ATS01: What faults will the R1A-R1C relay indicate?
All model and serial numbers
ATS01 model numbers that end in LT/LU/QN/RT have a relay contact R1A-R1C. It is not really a fault relay. It is opened when the motor is stopped, and it is closed when the motor is running. Furthermore, the ATS01 monitors for unsynchronized current (in case of loss of power or no load current) and will open the relay indicating a fault. Even very low current levels can result in fault because the thyristors require a minimum current to work properly.