Rockwell Automation 1902 Syncpro II - Manual (Page 53)

Rockwell Automation Publication 1902-IN001B-EN-E - April 2013 55
Chapter
7
Troubleshooting
Last Trip Table To aid in troubleshooting, the unit stores the last 50 recorded faults. These can be
accessed by viewing the contents of the alarm history.
Table 5 - Troubleshooting Guide
Problem or Trip
Indicated Indication of the following conditions Possible Solutions
Pullout trip (power factor)
[PULL OUT TRIP
(POWER FACTOR)] • Motor overloaded
• Loss of DC excitation
• Static exciter DC current level set
too low
• Lessen the motor loading and/or
overload
• Repair static exciter
• Increase current setting on static
exciter if lagging
• Decrease current setting on static
exciter if leading
• Mask leading power factor trip if
application/ motor is designed for it
Squirrel-cage
Protection Trip
[SQUIRREL-CAGE
PROTECTION TRIP] • Motor overloaded at start • Remove or lessen load for start
Incomplete Start Sequence
Time Exceeded
[INCOMPLETE START
SEQUENCE TRIP] • Motor overloaded at start
• Field contactor or FC pilot relay coil
failure
• Remove or lessen load for start
• Replace coil(s)
No Transducer Input
[POWER FACTOR XDCR –
NO INPUTS] • The transducer is putting out less than
12 mA when the motor is off (should
be 12 mA)
• Check the wiring for the voltage
sensing on the transducer board.
• Replace phase angle transducer board
if necessary.
• Replace analog card in SyncPro II
chassis
CT Open/Shorted
[POWER FACTOR XDCR –
CT OPEN/SHORT] • The CT is either open or shorted. • Check the wiring between the CT and
the transducer board.
• Replace the CT if necessary.
CT Reversed
[POWER FACTOR XDCR–
CT REVERSED] • The CT is incorrectly wired to the
transducer board.
• Reverse the leads of the CT at the
transducer board.
No Signal @ SLC
[POWER FACTOR XDCR–
NO SIGNAL AT PLC] • There is no signal at the PLC analog
card from the PF transducer board.
• Check the wiring between the
transducer board and the PLC
analog card.
• Ensure that there is power to the
transducer board.
• Replace the PLC analog card or
transducer board as required.
Transducer Problem
[POWER FACTOR XDCR
CIRCUIT FAULT] • The transducer is behaving
unpredictably.
• This is an all-encompassing fault and
could include anything from the CT, the
transducer board, or the PLC analog card