20
Warner Electric • 800-825-9050
P-2003-2 • 819-0420
Troubleshooting
General: The chart below will be helpful when isolating exact problems that may occur in the control system . When
the system has been running for some time, the chart will also prove helpful when checking for worn, broken or
frayed wires; bent or broken control system parts; blown fuses; loose terminal connections and defective wire
connections .
Symptom A: Green LED indicator does not illuminate with power on
Probable Cause
Solution
No power is applied to the control
Check that AC power is on .
Fuse Blown
Check fuse and replace if blown .
Symptom B: Red LED illuminates short circuit
Shorted magnet coil
Check magnet coil resistance for approximately 66-68 ohms
cold for MTB’s . Coil resistance for 2-wire brakes, TB’s,
ATT’s and Magnetic Particle units will vary . Check resistance
specifications in Tension Catalog P-771 or appropriate
service manual .
Brake connections improperly wired
Check wiring and rewire if necessary .
Transient Noise
Check for source of noise and suppress .
Segregate wiring .
Used shielded cable .
Note:
After checking control . Reset control by turning the switch to “off” and then to “run” .
Symptom C: Brake is not engaging
Mode switch in brake “off” position
Set mode selector to “run” position .
Tension set at zero
Increase tension adjust .
Remote mode switch in brake off position
Set remote mode switch to “run” position .
Remote sensors incorrectly wired
Check wiring and rewire if necessary .
No signal on analog inputs
Check wiring and signal from PLC or ultrasonic sensor .
No power to control
Refer to Symptom A .
Symptom D: Brake is not releasing
Mode switch in brake “on” or “stop” position
Set mode selector switch to “run” position .
Tension adjust set at maximum
Reduce level and see if brake rotates .
Remote mode switch in brake “on” or “stop”
Set remote mode selector to “run” .
position
Remote sensor incorrectly wired
Check wiring and rewire if necessary .
Mechanical binding
Check brake for freewheeling when control power is off .
Correct if mechanical problems still exist .
Symptom E: Brake does not have adequate torque capacity
Brake is incorrectly sized
Verify brake sizing by repeating the selection procedure in
Tension Catalog P-771 .
Brake is incorrectly wired
Recheck wiring and magnet connections and rewire if
necessary .
Local or remote tension adjust
Recheck set-up procedures for the incorrectly set mode of
operation in which the control is used . Readjust if necessary .
