ABB ACS860 - Page 355

Fault tracing 355
A7A2 Mechanical brake
opening failed
Programmable warning:
44.17 Brake fault function
Status of mechanical brake
acknowledgement is not as
expected during brake open.
Check mechanical brake connection.
Check mechanical brake settings in
parameter group 44 Mechanical brake
control.
Check that acknowledgement signal
matches actual status of brake.
A7A5 Mechanical brake
opening not allowed
Programmable warning:
44.17 Brake fault function
Open conditions of mechanical
brake cannot be fulfilled (for
example, brake has been
prevented from opening by
parameter 44.11 Keep brake
closed).
Check mechanical brake settings in
parameter group 44 Mechanical brake
control (especially 44.11 Keep brake
closed).
Check that acknowledgement signal (if
used) matches actual status of brake.
A7B0 Motor speed feedback
Programmable warning:
90.45 Motor feedback fault
No motor speed feedback is
received.
Check the auxiliary code (format XXYY
ZZZZ). “XX” specifies the number of the
encoder interface module (01:
91.11/91.12), “YY” specifies the encoder
(01: 92 Encoder 1 configuration). “ZZZZ”
indicates the problem (see actions for
each code below).
0001 Motor gear definition invalid or
outside limits.
Check motor gear settings (90.43 and
90.44).
0002 Encoder not configured. Check encoder settings (92 Encoder 1
configuration).
Use parameter 91.10 Encoder parameter
refresh) to validate any changes in the
settings.
0003 Encoder stopped working. Check encoder status.
0004 Encoder drift detected. Check for slippage between encoder and
motor.
A7B1 Load speed feedback
Programmable warning:
90.55 Load feedback fault
No load speed feedback is
received.
Check the auxiliary code (format XXYY
ZZZZ). “XX” specifies the number of the
encoder interface module (01:
91.11/91.12), “YY” specifies the encoder
(01: 92 Encoder 1 configuration). “ZZZZ”
indicates the problem (see actions for
each code below).
0001 Load gear definition invalid or
outside limits.
Check load gear settings (90.53 and
90.54).
0002 Feed constant definition invalid
or outside limits.
Check feed constant settings (90.63 and
90.64).
0003 Encoder stopped working. Check encoder status.
A7C1 FBA A communication
Programmable warning:
50.02 FBA A comm loss
func
Cyclical communication
between drive and fieldbus
adapter module A or between
PLC and fieldbus adapter
module A is lost.
Check status of fieldbus communication.
See user documentation of fieldbus
interface.
Check settings of parameter groups 50
Fieldbus adapter (FBA), 51 FBA A
settings, 52 FBA A data in and 53 FBA A
data out.
Check cable connections.
Check if communication master is able to
communicate.
Code
(hex)
Warning Cause What to do