| Document type | Service Information Letter |
|---|---|
| Document number | SI0210 |
| Equipment | YK Centrifugal Chiller |
| Brand | YORK |
| File size | 0.3 MB |
Fault codes in this document
Medium Voltage Variable Speed Drive
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| INVALID | The MV VSD Model, shown on the MV VSD Screen in the data box labeled “MV VSD Model”, cannot be resolved. | The model number derived from the Motor Rated Voltage (Modbus Address 40012) and the Programmed Drive Current (Modbus Address 40013) results in a model that is not defined in the lookup table. | The chiller will not be allowed to run while this is displayed. | 2 |
| INVALID | Invalid Motor Voltage Rating received from the MV VSD; “INVALID” replaces the voltage reading in the “Motor Voltage Rating” display on the MV VSD Screen. | An invalid “Motor Voltage Rating” value was received from the MV VSD. | The chiller will not be allowed to run while this is displayed. | 2 |
| INVALID | Invalid rated output frequency received from the MV VSD; “INVALID” is shown in the “Output Frequency Rating” data box on the MV VSD Screen. | The rated output frequency (Modbus Address 40033) received from the MV VSD is not 50Hz or 60Hz. | In this case the “Motor Voltage Rating” determines the maximum frequency: 2300 or 4160V = 60Hz; 3300V = 50Hz. | 2 |
| VSD – Low Frequency Detected | Safety fault on the variable speed drive output frequency. | After a 20 second bypass after entering “System Run”, the frequency is below 1Hz less than the minimum allowed running frequency for 25 consecutive seconds. (Software enhancement: the previous requirement to reach the minimum frequency before the fault can be detected has been eliminated, and 20 and 25 second timers have been added.) | The fault will shutdown the chiller. | 2 |
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Manufacturer document, published here as reference material for equipment we supply. The original lives at docs.johnsoncontrols.com. The rights holder may ask us to take it down — we will.