| Вид документа | Бюлетень виробу |
|---|---|
| Виробник | JCI |
| Код документа | r310a-series-current-sensing-switch |
| Група обладнання | R310 Current Sensing Switch |
| Сторінок | 8 |
| Мова документа | англійська |
| Розмір файлу | 0.2 МБ |
Текст документа
FANs 121, 125
Relays and Contactors Section R
Product/Technical Bulletin R310A
Issue Date 1018
R310A Series Current Sensing Switch
The R310A Series Current Sensing Switch detects
current flow in a circuit without being wired to that
circuit. It may be used in any application where current
detection is required.
The R310A switch replaces the R10A Current Sensing
Relay and is typically used with Johnson Controls®
time delay oil failure cutout controls such as the P28,
P45, and P445 lube oil controls. The R310A is used to
reduce nuisance lube oil protection lockout caused by
compressor motor overloads in applications where
lockout due to overload cycling is not desirable.
The R310A switch is molded in a high dielectric
material, which permits mounting inside a motor starter
or contactor enclosure. Figure 1: R310A Series Current Sensing Switch
Features and benefits
Small size Allows mounting in small enclosure
Solid-state switch Contains no moving parts to fail
Low amperage Allows continuous sensing of current for most
switch activation small equipment circuit loads
200 ampere maximum Allows continuous sensing of current to heavy
sensing capacity duty equipment
Large 11/16 in. (18 mm) Accepts large diameter wire sizes and
diameter sensor hole multiple coils of smaller diameter wire sizes
© 2018 Johnson Controls 1
Part No. 24-7664-1652, Rev. B www.penncontrols.com
Code No. LIT-121536
Vendor Control No. Z102106-0C
A pplication
IMPORTANT: The R310A Current Sensing Johnson Controls/PENN® oil failure cutout controls
Switch is designed to control incorporate a time delay heater (P28 and P45 lube oil
equipment under normal controls) or an electronic timer (P445 electronic lube
operating conditions. Where oil control), which must be de-energized when the
failure or malfunction of the compressor shuts down due to the compressor motor
switch could lead to an abnormal overload protection device. If the timing circuit in the oil
operating condition that could failure cutout control is not de-energized, the control
cause personal injury or damage locks out and gives false indication of lube oil
to the equipment or other problems.
property, other devices (limit or In a typical compressor application, the 3-phase motor
safety controls) or systems leads (T1, T2, T3) are connected to the power source
(alarm or supervisory systems) through a contactor or motor starter. During normal
intended to warn of or protect operation, the contactor is closed on demand for
against failure or malfunction of cooling and opened when the cooling demand is met.
the switch must be incorporated
into and maintained as part of the If the compressor motor overheats and an internal
control system. thermal overload circuit opens, the compressor stops
running, but the contactor may remain closed.
Compressor shutdown causes the oil pressure to drop,
and the heater (P28 or P45 lube oil control) or the
IMPORTANT: The R310A Current Sensing timer (P445 electronic lube oil control) is energized,
Switch is not intended to detect which results in a nuisance lockout and false indication
breakage of belts, shafts, or fan of a lube oil problem.
blades.
The R310A switch avoids these nuisance lockouts by
The R310A switch is designed to sense current in a sensing the lack of current flow to the motor.
conductor that passes through its open core and close Regardless of the reason for motor shutdown, the lube
an electronic switch if the current through the oil control time delay circuit is de-energized when the
conductor exceeds the switch’s minimum amperage current flow in the motor supply line drops below the
rating. See Specifications. minimum amperage rating. See Specifications.
Typical applications are:
switching a pilot circuit O peration
interlocking compressor operation with lube oil One of the motor supply leads is passed through the
protection devices opening in the R310A switch. A current flow of more
detecting compressor operation on Heating, than 0.5 ampere (R310AD-1) or 0.75 ampere
Ventilating, Air Conditioning, or Refrigeration (R310AE-2) in the motor supply lead closes the
(HVAC/R) equipment electronic switch. If the R310A switch is used with a
lube oil control, this action energizes the lube oil
detecting the presence of electrical loads control’s heater (P28 or P45 lube oil control) or timer
(P445 electronic lube oil control).
detecting on/off status of process motors
The R310A Series Current Sensing Switch is available
in two models. The R310AD-1 switch is used to switch
low-voltage control circuits, such as the P445
Electronic Lube Oil Control delay timer circuit. The
R310AE-2 switch is used to switch high-voltage control
circuits, such as the P28 and P45 Electromechanical
Lube Oil Controls time delay heater circuit.
2 R—R310A Series Current Sensing Switch Product/Technical Bulletin
1-13/16 The sensor may be located at any point on the
(46) 3/16
(5) conductor between the motor starter and the motor.
3/16 Use the following procedure to install the R310A
(5) switch:
1-1/8
7/8 (28)
(23)
1. Pass the conductor through the center hole in the
R310A switch.
2-1/4 2. Connect the conductor to the terminals on the
(57)
motor starter or motor.
3. Fasten the mounting bracket (included) to a flat
11/16
1-13/16 (18) surface using the screws provided.
(46)
4. Snap the rounded end of the R310A switch into
the mounting bracket.
2-3/4
(70) 5. If an electromechanical lube oil control is used,
connect the R310A switch output to the heater
timer circuit. (The R310A switch terminals are not
polarity sensitive.) If the P445 control is used,
connect the R310A switch output to terminals
W1 and W2 on the P445 control.
