Rockwell Automation 1902 Syncpro II - Manual (Page 52)

54 Rockwell Automation Publication 1902-IN001B-EN-E - April 2013
Chapter 6 Monitoring
Faults Fault Detection and Diagnostics
The product incorporates numerous fault detections in addition to the starting
squirrel-cage protection and running pullout protection previously mentioned.
Prior to starting the motor, diagnostics are performed that detect the:
a. Lack of 24V supply to the slip frequency generator.
b. Reversed Power Factor Leads between the SyncPro II and tansducer.
c. Lack of the EQUIPMENT SHUTDOWN (external fault) signal.
d. Loss of Setpoint Data.
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 7) is utilized to abort the starting if
abnormal long 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 PanelView 300 and can be reset via the
RESET push button.