or Normal). This
information is stored in battery backed for viewing.
2 160-54-OI-GB0
Access Level Three access levels are available: Setpoint Programming
View Setpoint values are used to control the unit and devices
connected to the system. Setpoints can be numeric
This is the default access level (available automatically values (such as 7°C for the Leaving Chilled Liquid
when power is applied to the unit) allowing navigation of Temperature), or an Enable or Disable function. The
the screens and access to display only information. following procedure applies when programming
setpoints:
Operator
n Press the desired setpoint key and a dialogue box
This access level is entered using the 'LOGIN' button on appears displaying the present value, the upper
the 'HOME SCREEN'. A User ID and Password have to and lower limits of the programmable range, and
be entered using the numeric keypad. 'OPERATOR' the default value.
access automatically reverts to the 'VIEW' after 10
minutes without a key-press. The 'OPERATOR' access n When the dialogue box begins with the word
level allows navigation of the screens, access to display 'ENTER', the numeric keys should be used to enter
only information and programming of a number of the desired value. Leading zeroes are not
system settings. necessary. If a decimal point is necessary, press
the ' ' key.
'OPERATOR' access level can also be
entered directly from the 'SETPOINTS Pressing the p key, sets the entry value to the default
SCREEN' without returning to the 'HOME for that setpoint. Pressing the q key, clears the present
SCREEN'. entry. The t key is a backspace key and causes the
entry point to move back one space.
Service n If the dialogue box begins with 'SELECT', use the
t and u keys to select the desired value.
'SERVICE' access level is for qualified service
personnel only. If the previously defined setpoint is correct, press the ' X '
(Cancel) key to dismiss the dialogue box.
The 'soft' keys surrounding the display are redefined
based on the currently displayed screen. The buttons on n Press the ' ✓ ' (Enter) key.
the right side and base of the panel are used for
navigation and selection of parameters. The keypad is If the value is within range, it is accepted and the
used for data entry with a standard numeric keypad dialogue box disappears. The unit will begin to operate
provided for entry of system setpoints and limits. based on the new programmed value. If out of range, the
value will not be accepted and the user is prompted to try
The Decimal key provides accurate entry of setpoint again.
values.
The +/- key allows entry of negative values and AM/PM
selection during time entry.
The ' ✓ ' (Check) key is provided as a universal 'Enter' or
'Accept'' key to confirm changes made.
The ' X ' key is provided as a universal 'Cancel' key to
reject changes made.
Cursor Arrow keys (t u p q are provided to allow
movement on screens which contain a large amount of
entry data. In addition, these keys can be used to scroll
through history and event logs.
160-54-OI-GB0 3
Master Switch There are certain displayed values, programmable
setpoints and controls shown in this manual that
The three-position rocker switch is the master control. are for Service Technician use only. These are
When toggled right, it is in the 'STOP/RESET' position, only displayed when logged in at SERVICE access
the middle position is 'RUN' and when momentarily level or higher. The setpoints and parameters
toggled left it is in the 'START' position. displayed on these screens are explained in detail
in manual 160.54-M1.
In the 'STOP/RESET' position the unit will not run under
any condition, this enables maintenance and other These parameters affect unit operation
tasks to be completed safely. In addition, the switch and should NEVER be modified by anyone
must be placed in this position following certain other than a qualified Service Technician.
shutdowns before the unit is allowed to restart. This
guarantees that manual intervention has taken place
and the shutdown has been acknowledged.
The 'START' position is used to locally start the unit.
When set to this position with no fault conditions, the unit
will enter the system pre-lube (start sequence).
In the 'RUN' position the unit will operate normally and
automatically restart following cycling shutdowns. The
switch must be in this position to receive a valid remote
start signal when operating from a remote control
source.
Remote Control
The control panel expands the capabilities of remote
control and communications. By providing a common
networking protocol through the ISN, YORK units can
be standalone or part of a group.
This new protocol allows increased remote control of the
unit, as well as 24-hour performance monitoring via a
remote site. In addition, compatibility is maintained with
the present network of ISN communications.
The unit also maintains the standard digital remote
capabilities as well. Both of these remote control
capabilities allow for the standard Energy Management
System (EMS) interface:
n Remote Start; Remote Stop and Remote Ready to
Start contacts.
n Remote Leaving Chilled Liquid Temperature
Setpoint and Remote Current Limit Setpoint
adjustment (0-10VDC, 2-10VDC, 0-20mA or
4-20mA) or Pulse Width Modulation.
n Cycling and Safety Shutdown Contacts
4 160-54-OI-GB0
1 HOME SCREEN
The 'HOME SCREEN' is displayed by default (at the System key (see Section 2)
'VIEW ACCESS LEVEL') when the unit is powered on.
This screen shows the main operating values, enables Evaporator key (see Section 3)
system access and permits further navigation to the sub
screens. Condenser key (see Section 4)
The Login/Logout key is used to enter/exit the Compressor key (see Section 5)
'OPERATOR' and 'SERVICE' 'ACCESS LEVEL' from
the 'VIEW ACCESS LEVEL' Oil Sump key (see Section 6)
The Print key should be used to obtain a hard-copy print Motor key (see Section 7)
of the current system status.
Setpoints key (see Section 8)
Th e War ning Reset key is used at
'OPE R A TOR /SERVICE ACCESS LEVE L' t o History key (see Section 9)
acknowledge and reset 'WARNING' messages
(displayed in yellow), refer to Section 10 for details of
display messages and their meaning.
