Rockwell Automation 1901 SyncPro - Manual (Page 46)

6-2 Monitoring
1901-UM020C-EN-P – June 2013
Faults (cont.) Fault Detection and Diagnostics (cont.)
Upon starting the motor, additional diagnostics are performed.
Any of these conditions will abort the start. Diagnostics
performed are:
a) Lack of either pulse signal from the slip frequency generator.
b) Lack of field voltage or field current (if applicable).
c) Power Factor Transducer Circuit Fault.
Power Factor Circuit Fault
This fault covers a number of possibilities such as reversed leads at
the CT, shorted CT input, loss of control power to transducer or a
faulted transducer.
An incomplete start sequence timer (setpoint parameter) is utilized
to abort the starting if abnormal periods are encountered. This
time is set independent of the squirrel-cage protection times.
While the motor is running, the motor is protected by monitoring
fault conditions for:
a) Loss of synchronization. Minimum power factor lag is
selectable, as is the duration of running.
b) Loss of feedback from the field contactor.
c) Loss of the EQUIPMENT SHUTDOWN caused by an external
fault.
In all cases, faults are displayed on the DTAM and can be reset via
the RESET push button.