Troubleshooting 3-23
7000-TD002A-EN-P – September 2007
FAULT
MESSAGE
FAULT
CODE
DESCRIPTION RECOMMENDED ACTIONS
Slave1 VoltUnbal 121 The level of unbalance in the input voltage
of the Slave 1 Bridge displayed in Slave1
VoltUnbal (P611) has exceeded the value of
the trip settings in (P271). This fault is valid
only for 18-pulse rectifier.
Slave2 VoltUnbal 122 The level of unbalance in the input voltage
of the Slave 2 Bridge displayed in Slave2
VoltUnbal (P610) has exceeded the value of
the trip settings in (P271). This fault is valid
only for 18-pulse rectifier.
– CHECK TSN FUSING
– Verify the VSB connections and tap
settings, and check resistance of VSB
board – Megger board to confirm
integrity
– Check actual voltage values on the
Operator Interface terminal for each
bridge and the total line voltage
– Check for possible source voltage supply
problems
– Use Multimeter and Oscilloscope to
check voltages on the drive voltage test
points
Speed Cmd Loss 23
The drive has lost communication with the
device responsible for providing the speed
command to the drive. This has been set to
annunciate as a fault. The drive will
configure the Speed Command Loss as a
fault when the associated bit in DPI Loss
Mask (P175) is set to a 1. Setting the bit to
0 will cause the drive to indicate a warning
and run at the last commanded speed.
The fault could be the DPI adapter or the 4-
20mA signal wired to the analog input (IFM
board). Ensure that all connections are
secure, device is powered and operating
correctly.
– Ensure that the communication device is
powered
– Verify the light status and ensure the
communicating device is operating properly
– Verify the customer network is properly
communicated with the device
– Check ACB LED status
– Cycle control power to the drive
– Change the Adapter and/or ACB if all
attempts to restore communication fail
– Ensure that all connections at IFM are
secure, device is powered and operating
correctly.
Sync VSB 460 This fault indicates that the voltage sensing
board associated with the synchronous
transfer voltages is not plugged in.
– Check connector J25 at ACB
– Verify the ribbon cable connection from
Sync VSB to ACB board.
Sync Xfer Failure 162 A Synchronous Transfer was not completed
in the time specified in Synchronous
Transfer Time (P230) and the drive has
faulted. This fault will only occur if the
parameter Sync Xfer Option is configured as
Enable Fault. If the parameter is set as
Enable Warn, the drive will go back to last
speed command and issue a warning.
– Instability at Synchronous Speed - Check
for stability of the synchronous transfer
process/ speed regulator
– Motor can not reach Synchronous Speed
due to heavy load
– Check load conditions for torque limit or
low alpha line (low line voltage)
– Consult factory for review of
synchronous transfer parameters
– This fault indicates that the drive failed to
synchronize the motor to the bypass
within the specified time. Adjust the Sync
Reg Gain (P225), Sync Error Max
(P228), Spd Reg Bandwidth (P81) for a
smooth transfer.
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