The Message Clear key is used at 'SERVICE ACCESS
LEVEL' to clear 'SAFETY' or 'CYCLING' shutdown
messages (displayed in red and orange), refer to
Section 10 for details of display messages and their
meaning.
160-54-OI-GB0 5
2 SYSTEM SCREEN
The 'SYSTEM SCREEN' displays pressures and
temperatures for the evaporator, condenser,
compressor and oil system. Electrical load and current
limit are also shown.
6 160-54-OI-GB0
3 EVAPORATOR SCREEN
The 'EVAPORATOR SCREEN' displays a cutaway view Range
of the unit evaporator showing current operating
temperatures and pressures, status of the flow switch The programmed 'SETPOINT' can be reset (offset)
and liquid pump signal and the control setpoints. upwards by an analogue signal: (0-20 mA, 4-20 mA,
0-10 Vdc or 2-10 Vdc) in the analogue remote mode, or
The local leaving chilled liquid temperature 'SETPOINT' PWM signal in digital remote mode. The offset
and 'RANGE', and leaving chilled liquid temperature ('RANGE') may be programmed to 5.6°C (10°F) or
cycling offset 'SHUTDOWN' and 'RESTART' values are 11.1°C (20°F) (11.1°C is the default 'RANGE').
also programmed on this screen:
For example, if the 'SETPOINT' is programmed for 7°C
Setpoint and the programmed 'RANGE' is 5.6°C, then the remote
device can set the leaving chilled liquid temperature
Defines the leaving chilled liquid temperature that is to setpoint over the range 7°C to 12.6°C.
be maintained by the unit. The 'SETPOINT' can be
programmed between 3.3°C (38°F) and 21.1°C (70°F) Additionally, a remote GPIC device (in ISN
for water cooling applications or -12.2°C (10°F) and remote mode) can define the setpoint through
21.1°C (70°F) for brine/glycol applications. a serial data stream
When Smart Freeze has been enabled by a
qual i fi ed Service Technician, t he
programmable 'SETPOINT' is 2.2°C (36°F) to
21.1°C (70°F) for water cooling applications.
160-54-OI-GB0 7
Cycling Offset - Shutdown Cycling Offset - Restart
Defines the leaving chilled liquid temperature at which Defines the leaving chilled liquid temperature at which
the unit will shutdown on a 'LEAVING CHILLED LIQUID the unit will restart after a 'LEAVING CHILLED LIQUID -
- LOW TEMPERATURE'. The 'OFFSET' (below LOW TEMPERATURE ' shutdown. The 'OFFSET'
'SETPOINT') can be programmed between 0.56°C (above 'SETPOINT') can be programmed between 0°C
(1°F) and 35.6°C (64°F) to a minimum cut-out of 2.2°C (0°F) and 21.1°C (70°F) to a maximum restart of 26.7°C
(36°F) for water cooling applications (1.1°C (34°F) with (80°F). This 'OFFSET' can be used to reduce unit
Smart Freeze enabled) or -14.4°C (6°F) for brine/glycol cycling by delaying the restart until the cooling load has
applications. increased dramatically.
When the programmed leaving chilled liquid Refrigerant - Service Technicians
temperature 'SETPOINT' is changed, the shutdown is
fixed at of 2.2°C (36°F) for water cooling applications Sensitivity - Service Technicians
(1.1°C (34°F) with Smart Freeze enabled) or -14.4°C
(6°F) for brine/glycol applications for the next ten Brine Low Evaporator Cutout - Service Technicians
minutes.
Smart Freeze - Service Technicians
The shutdown will then revert to the 'SETPOINT' plus
the 'OFFSET' after ten minutes has elapsed.
8 160-54-OI-GB0
4 CONDENSER SCREEN
The 'CONDENSER SCREEN' displays a cutaway view
of the unit condenser showing current operating
temperatures and pressures, status of the high pressure
and flow switches and cooling liquid pump signal and
the refrigerant level position and setpoint.
Refrigerant Level Control - Service Technicians
High Pressure Warning Threshold - Service
Technicians
Drop Leg - Service Technicians
160-54-OI-GB0 9
5 COMPRESSOR SCREEN
The 'COMPRESSOR SCREEN' displays a cutaway
view of the unit compressor showing current operating
temperatures and pressures and status of the switches
and solenoids.
Proximity Probe Calibration - Service Technicians
Pre-Rotation Vanes Calibrate - Service Technicians
VSD Tuning - Service Technicians
Hot Gas - Service Technicians
Pre-Rotation Vanes Control (Open, Close, Hold and
Auto) - Service Technicians
10 160-54-OI-GB0
6 OIL SUMP SCREEN
The 'OIL SUMP SCREEN' displays the unit oil sump
showing current operating temperatures and pressures
and status of the oil pump run signal and solenoid. The
screen will also provide data for the variable speed oil
pump (VSOP) when fitted.
