9
Malfunctions
Brake malfunctions
Operating Instructions – CM3C63 – 100
110
Fault
Possible cause
Measure
Motor heats up exces-
sively (measure tem-
perature, significantly
higher than 120 °C)
Overload
Check load for sluggishness, use larger motor
or reduce load if necessary, check travel pro-
file
Ambient temperature too high
Observe permitted temperature range
Insufficient cooling
Correct cooling air supply or clear cooling air
passages, retrofit forced cooling fan if neces-
sary
Forced cooling fan does not run
Check connection, correct if necessary
Nominal duty cycle (S1 to S10, EN
60034) exceeded, e.g. caused by
excessive effective torque
Adjust the nominal duty cycle of the motor to
the required operating conditions; consult a
professional to determine the proper drive, if
necessary
Inverter not optimized
Check the inverter
Running noise on mo-
tor
Bearing damage
Contact SEW-EURODRIVE.
Replace the motor
Vibration of rotating parts
Rectify cause, possible imbalance
Forced cooling fan: Foreign bodies
in cooling air ducts
Clean cooling air ducts
9.3
Brake malfunctions
9.3.1
BK.. brake
Fault
Possible cause
Measure
Brake does not re-
lease
Brake connected incorrectly.
Check the connection of the brake.
Incorrect voltage at brake control unit,
e.g. voltage drop in the supply cable >
10%.
Check voltage at motor connection:
Correct connection voltage; check cable
cross section.
Brake coil has interturn fault or short cir-
cuit to exposed conductive part.
Contact SEW-EURODRIVE.
Brake does not ap-
ply/brake.
Incorrect braking torque.
Contact SEW-EURODRIVE.
Motor/brake replacement by
SEW‑EURODRIVE.
Noise/squeaking
near the brake
Brake parameters set incorrectly in the
inverter.
Check brake release and application times.
Brake does not ap-
ply
Maximum permitted working air gap ex-
ceeded because brake lining worn
down.
Contact SEW-EURODRIVE.
Motor/brake replacement by
SEW‑EURODRIVE.
26870460/EN – 05/2021
