Troubleshooting
139
Name
Description
Possible Causes & Corrective Action
Bridge Fault
The integrated power module is
sensing an overcurrent or
overtemperature condition
(only B and C-cubes)
Overcurrent Problem
➲
Check for a possible short between the motor
windings.
➲
Verify dynamic brake resistor size (could be
too small)
Overtemperature Problem
➲
Reduce Ambient Temperature
➲
Clean heat sink
➲
Check for cooling fan failure
The drive may need to be replaced, if no other
problem found.
Charge Fault
The DC bus voltage has not stabilized
above the voltage fault level within 2
seconds or the charge contactor has
not closed after charging.
OR
The DC bus voltage is below the UV
Fault level as defined by the INPUT L-
L VOLTS (A4) and UV FAULT LEVEL
(A4) parameters
DC Choke Connection
➲
Check that the DC choke link is present or if
using DC choke, check DC choke
connections
Low Input Voltage
➲
Check INPUT L-L VOLTS (A4) and UV
FAULT LEVEL (A4) parameters
➲
Disconnect Dynamic Braking resistor and re-
try.
➲
Verify proper input voltage and increase, if
necessary, the input AC voltage within the
proper range
➲
Check for a missing input phase
➲
Check power line disturbances due to starting
of other equipment
Drive Accurately Reading the Dc Bus
➲
Measure the dc bus with a meter
➲
Compare that with the value on the digital
operator, DC BUS VOLTAGE (D2)
Drive may need to be replaced
Comm Fault
The drive is being operated by serial
communications and one of the
following has occurred:
•
Communication time-out – if the
serial run bit is set and the drive
does not receive a run-time
message for 40 msec
•
Bad message checksum – drive
has detected three consecutive
bad message checksums
Bad Serial Connection
➲
Remove and re-seat the RS-422 serial cable
➲
Check car controller serial driver board
➲
Check the serial cable connected to the
drive’s RS-422 port
➲
Also, the drive’s control board may need to
be replaced.
Comm Fault
Invalid
Checksum
(operator)
The operator received four
consecutive invalid messages.
Noise or Bad Connector Connection
➲
Remove and re-seat the operator in its
cradle.
➲
If re-seating of the operator does not work,
the operator or the drive’s control board may
need to be replaced.
Comm Fault
No Drv
Handshake
(operator)
The operator lost communications with
the drive’s control board.
Bad Connector Connection
➲
Remove and re-seat the operator in its
cradle.
➲
If re-seating of the operator does not work,
the operator or the drive’s control board may
need to be replaced.