Standby Lube (VSOP) - Service Technicians
Pressure Setpoint (VSOP) - Service Technicians
Variable Speed Oil Pump Control (Raise, Lower, Set
and Auto) - Service Technicians
160-54-OI-GB0 11
7 MOTOR SCREENS
7.1 EM STARTER SCREEN
The 'EM STARTER SCREEN' shows the motor current Pulldown Demand Limit
as a percentage of full load amps (FLA), the current limit
setpoint (set locally (refer to 'LOCAL MOTOR Defines the maximum allowable motor current during
CURRENT LIMIT') or remotely by an analogue signal: pulldown demand limiting at unit startup as a
(0-20 mA, 4-20 mA, 0-10 Vdc or 2-10 Vdc) in the percentage of FLA. This value overrides the 'LOCAL
analogue remote mode, or PWM signal in digital remote MOTOR CURRENT LIMIT' for the time specified in the
mode or via the ISN/GPIC interface in the ISN mode) motor current 'PULLDOWN DEMAND TIME'.
and the pulldown demand time remaining, when
pulldown demand limiting is active. Pulldown Demand Time
The ' LOC A L MO TO R CURRENT LIM I T ' and Specifies the period of time that pulldown demand
'PULLDOWN DEMAND LIMIT' and 'TIME' are also limiting will be active during unit startup.
programmed on this screen:
Local Motor Current Limit
Defines the maximum allowable motor current during
operation as a percentage of FLA. When the motor
current reaches or exceeds the programmed limit the
PRV are prohibited from opening or closed to reduce the
motor current.
12 160-54-OI-GB0
7.2 SOLID STATE STARTER SCREEN
The 'SOLID STATE STARTER SCREEN' shows the Pulldown Demand Limit
motor current as a percentage of full load amps (FLA),
the current limit setpoint (set locally (refer to 'LOCAL Defines the maximum allowable motor current during
MOTOR CURRENT LIMIT') or remotely by an analogue pulldown demand limiting at unit startup as a
signal: (0-20 mA, 4-20 mA, 0-10 Vdc or 2-10 Vdc) in the percentage of FLA. This value overrides the 'LOCAL
analogue remote mode, or PWM signal in digital remote MOTOR CURRENT LIMIT' for the time specified in the
mode or via the ISN/GPIC interface in the ISN mode), motor current 'PULLDOWN DEMAND TIME'.
details of the SSS rating and operating voltage and
current per phase and the pulldown demand time Pulldown Demand Time
remaining, when pulldown demand limiting is active.
Specifies the period of time that pulldown demand
Th e ' LOC A L MO TO R CURRENT LIMIT' and limiting will be active during unit startup.
'PULLDOWN DEMAND LIMIT' and 'TIME' are also
programmed on this screen: Full Load Amps - Service Technicians
Local Motor Current Limit Supply Voltage Range - Service Technicians
Defines the maximum allowable motor current during Current Unbalance Check - Service Technicians
operation as a percentage of FLA. When the motor
current reaches or exceeds the programmed limit the
PRV are prohibited from opening or closed to reduce the
motor current.
160-54-OI-GB0 13
7.3 VSD SCREEN
The 'VSD SCREEN' shows the motor current as a Pulldown Demand Limit
percentage of full load amps (FLA), the current limit
setpoint (set locally (refer to 'LOCAL MOTOR Defines the maximum allowable motor current during
CURRENT LIMIT') or remotely by an analogue signal: pulldown demand limiting at unit startup as a
(0-20 mA, 4-20 mA, 0-10 Vdc or 2-10 Vdc) in the percentage of FLA. This value overrides the 'LOCAL
analogue remote mode, or PWM signal in digital remote MOTOR CURRENT LIMIT' for the time specified in the
mode or via the ISN/GPIC interface in the ISN mode) motor current 'PULLDOWN DEMAND TIME'.
and the pulldown demand time remaining, when
pulldown demand limiting is active. Pulldown Demand Time
The screen also displays the output voltage, frequency Specifies the period of time that pulldown demand
and phase current to the motor, total and cumulative limiting will be active during unit startup.
input Kilowatts and PRV position. In addition, supply
kVA, power factor and voltage and current total VSD Details - see Section 7.3.1
harmonic distortion are shown on models with harmonic
filters. ACC Details - Service Technicians
The ' LOC A L MO TO R CURRENT LIM I T ' and Filter Inhibit and Filter Details - Units with Harmonic
'PULLDOWN DEMAND LIMIT' and 'TIME' are also Filters
programmed on this screen:
KWH Reset - Service Technicians
Local Motor Current Limit
Defines the maximum allowable motor current during
operation as a percentage of FLA. When the motor
current reaches or exceeds the programmed limit the
PRV are prohibited from opening or closed to reduce the
motor current.
14 160-54-OI-GB0
7.3.1 VSD DETAILS SCREEN
The 'VSD DETAILS SCREEN' repeats the motor
current, current limit setpoint and the pulldown demand
time remaining shown on the 'VSD SCREEN'.
The screen also displays the status of the water pump,
precharge relay and trigger SCR outputs, DC bus
voltage, DC inverter link current and internal ambient,
convertor heatsink and phase A, B and C heatsink
temperatures.
For details of programming the 'LOCAL MOTOR
CURRENT LIMIT' and 'PULLDOWN DEMAND LIMIT'
and 'TIME' refer to the 'VSD SCREEN'.
