User Manual
Rockwell Automation Publication 20B-UM002G-EN-P - July 2014 89
Troubleshooting Chapter 2
Pwr Brd Chksum2 105 2 The checksum read from the board does
not match the checksum calculated.
1. Cycle power to the drive.
2. If problem persists, replace drive.
Replaced MCB-PB 107 2 Main Control Board was replaced and
parameters were not programmed.
1. Restore defaults.
2. Reprogram parameters.
See Manual 28 Encoderless TorqProve has been
enabled but user has not read and
understood application concerns of
encoderless operation.
Read the “Attention” on page 112
relating
to the use of TorqProve with no encoder.
Shear Pin 63 3 Programmed [Current Lmt Val] has
been exceeded. Enable/Disable with
[Fault Config 1] on page 52
.
Check load requirements and [Current Lmt
Val] setting.
Software Fault 88 Microprocessor handshake error. Replace Main Control Board.
Software Fault 89 Microprocessor handshake error. Replace Main Control Board.
SW OverCurrent 36 1 Drive output current has exceeded the
1ms current rating. This rating is
greater than the 3 second current rating
and less than the hardware overcurrent
fault level. It is typically 200- 250% of
the drive continuous rating.
Check for excess load, improper DC boost
setting. DC brake volts set too high.
TorqPrv Spd Band 20 Difference between [Commanded
Speed] and [Encoder Speed] has
exceeded the level set in [Spd Dev
Band] for a time period greater than
[Spd Band Integrat].
1. Check wiring between drive and motor.
2. Check release of mechanical brake.
Trnsistr OvrTemp 9 1 Output transistors have exceeded their
maximum operating temperature.
1. Verify that maximum ambient
temperature has not been exceeded.
2. Check fan.
3. Check for excess load.
UnderVoltage 4 1
3
DC bus voltage fell below the minimum
value of 407V DC at 400/480V input or
204V DC at 200/240V input. Enable/
Disable with [Fault Config 1] (page 52
).
Monitor the incoming AC line for low
voltage or power interruption.
UserSet1 Chksum 101 2 The checksum read from the user set
does not match the checksum
calculated.
Re-save user set.
UserSet2 Chksum 102 2
UserSet3 Chksum 103 2
(1) See page 83 for a description of fault types.
Fault
No.
Type
(1)
Description Action