Rockwell Automation 1902 Syncpro II - Manual (Page 54)

56 Rockwell Automation Publication 1902-IN001B-EN-E - April 2013
Chapter 7 Troubleshooting
The phase angle transducer, as wired from the factory, is set up for the customer
to run his wiring with and ABC line orientation. If this was not observed, the
user has two options. First, the line cables can be moved (switching any two
incoming lines will do) so that ABC now exists (BCA or CAB are also
acceptable), OR the current transformer leads to the transducer can be swapped
at the transducer.
Pulse Board 24 V Failure
[PULSE BOARD 24 VDC
FAILURE] • Connection has not been made
between the analog/digital pulse
board and the SyncPro II DC input card
or from the discharge resistor to the
same A/D pulse board.
• 24VDC power supply has had a failure
• Check the connections at the A/D
pulse board.
• Check fuse in power supply. Check for
24 V at power supply. Replace power
supply if necessary.
• Replace A/D pulse board.
Field Voltage Loss
[FIELD VOLTAGE LOSS] • The static exciter is not actively
producing DC or the FVR relay coil has
failed.
• Wrong polarity on FVR coil.
• Incorrect voltage rating of FVR coil.
• Exciter Enable (EE) relay did not pick up.
• Service the static exciter or repair the
FVR relay.
• AC Voltage to the bridge absent
• 10 VDC on Op Amp Board Absent
• Check polarity on FVR coil.
• Check voltage rating of FVR coil.
• Verify the control circuit.
Field Current Loss
[FIELD CURRENT LOSS] • The current relay which monitors the
motor field current is not providing an
energized contact to verify that the
static is functional.
• Check both the field current relay and
the static exciter for possible failures.
No Field Coil Feedback
[NO FIELD COIL FEEDBACK] • The SyncPro II has requested the field
contactor to energize but the feedback
contact from this contactor is not
showing as closed.
• The field contactor coil has failed. Replace
the coil. The connection to the FC
auxiliary has not been made. Check
the wiring.
• The FC auxiliary contact has failed.
Replace the contact.
Reversed PF @ SyncPro II
[REVERSED PF AT PLC] • The connections from the PF transducer
to the analog card have been
accidentally reversed.
• Switch the positive and negative
transducer output leads at the analog
card.
External Hardware Fault
[EXTERNAL HARDWARE
FAULT] • An external device to the SyncPro II is
not functioning as expected.
• Check external devices.
Pulse Board Positive and
Negative Pulse Missing
[PULSE BOARD POSITIVE
MISSING]
[PULSE BOARD NEGATIVE
MISSING] • The SyncPro II is not seeing a pulse
train being supplied from the A/D
board at the time of starting.
• The R F 1/R F 2 resistor selection is not
correct. The signal is too weak to
provide the necessary pulse train
• Pulse train would be lost if either the A/D
card failed, the RF/RF2 selection is
incorrect, or if the connection is not made
from the A/D board to the SyncPro II.
• Review the R F 1/R F 2 setup parameter
and verify the procedure performed
(see ‘Commissioning’, item 4, on page
4-7).
Contactor Feedback Lost
[NO MOTOR CONTACTOR
FEEDBACK] • The SyncPro II monitors the status of
the synchronous motor stator contactor
while running.
• The male/female connector of the
vacuum contactor is not matched
properly.
• The PLC I/O card slot 2 input 8 is faulty.
• The main contactor coil has failed.
Replace the coil. The connection of the
M auxiliary contact has not been made.
Check the wiring.
• The contact has failed. Replace.
• Ensure the connector is matched
properly.
• Replace the I/O board.
• Check the fuse.
Halt Synch Relay • The program/remote/run switch on the
PLC processor may be in program
mode.
• Turn the key switch to the «RUN» mode
position.
Table 5 - Troubleshooting Guide (Continued)
Problem or Trip
Indicated Indication of the following conditions Possible Solutions