VSD (see Section 7.3)
160-54-OI-GB0 15
8 SETPOINTS SCREEN
The 'SETPOINTS SCREEN' displays the current Range
operating leaving chilled liquid temperature setpoint and
remote range, low leaving chilled liquid temperature The programmed 'SETPOINT' can be reset (offset)
cycling shutdown and restart values and there offset upwards by an analogue signal: (0-20 mA, 4-20 mA,
and the current limit setpoint. 0-10 Vdc or 2-10 Vdc) in the analogue remote mode, or
PWM signal in digital remote mode. The offset
The local leaving chilled liquid temperature 'SETPOINT' ('RANGE') may be programmed to 5.6°C (10°F) or
and 'RANGE', low leaving chilled liquid temperature 11.1°C (20°F) (11.1°C is the default 'RANGE').
cycling 'SHUTDOWN' and 'RESTART' values, 'LOCAL
MOTOR CURRENT LIMIT' and 'PULLDOWN DEMAND For example, if the 'SETPOINT' is programmed for 7°C
LIMIT' and 'TIME' and 'REMOTE ANALOGUE INPUT and the programmed 'RANGE' is 5.6°C, then the remote
RANGE' should be programmed on this screen: device can set the leaving chilled liquid temperature
setpoint over the range 7°C to 12.6°C.
Setpoint
Additionally, a remote GPIC device (in ISN
Defines the leaving chilled liquid temperature that is to remote mode) can define the setpoint through
be maintained by the unit. The 'SETPOINT' can be a serial data stream.
programmed between 3.3°C (38°F) and 21.1°C (70°F)
for water cooling applications or -12.2°C (10°F) and
21.1°C (70°F) for brine/glycol applications.
When Smart Freeze has been enabled by a
qual i fied Service Technicia n, t he
programmable 'SETPOINT' is 2.2°C (36°F) to
21.1°C (70°F) for water cooling applications.
16 160-54-OI-GB0
Cycling Offset - Shutdown Local Motor Current Limit
Defines the leaving chilled liquid temperature at which Defines the maximum allowable motor current during
the unit will shutdown on a 'LEAVING CHILLED LIQUID operation as a percentage of FLA. When the motor
- LOW TEMPERATURE'. The 'OFFSET' (below current reaches or exceeds the programmed limit the
'SETPOINT') can be programmed between 0.56°C PRV are prohibited from opening or closed to reduce the
(1°F) and 35.6°C (64°F) to a minimum cut-out of 2.2°C motor current.
(36°F) for water cooling applications (1.1°C (34°F) with
Smart Freeze enabled) or -14.4°C (6°F) for brine/glycol Pulldown Demand Limit
applications.
Defines the maximum allowable motor current during
When the programmed leaving chilled liquid pulldown demand limiting at unit startup as a
temperature 'SETPOINT' is changed, the shutdown is percentage of FLA. This value overrides the 'LOCAL
fixed at of 2.2°C (36°F) for water cooling applications MOTOR CURRENT LIMIT' for the time specified in the
(1.1°C (34°F) with Smart Freeze enabled) or -14.4°C motor current 'PULLDOWN DEMAND TIME'.
(6°F) for brine/glycol applications for the next ten
minutes. Pulldown Demand Time
The shutdown will then revert to the 'SETPOINT' plus Specifies the period of time that pulldown demand
the 'OFFSET' after ten minutes has elapsed. limiting will be active during unit startup.
Cycling Offset - Restart Remote Analog Input Range
(Flash Memory Card version C.MLM.01.01 or later)
Defines the leaving chilled liquid temperature at which
the unit will restart after a 'LEAVING CHILLED LIQUID - Defines the signal range applied for remote reset of the
LOW TEMPERATURE ' shutdown. The 'OFFSET' leaving 'Chilled Liquid Temperature Setpoint' and
(above 'SETPOINT') can be programmed between 0°C 'Current Limit Setpoint' in the analogue remote mode.
(0°F) and 21.1°C (70°F) to a maximum restart of 26.7°C The value should be programmed for 0-10Vdc if the
(80°F). This 'OFFSET' can be used to reduce unit remote signal is 0-10 Vdc or 0-20 mA. If the remote
cycling by delaying the restart until the cooling load has signal is 2-10 Vdc or 4-20 mA, the value must be
increased dramatically. programmed for 2-10 Vdc.
160-54-OI-GB0 17
8.1 SETUP SCREEN
The 'SETUP SCREEN' displays general configuration Clock (Enabled / Disabled)
parameters as set by the microprocessor board jumpers
and program switches. In addition, it allows the real time Used to enable or disable the real-time clock in order to
clock to be enabled, setting of the time and date and conserve battery life. The clock must be enabled during
specification of the time format: commissioning. For prolonged shutdowns the clock
should be disabled.
Set Date
12/24 Hr
Used to specify the present date, the date is critical to
logging system shutdowns accurately and for utilising Used to specify the time format. 12-Hour time format
the scheduling capabilities. The day, month and includes AM and PM modifiers and shows time between
four-digit year (using leading zeroes as necessary) must 1:00 and 12:59, 24-Hour time format shows times
be entered. between 0:00 and 23:59.
