Rockwell Automation 20B PowerFlex 700 AC Drives Vector Control (v4.001 and up) User Manual
Page 89
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
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
.
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] (
).
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
for a description of fault types.
Fault
No
.
Ty
pe
(1)
Description
Action