ABB ACS880 Firmware Manual page 667

Code Event name /
(hex) Aux. code
7184 Brake resistor
wiring
7191 BC short
circuit
7192 BC IGBT
excess
temperature
71A2 Mech brake
closing failed
71A3 Mech brake
opening failed
71A5 Mech brk
opening not
allowed
Cause
Brake resistor short circuit or brake
chopper control fault.
Short circuit in brake chopper IGBT.
Brake chopper IGBT temperature has
exceeded internal fault limit.
Mechanical brake control fault.
Activated eg. if brake
acknowledgement is not as expected
during brake closing.
Mechanical brake control fault.
Activated eg. if brake
acknowledgement is not as expected
during brake opening.
Open conditions of mechanical brake
cannot be fulfilled (for example, brake
has been prevented from opening by
parameter 44.11 Keep brake
In an encoderless application, the
brake is kept closed by a brake close
request (either from parameter
What to do
Check that braking cycle meets
allowed limits.
Check brake chopper and brake
resistor connection.
Ensure brake resistor is not damaged.
After correcting the cause of the fault,
reboot the control unit (using
parameter 96.8 Control board
or by cycling power.
Ensure brake resistor is connected and
not damaged.
Check the electrical specifications of
the brake resistor against the
Hardware manual .
Replace brake chopper (if replaceable).
After correcting the cause of the fault,
reboot the control unit (using
parameter 96.8 Control board
or by cycling power.
Let chopper cool down.
Check for excessive ambient
temperature.
Check for cooling fan failure.
Check for obstructions in the air flow.
Check the dimensioning and cooling
of the cabinet.
Check resistor overload protection
function settings (parameter group
43 Brake chopper).
Check that braking cycle meets
allowed limits.
Check that drive supply AC voltage is
not excessive.
Check mechanical brake connection.
Check mechanical brake settings in
parameter group
control.
Check that acknowledgement signal
matches actual status of brake.
Check mechanical brake connection.
Check mechanical brake settings in
parameter group
control.
Check that acknowledgement signal
matches actual status of brake.
Check mechanical brake settings in
parameter group
control (especially
closed). closed).
Check that acknowledgement signal
(if used) matches actual status of
44.12 brake.
Fault tracing 667
boot)
boot)
44 Mechanical brake
44 Mechanical brake
44 Mechanical brake
44.11 Keep brake