Set Time Schedule (see Section 8.1.1)
Used to specify the present time, the time is critical to User (see Section 8.1.2)
logging system shutdowns accurately and for utilising
the scheduling capabilities. The hour and minute Comms (see Section 8.1.3)
desired (using leading zeroes as necessary) must be
entered. If the unit is in 24-hour mode, the time must be Printer (see Section 8.1.4)
entered in the 24-hour format, otherwise AM or PM must
be selected for the entered time. Sales Order (see Section 8.1.5)
Operations (see Section 8.1.6)
Diagnostics - Service Technicians
18 160-54-OI-GB0
8.1.1 SCHEDULE SCREEN
When programming the 'SCHEDULE SCREEN' the n A standard set of start / stop times can be defined
Select button is used to enable the cursor arrows which which are utilised every week. Exception Start /
are used to highlight the day and the start or stop times Stop combinations for any day of the week up to 6
that are to be modified. The ' ✓ ' (Check) key is used to weeks in advance are then specified. At the end of
program the Start / Stop times for that day. each week the schedule for the next week is
created by combining the standard week definition
n For the Start / Stop schedule to function correctly and the next defined exception week. The
each start time must have a corresponding stop schedule is then updated as each of the exception
time which occurs later in that day. weeks "shifts down", leaving a new, blank
exception week in the 6th week slot.
n The programmed schedule for a given day can be
cancelled by setting both the Start time and Stop
time to 12:00AM.
n If the start time equals the stop time (with any time
other than 12:00AM), the unit is OFF for that day.
n If the unit is to operate continuously through
several days, the stop time of Day 1 can be set to
11:59PM and the start time of Day 2 can be set to
12:00AM. The unit will not stop but continue to
operate until the stop of Day 2.
160-54-OI-GB0 19
8.1.2 USER SCREEN
The 'USER SCREEN' is used to define User ID's and
passwords for operator/service personnel. The Change
button is used to enable the cursor arrows which are
used to highlight the User ID, Password or User Level
that is to be modified. The ' ✓ ' (Check) key is used to
program the require value.
The Data Display Mode defines the unit system (English
or Metric) used on the display and the System Language
is selected by scrolling through the list of available
languages and pressing the ▲ key.
The selected language will not be displayed
until another screen is selected.
20 160-54-OI-GB0
8.1.3 COMMS SCREEN
The 'COMMS SCREEN' allows the unit ID to be set (for
ISN Network use) and the printer and communications
ports to be set-up (baud rate, data bits, parity and stop
bits).
8.1.4 PRINTER SCREEN
The 'PRINTER SCREEN' allows the printer type to be The Print Report button allows selection and printing of
programmed and automatic printer logging to be a particular report type (status report, setpoints report,
enabled at the start time and interval defined. The time schedule report or sales order report). The Print All
remaining to the next log report will also be displayed. Histories button generates a report of system data at the
time of all stored shutdowns.
160-54-OI-GB0 21
8.1.5 SALES ORDER SCREEN
The 'SALES ORDER SCREEN' displays the sales order
and name plate information for the unit programmed
during manufacturing and commissioning.
8.1.6 OPERATIONS SCREEN
The 'OPERATIONS SCREEN' displays the run time
since the last unit start and enables the control source to
be selected (local, analogue remote, digital remote,
modem remote or ISN remote.
22 160-54-OI-GB0
9 HISTORY SCREEN
The 'HISTORY SCREEN' displays details of the last The Print History button generates a report of a selected
normal shutdown, last safety or cycling shutdown and a shutdown and the Print All Histories button generates a
chronological listing of the last 10 safety or cycling report of system data at the time of all stored shutdowns.
shutdowns.
Trends - (see Section 9.1)
The View Details button displays a sub-screen of
system parameters (see below) at the time of the Custom View- (see Section 9.2)
selected shutdown.
160-54-OI-GB0 23
9.1 TRENDS SCREEN
As many as six selected parameters can be plotted in an There are two types of charts that can be created: ONE
X/Y graph format using the start and stop buttons. SCREEN or CONTINUOUS. When the plotting has
reached the end of the X-Axis, one of the following will
The X-Axis is scaled per the selected Data Collection occur, depending on which is selected:
Interval and displayed in a time of day or elapsed time
format, as selected with the X-axis toggle key. If ONE SCREEN has been selected, the trending stops
and the data is frozen. If CONTINUOUS has been
The Y-Axis is scaled for each parameter per the selected, the oldest data is dropped from the left-hand
selected minimum and maximum value for each side of the graph at the next Data Collection Interval.
parameter. Analogue parameters are scaled in Thereafter, the oldest data is dropped from left-hand
pressure, temperature, volts, amps, hertz or time. side of the graph at each Data Collection Interval.
Digital on/off parameters are scaled as zero (off) and
one (on). If a power failure occurs while the trending is running,
the trending is stopped. Upon restoration of power, the
Only one Y-Axis label is displayed at a time. The Y-Axis last screen of data that was collected will be displayed
Toggle Key is used to toggle the Y-Axis labels through on the trending screen. The START key must be
the different parameters. The Y-Axis label that is being pressed to initiate a new trend screen.
displayed is identified at the top of the graph. All
parameters are displayed simultaneously. For Trend-Setup - (see Section 9.1.1)
identification, each plotted parameter and associated
Y-Axis labelling is colour co-ordinated.
The parameters are sampled at the selected Data
Collection Interval and plotted using 450 data points
across the X-Axis.
If the actual value of the sampled parameter is less than
the Y-Axis label minimum for that parameter, the value
will be plotted at the minimum value. Similarly, if the
actual value is greater than the Y-Axis label maximum
for that parameter, the value will be plotted at the
maximum value.
24 160-54-OI-GB0
9.1.1 TREND SETUP SCREEN
The Slot Nos (see Section 9.1.2) and Select buttons are
used to enter the slot numbers and the minimum and
maximum Y-Axis values of each parameter to be
trended.
The slot number can be obtained from the Common
Slots Screen or Master Slot Number List. Setting this
slot number to zero will disable trending for that
particular Data Point.