7/8
Low amperage applications
(23) 1
(26)
Applications where the sensed current is less than the
switch’s minimum rating require that the conductor to
be wrapped through the center hole and around the
sensor body to produce multiple loops. The use of
Figure 2: R310A Series Switch and mounting multiple loops creates a magnetic field sufficient to
bracket dimensions, in. (mm) close the electronic switch. In this case, the number of
times the wire must pass through the center hole can
be determined using a simple formula:
I nstallation Formula for R310AD-1 Switch
! N = 0.5 / Current
WARNING: Risk of Electrical Shock.
Disconnect power supply before Formula for R310AE-2 Switch
making electrical connections to
avoid possible electrical shock or N = 0.75 / Current
equipment damage. Round “N” up to the nearest whole number, if needed.
Example
IMPORTANT: Verify that the power conductor
to be monitored is disconnected If the model used is an R310AD-1 switch and the
from the power source before current is 0.2A, then the equation becomes:
beginning installation. Failure to N = 0.5 / 0.2 = 2.5
follow this precaution may result
in undesired activation of the Rounded up, N = 3 and the wire needs to pass
switch during the installation through the center hole three times. (See Figure 3.)
process.
Avoid wire strain on motor supply
lead when locating and fastening
the R310A switch.
R—R310A Series Current Sensing Switch Product/Technical Bulletin 3
Additional controls
in this line only.
P45 or P28 240V 3-phase
Lube Oil Control
L1 L2 L3
Operating
Control
240 R310AE-2
Switch
2
T1 T2 T3
M
Figure 3: Multiple wiring turns for low
amperage applications L
Motor
120
High amperage applications
Applications where the sensed current may exceed Figure 4: Typical high-voltage field wiring
200 A require the use of an appropriately sized
external current transformer. Install the external 240V 3-phase
current transformer on the conductor per the L1 L2 L3
P445 Electronic Lube Oil Control
manufacturer’s specifications. Run the current
transformer’s secondary wire through the R310A Compressor Contactor
switch and connect the current transformer’s
secondary wires per the manufacturer’s specifications
Optional Alarm
and instructions. Connection
W iring M1 NOA CMA NCA
Low Pressure
Control
Figure 4 shows typical high-voltage field wiring on a 240 120 L2 M2
240 VAC system with a P28 or a P45 lube oil control
and an R310AE-2 switch. Figure 5 shows typical
low-voltage field wiring on a 240 VAC system with a W1 W2
High Pressure
P445 electronic lube oil control and an R310AD-1 Control
switch. In both illustrations, the conductor is passed
through the opening in the R310A switch.
T1 T2 T3
R39 Remove resistor R39 when
using the R310AD relay.
Motor
Figure 5: Typical low-voltage field wiring
4 R—R310A Series Current Sensing Switch Product/Technical Bulletin
T esting R epairs and replacement
To test an R310A Current Sensing Switch for Field repairs must not be made. For a replacement
operation, use the following procedure: current sensing switch, contact the nearest
Johnson Controls/PENN distributor.
1. Ensure that the R310A switch is connected to a
load and power, but that no current is flowing
through the conductor that passes through the
R310A switch. O rdering information
2. Use a voltmeter to measure the AC or DC voltage Table 1: Ordering information
across the terminals of the R310A switch. The
Product code number Description
meter should read the same as the power.
3. Apply current to the conductor that passes through Current Sensing Switch
the center hole of the R310A switch. R310AD-1C voltage switching rating:
0 V-30 V AC/DC
4. Use a voltmeter to measure the AC or DC voltage
across the terminals of the R310A switch. The Current Sensing Switch
meter should read minimal or no voltage. R310AE-2C voltage switching rating:
0 V-250 V AC/DC
5. Compare the readings. If the first reading detected
a voltage equal to the power and the second
reading detected minimal or no voltage, then the
R310A switch is operating properly. If any other
result was found, the R310A switch is not
operating properly and should be replaced.
R—R310A Series Current Sensing Switch Product/Technical Bulletin 5
Notes
6 R—R310A Series Current Sensing Switch Product/Technical Bulletin
Notes
R—R310A Series Current Sensing Switch Product/Technical Bulletin 7
S pecifications
Product R310A Series Current Sensing Switch
Switch action Solid state, normally off
Current sensing range R310AD-1 Switch: 0.5-200 amperes
R310AE-2 Switch: 0.75-200 amperes
Switch threshold R310AD-1 Switch: 0.5 ampere
R310AE-2 Switch: 0.75 ampere
Sensor supply voltage Induced from monitored conductor, isolation 600 VAC RMS
Switching capacity R310AD-1 Switch: 0.1A @ 30 VAC/DC
(General purpose) R310AE-2 Switch: 0.5A @ 250 VAC/DC
Output polarity Non-polarity sensitive output
Enclosure NEMA 1
Agency listings UL File, E190934; CCN’s NRNT (US) and NRNT7 (Canada)
Ambient operating R310AD-1 Switch: 5°F to 140°F (-15°C to 60°C); 0-95% RH, non-condensing
conditions R310AE-2 Switch: 5°F to 122°F (-15°C to 50°C); 0-95% RH, non-condensing
Ambient storage -40°F to 158°F (-40°C to 70°C); 0-95% RH
conditions
Dimensions (H x W x D) 2.34 x 1.85 x 0.875 in. (59 x 46 x 22 mm)
Sensor hole size 0.70 in. (17 mm) diameter
Shipping weight 0.60 lb (0.27 kg)
The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these
specifications, consult Johnson Controls/PENN Application Engineering at (800) 275-5676. Johnson Controls shall not be liable for damages
resulting from misapplication or misuse of its products.
www.penncontrols.com
® Johnson Controls and PENN are registered trademarks of Johnson Controls in the
United States of America and/or other countries. All other trademarks used herein are the property
of their respective owners. © Copyright 2018 by Johnson Controls. All rights reserved.
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