526 Fault tracing
5681 PU communication The way the control unit is
powered does not correspond
to parameter setting.
Check setting of 95.04 Control board
supply.
Communication errors
detected between the drive
control unit and the power unit.
Check the connection between the
control unit and the power unit.
Check the auxiliary code (format XXXY
YYZZ). With parallel-connected modules,
“Y YY” specifies the affected BCU control
unit channel (0: broadcast). “ZZ”
specifies the error source (1: Transmitter
side [link error], 2: Transmitter side [no
communication], 3: Receiver side [link
error], 4: Receiver side [no
communication], 5: Transmitter FIFO
error [see “XXX”], 6: Module [xINT board]
not found, 7: BAMU board not found).
“XXX” specifies the transmitter FIFO
error code (1: Internal error [invalid call
parameter], 2: Internal error
[configuration not supported],
3: Transmission buffer full).
5682 Power unit lost Connection between the drive
control unit and the power unit
is lost.
Check the connection between the
control unit and the power unit.
5690 PU communication
internal
Internal communication error. Contact your local ABB representative.
5691 Measurement circuit
ADC
Measurement circuit fault. If the control unit is externally powered,
check the setting of parameter 95.04
Control board supply.
If the problem persists, contact your local
ABB representative, quoting the auxiliary
code.
5692 PU board powerfail Power unit power supply
failure.
Check the auxiliary code (format
ZZZY YYXX). “YY Y” specifies the
affected inverter module (0…C, always 0
for ZCU control units). “XX” specifies the
affected power supply (1: Power supply
1, 2: Power supply 2, 3: both supplies).
5693 Measurement circuit
DFF
Measurement circuit fault. Contact your local ABB representative,
quoting the auxiliary code.
5694 PU communication
configuration
Number of connected power
modules differs from expected.
Check setting of 95.31 Parallel type
configuration. 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.
Code
(hex)
Fault Cause What to do
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