ABB ACS880 - Page 555

What to doCause
Event name /
Aux. code
Code
(hex)
Check mechanical brake settings in
parameter group 44 Mechanical brake
control.
Activated eg. if brake acknowledgement
is not as expected during brake opening.
Check that acknowledgement signal
matches actual status of brake.
Check mechanical brake settings in
parameter group 44 Mechanical brake
Open conditions of mechanical brake
cannot be fulfilled (for example, brake
has been prevented from opening by
parameter 44.11 Keep brake closed).
Mech brk
opening not
allowed
71A5
control (especially 44.11 Keep brake
closed).
In an encoderless application, the brake
is kept closed by a brake close request
Check that acknowledgement signal (if
used) matches actual status of brake.
(either from parameter 44.12 Brake close
Check the source signal selected by
parameter 44.12 Brake close request.
request or from an FSO-xx safety
functions module) against a modulating
drive for longer than 5 seconds.
Check the safety circuits connected to
the FSO-xx safety functions module.
Check external fan (or other equipment
controlled) by the logic.
No feedback received from external fan.Motor fan71B1
Check settings of parameters
35.100…35.106.
See A7B0 Motor speed
feedback (page 571).
No motor speed feedback received.Motor speed
feedback
7301
Overspeed7310
• Check minimum/maximum speed
settings, parameters 30.11
• Motor is turning faster than highest
allowed speed due to incorrectly set
minimum/maximum speed,
Minimum speed, 30.12 Maximum
insufficient braking torque or
speed and 31.30 Overspeed trip
margin.
changes in load when using torque
reference.
Check adequacy of motor braking
torque.
• Incorrect estimated speed.
Check applicability of torque
control.
Check need for brake chopper and
resistor(s).
• Check the status of motor current
measurement.
Perform a Normal, Advanced or
Advanced Standstill ID run instead
of, for example, a Reduced or
Standstill.
See parameter 99.13 ID run
requested (page 531).
Contact your local ABB representative.Internal fault.Encoder
internal
7380
See A7E1 Encoder (page 572).
Encoder feedback fault.Encoder7381
See A797 Speed feedback
configuration (page 567).
Speed feedback configuration incorrect.Speed fbk
configuration
73A0
Check the auxiliary code (format XXYY
ZZZZ). “XX” specifies the number of the
No load position feedback received.Load position
feedback
73A1
encoder interface module (01:
91.11/91.12, 02: 91.13/91.14), “YY”
specifies the encoder (01: 92 Encoder 1
Fault tracing 555