There are 20 Y-Axis divisions between the minimum
and maximum values. If a MIN-MAX span is selected
that is not evenly divided by 20, the program will
automatically select the next higher MAX value that
makes the span divisible by 20. The minimum value
must always be set to a value less than the maximum
value and the minimum value should be set to zero (0)
for digital parameters with the maximum value set to one
(1).
160-54-OI-GB0 25
9.1.2 TREND COMMON SLOTS SCREEN
This screen displays the slot numbers of the commonly
monitored parameters.
26 160-54-OI-GB0
9.2 CUSTOM SCREEN(Flash Memory Card Version C.MLM.01.04 or later)
This screen allows up to 10 Service Technician selected
parameters to be displayed for trouble-shooting. These
parameters are selected from a list on the Custom View
Setup Screen. At completion of the service call, the
display can be cleared or the parameters can be left
there for monitoring by operations personnel.
160-54-OI-GB0 27
10 DISPLAY MESSAGES
The 'SYSTEM STATUS' and 'SYSTEM DETAILS' are SYSTEM RUN
displayed at the top of the graphic display.
The unit is running under the condition displayed in the
The 'SYSTEM STATUS' message describes the 'SYSTEM DETAILS'.
operating state of the unit; whether it is stopped,
running, starting or shutting down. SYSTEM COASTDOWN
The 'SYSTEM DETAILS' displays Warning, Cycling, The unit has shutdown and the post-run lubrication is
Safety, Start Inhibit and other messages that provide being performed. On electric motor drive applications,
further details of the 'SYSTEM STATUS' messages. the post-lube duration is 150 seconds.
Messages are displayed in different colours to help The Post-lube duration is set by the
identify them: microprocessor board program switch and
must never be changed by anyone other than
GREEN - Normal operation messages a qualified Service Technician.
YELLOW - Warning messages START INHIBIT
ORANGE - Cycling Shutdown messages The unit is prevented from being started due to the
condition displayed in the 'SYSTEM DETAILS'.
RED - Safety Shutdown messages
VANES CLOSING BEFORE SHUTDOWN
10.1 SYSTEM STATUS Messages
One of the following shutdowns has been initiated.
SYSTEM READY TO START When the Pre-rotation Vanes (PRV) have fully closed,
the unit will shutdown.
The unit is shut down but will start upon receipt of a local
n Leaving Chilled Liquid – Low Temperature
or remote start signal.
n Multi-unit Cycling – Contacts Open
CYCLING SHUTDOWN – AUTO RESTART
n Control Panel – Schedule
The unit is shut down on a 'CYCLING' shutdown. The n System cycling – Contacts Open
cause of the shutdown is still in effect and displayed in
n Remote Stop
the 'SYSTEM DETAILS'. The unit will automatically
restart when the 'CYCLING' condition clears.
SAFETY SHUTDOWN – MANUAL RESTART
The unit is shut down on a 'SAFETY' shutdown. The
cause of the shutdown is still in effect and displayed in
the 'SYSTEM DETAILS'. The unit can be started after
the ' SAFETY' condition clears and t he
'COMPRESSOR' switch has been cycled to the
'STOP-RESET' (O) position.
SYSTEM PRELUBE
A unit start has been initiated and the pre-start
lubrication is being performed. The Pre-lube duration is
either 50 seconds or 180 seconds. The standard
Pre-lube duration is 50 seconds.
The Pre-lube duration is set by t he
microprocessor board program switch and
must never be changed by anyone other than
a qualified Service Technician.
28 160-54-OI-GB0
10.2 SYSTEM DETAILS Messages 10.2.2 Start Inhibit Messages
10.2.1 Run Messages ANTI-RECYCLE XXMIN/SEC
LEAVING CHILLED LIQUID CONTROL The unit is inhibited from starting because the 30-minute
anti-recycle time has not yet elapsed. Time remaining is
The unit is running, controlling the leaving chilled liquid displayed.
to the 'LEAVING CHILLED LIQUID TEMPERATURE
SETPOINT'. There are no system conditions inhibiting VANE MOTOR SWITCH OPEN
this operation.
The unit is inhibited from starting because the PRV are
CURRENT PULLDOWN LIMIT not fully closed.
The pulldown demand limit setpoint timer is in effect and MOTOR CURRENT >15% FLA
the compressor motor current is > the 'PULLDOWN
DEMAND CURRENT LIMIT SETPOINT' value. The The control panel has detected a compressor motor
PRV operation is being inhibited. (Refer to 'MOTOR – current of a magnitude that is >15% of the unit 'FULL
HIGH CURRENT LIMIT' message below). LOAD AMPS' for 10 continuous seconds, while the unit
is shutdown. As long as this condition exists, the oil
MOTOR – HIGH CURRENT LIMIT pump is turned on.
The compressor motor current is > the local or remote Normally this indicates a failure of the motor starter,
'CURRENT LIMIT SETPOINT'. control panel start circuits or motor current feedback
circuits. After motor current is no longer detected, a
The 'CURRENT LIMIT SETPOINT' is programmed over 'SYSTEM COASTDOWN' is performed.
a range of 30 to 100% of the unit Full Load Amps (FLA).
