Warner Electric Gen 2 Clutch_Electrically Released Brake UniModule UM-50FBC, UM-100FBC, UM-180FBC - Manual (Page 7)

of the power supply to the positive (red)
lead of the brake and the negative lead of
the power supply to the negative (black)
lead of the brake.
2. Connect a volt-meter to measure the
voltage applied across the brake.
3. Adjust the power supply to its lowest
possible output, and then energize the
power supply to apply power to the brake
only.
4. Starting from the low voltage point, slowly
increase the applied voltage while visually
watching the brake armature through one
of the vent slots and fan slot on either side
of the module until the brake armature
disengages from the brake magnet. Note
and record this voltage reading.
5. Add twenty (20) volts for a 90 volt brake
and five (5) volts for a 24 volt brake to this
reading and set the supply to this level.
This will be the proper release voltage for
your setup.
6. With the brake energized, spin the output
shaft by hand to insure that it turns freely.
If a scraping sound is noted when the
output shaft is spun, it means an
armature is dragging slightly. This needs to
be corrected by repeating brake release
adjustment steps 1-5 above and/or
performing armature airgap adjustment as
described in the Troubleshooting –
Mechanical section of this instruction.
Troubleshooting - Electrical
If a UniModule is not functioning properly it is
best to check for these problems before
replacing it.
A standard UniModule FBC clutch/brake
requires DC power to function. If power is not
reaching the clutch or brake, the clutch will
not engage and the brake will not disengage.
A good practice to follow is to check for
power at the lead wires to the clutch or brake
using a voltmeter.
• If power is present in the proper voltage
and current, then skip ahead to the
Mechanical Troubleshooting section.
• If power is not present, inspect the lead
wires for breaks or cuts.
• If the wires are intact, the problem may
be with the power supply or the switch.
• Using a voltmeter, check to see that
voltage is leaving the power supply and
that the switch is sending power to the
clutch or brake.
• Finally, if there is no power leaving the
switch or power supply, check the
incoming AC power to ensure that it is
reaching the power supply.
Troubleshooting - Mechanical
Both clutch and FB brake armatures are
equipped with an Autogap
TM assembly that
maintains the proper airgap between friction
faces through the life of the product. Each
UniModule is airgap adjusted and pre-
Electrical Coil Data
Clutch Brake Clutch Brake
Voltage–D.C. 90 90 24 24
Resistance UM-50 452 429 31.8 28.8
(OHMS) UM-100/180 392 308 26.7 21.7
Current UM-50 .20 .21 .76 .83
(Ampheres) UM-100/180 .23 .29 .90 1.1
Power UM-50 18 19 19 20
(WATTS) UM-100/180 21 27 22 27
Coil Build Up UM-50 52 40 52 40
Warner Electric • 800-825-9050 P-273-9 • 819-0530 7