ABB ACS880 Series Firmware Manual page 495

Code
Fault
(hex)
5091 Safe torque off
Programmable fault:
STO indication run/stop
5092 PU logic error
5093 Rating ID mismatch
5094 Measurement circuit
temperature
Cause
Safe torque off function is
active, i.e. safety circuit
31.22
signal(s) connected to
connector XSTO is broken
during start or run.
Power unit memory has
cleared.
The hardware of the drive does
not match the information
stored in the memory unit. This
may occur eg. after a firmware
update or memory unit
replacement.
Problem with internal
temperature measurement of
the drive.
Fault tracing 495
What to do
Check safe torque off circuit connections.
For more information, see appropriate
drive hardware manual and description of
parameter 31.22 STO indication run/stop
(page 258).
Cycle the power to the drive. If the
control unit is externally powered, also
reboot the control unit (using parameter
96.08 Control board boot) or by cycling
its power. If the problem persists, contact
your local ABB representative.
Cycle the power to the drive.
Check the auxiliary code. The auxiliary
code categories are as follows:
1 = PU and CU ratings not the same.
Rating ID has changed.
2 = Parallel connection rating ID has
changed.
3 = PU types not the same in all power
units.
4 = Parallel connection rating ID is active
in a single power unit setup.
5 = It is not possible to implement the
selected rating with the current PUs.
6 = PU rating ID is 0.
7 = Reading PU rating ID or PU type
failed on PU connection.
8 = PU not supported (illegal rating ID).
With parallel connection faults, the format
of the auxiliary code is 0X0Y. "Y"
indicates the auxiliary code category, "X"
indicates the first faulty PU channel in
hexadecimal (1...C).
See A5EA Measurement circuit
temperature (page 476).