When the motor current increases to the 'INHIBIT The unit can be started after motor current is no longer
OPEN' threshold, the PRV are inhibited from further detected, the 'SYSTEM COASTDOWN' has completed
opening. This prevents a further current rise. If the the 'COMPRESSOR' switch has been cycled to the
current continues to rise to the 'START CLOSE' 'STOP-RESET' (O) position.
threshold, the PRV begin closing until the current falls to
the 'STOP CLOSE' threshold. Automatic PRV operation Models with Mod. 'B' Solid State Starter only
is resumed and this message automatically clears when (Liquid Cooled Solid State Starter LCSSS)
the motor current decreases to the 'ALLOW OPEN'
threshold. LCSSS - HIGH TEMPERATURE PHASE X -STOPPED
The thresholds are different for the various The unit is stopped and the LCSSS logic/trigger board
motor starter applications. To allow field has detected that the temperature of phase A, B, or C
calibration of the CM2 current module and (designated as X in this message) silicon controlled
SSS logic board, special thresholds are rectifier (SCR) module is > 43.3 °C (110 °F). The starter
applied when logged in at SERVICE access cooling pump will run and the unit will be inhibited from
level. starting until the temperature decreases to < 42.8 °C
(109 °F).
An example of current limit is as follows:
n Unit FLA is 100 Amps
n Current Limit Setpoint is 50%
Thresholds:
n 50 Amps – inhibit PRV open
n 52 Amps – PRV begin closing
n 51 Amps – PRV stop closing
n 49 Amps – allow automatic PRV control
160-54-OI-GB0 29
10.2.3 Warning Messages WARNING – SETPOINT OVERRIDE
WARNING – REAL TIME CLOCK FAILURE A blank BRAM (U52 on the microprocessor board) or a
failure of this device was detected during the
During the power-up initialisation process test data is initialisation process that occurs when power is applied
written to a location in the (BRAM) battery backed to the control panel.
memory device (U52 on the microprocessor board).
This data is then read from the BRAM and compared to Due to this failure, any or all of the programmed
the test data. When a difference occurs, it is assumed 'SETPOINTS' could have been corrupted. Therefore, all
the BRAM and real time clock operation is defective and 'SETPOINTS' have been automatically changed to their
this message is displayed. default values.
The BRAM should be replaced by a qualified All Setpoints will have to be re-programmed to
Service Technician. This message their desired values.
automatically clears when the BRAM fault has
been repaired.
WARNING – CONDENSER OR EVAPORATOR XDCR ERROR This message will clear when the 'WARNING RESET'
key is pressed in 'OPERATOR' (or higher) access
The evaporator pressure transducer is indicating a mode.
higher pressure than the condenser pressure
transducer after the unit has been running for 10 WARNING – CONDENSER – HIGH PRESSURE LIMIT
minutes. This indicates failure of the condenser or
evaporator transducer. The condenser pressure exceeds the programmed
'HIGH PRESSURE WARNING SETPOINT'. While this
This message will be displayed until the condition clears condition is in effect, the PRV are inhibited from further
and the 'WARNING RESET' key is pressed in opening.
'OPERATOR' (or higher) access mode.
This message automatically clears and the PRV are
The transducers are not checked in when the permitted to open when the condenser pressure
unit is in the BRINE (GLYCOL) mode. decreases to 34.5 kPa (5 PSIG) below the 'SETPOINT'.
WARNING – EVAPORATOR – LOW PRESSURE LIMIT
The evaporator pressure has decreased to the
WARNING - REFRIGERANT LEVEL OUT OF RANGE 'WARNING THRESHOLD'. This threshold is fixed in
'WATER COOLING' applications (186.2 kPa (27 PSIG).
The output of the condenser refrigerant level sensor is In 'BRINE (GLYCOL) COOLING' applications, the
> 5.1 Vdc. This indicates failure of the level sensor. threshold is a fixed amount (13.8 kPa (2 PSIG) above
the programmable 'SAFETY SHUTDOWN
While this condition exists, the refrigerant variable THRESHOLD'.
orifice is driven to the full open position. This message
automatically clears when the refrigerant level sensor The 'SAFETY SHUTDOWN THRESHOLD' in 'BRINE
output is within range. (GLYCOL) COOLING' applications is determined by the
brine/glycol solution and is fixed York.
WARNING – STANDBY LUBE - LOW OIL PRESSURE
While this condition is in effect, the PRV are inhibited
A minimum of 103.5 kPa (15 PSID) of differential oil from further opening. This message automatically
pressure was not achieved in the first 30 seconds of a clears and the PRV are permitted to open when the
standby lubrication cycle, or the pressure decreased evaporator pressure increases to the 'RESET' value.
below this value during the remainder of the cycle.
This 'RESET' value is fixed in 'WATER COOLING'
This message will be displayed and no further standby applications (193.1 kPa (28 PSIG). In 'BRINE
lubrications will be performed until the 'WARNING (GLYCOL) COOLING' applications, the 'RESET' value
RESET' key is pressed in 'OPERATOR' (or higher) is a fixed amount (20.7 kPa (3 PSIG) above the
access mode. programmable 'SAFETY SHUTDOWN THRESHOLD'.
30 160-54-OI-GB0
Models with Variable Speed Drive (VSD) only Models with Hot Gas By-pass only
WARNING – VANES UNCALIBRATED – FIXED SPEED WARNING – VANES UNCALIBRATED
The compressor motor VSD is operating in 'Fixed The Hot Gas By-pass feature is enabled, but the PRV
Speed' (full speed) mode because the PRV position calibration procedure has not yet been performed.
potentiometer calibration has not been performed.
Models with Analogue I/O Board
WARNING – HARMONIC FILTER – OPERATION INHIBITED
WARNING – EXTERNAL I/O – SERIAL COMMUNICATIONS
The compressor motor VSD harmonic filter has been
inhibited. Serial communications between the microprocessor
board and the optional analogue I/O board has been
Harmonic filter operation should only be interrupted for at least 20 seconds.
modified by a qualified Service technician.
Refer to VSD Service Manual 160.00-M1. 10.2.4 Routine Shutdown Messages
REMOTE STOP
WARNING – HARMONIC FILTER – DATA LOSS A shutdown command has been received from a remote
device. 'REMOTE STOP' commands can be received in
Communications between the harmonic filter logic 'DIGITAL REMOTE MODE' via I/O board TB4-7/8 or in
board and the compressor motor VSD logic board or the 'ISN (Integrated Systems Network) REMOTE MODE'
Adaptive Capacity Control (ACC) board is not occurring. via the General Protocol Interface Card (GPIC) serial
communications.
While this condition exists, all filter related parameters
are displayed as X’s. This message automatically clears If the unit is running when this occurs, the PRV are
when communications are restored. driven fully closed prior to shutting down the unit.
WARNING – HARMONIC FILTER–INPUT FREQUENCY LOCAL STOP
RANGE
A local shutdown command has been received by
The power line frequency detected by the compressor
placing the unit 'START-RUN-STOP/RESET' switch in
motor VSD harmonic filter is outside the range of 49 to
the STOP (O) position.
51 Hz (50 Hz units) or 58 to 62 Hz (60 Hz units).
PLACE COMPRESSOR SWITCH IN RUN POSITION
While this condition exists, all filter related parameters
are displayed as X’s. This message automatically clears The control panel is in either 'DIGITAL REMOTE MODE'
when the line frequency is within range. or 'ISN REMOTE MODE'. The 'OPERATOR' is
requested to place the 'COMPRESSOR' switch in the
'RUN' position. The control panel will not accept a
r emot e ' ST AR T / ST O P' command unl ess t h e
'COMPRESSOR' switch is in the 'RUN' position.
160-54-OI-GB0 31
10.3 Cycling Shutdown Messages CONTROL PANEL – POWER FAILURE
MULTIUNIT CYCLING – CONTACTS OPEN A control power failure has occurred. If the power failure
occurred while the unit was running, it will automatically
The 'MULTIUNIT CYCLING' contacts connected to I/O restart when power is restored.
board TB4-9, have opened to initiate a cycling
shutdown. However, if the power failure duration was < the duration
of the 'COASTDOWN' period (150 seconds) when
If the unit is running when this occurs, the PRV are power is restored, the remainder of the 'COASTDOWN'
driven fully closed prior to shutting down the unit. The will be performed, prior to the unit starting.
unit will automatically restart when the contacts close.
This message can indicate a 'CYCLING' in orange
SYSTEM CYCLING – CONTACTS OPEN
characters (auto-restart after power failure) or 'SAFETY'
in red characters (manual restart after power failure)
The 'SYSTEM CYCLING' contacts connected to I/O shutdown, depending upon control panel configuration.
board TB4-13, have opened to initiate a cycling
shutdown.
T he cont r ol panel i s conf i gu r e d f o r
If the unit is running when this occurs, the PRV are auto-restart or manual restart after power
driven fully closed prior to shutting down the unit. The failure by a qualified Service Technician.
unit will automatically restart when the contacts close.
OIL – LOW TEMPERATURE DIFFERENTIAL LEAVING CHILLED LIQUID – LOW TEMPERATURE
The unit is prevented from starting because for one of The leaving chilled liquid temperature has decreased to
the following reasons. The unit will automatically restart the programmed 'SHUTDOWN TEMPERATURE
when the conditions have been satisfied. SETPOINT'. If the unit is running when this occurs, the
PRV are driven fully closed prior to shutting down the
n The unit has been shut down for < 30 minutes and unit.
the oil temperature minus the condenser saturation
temperature is < -1.1 °C (30 °F). The unit will automatically restart when the temperature
i ncr eases t o t he pr ogr ammed ' R E S T A RT
OR TEMPERATURE SETPOINT'.
n The unit has been shut down for > 30 minutes and LEAVING CHILLED LIQUID – FLOW SWITCH OPEN
the oil temperature minus the condenser saturation
temperature is < 4.4 °C (40 °F). The chilled liquid flow switch has remained open for 2
seconds while the unit was running or failed to close
OR during the 'SYSTEM PRE-LUBE' period. The unit will
automatically restart when the flow switch closes.
n Following a Power failure, upon restoration of
power, the oil temperature minus the condenser CONDENSER – FLOW SWITCH OPEN
saturation temperature is < 4.4 °C (40 °F).
The condenser water flow switch has remained open for
OIL – LOW TEMPERATURE 2 seconds while the unit was running. This check is
by-passed for the first 30 seconds of 'SYSTEM RUN'.
The oil temperature has decreased to < 12.8 °C (55 °F). The unit will automatically restart when the flow switch
The unit will automatically restart when the temperature closes.
increases to > 12.8 °C (55 °F) and is greater than the
condenser saturated temperature by -1.1 °C (30 °F) or
4.4 °C (40 °F), refer to 'OIL – LOW TEMPERATURE
DIFFERENTIAL' message description above.
32 160-54-OI-GB0
MOTOR CONTROLLER – CONTACTS OPEN CONTROL PANEL – SCHEDULE
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