Warner Electric Gen 2 Ceramic Faced Clutch_Brake UniModule UM-50C, UM-180C - Manual (Page 6)

Electrical Connections
To avoid injury (or even death),
always make certain all power is off before
attempting to install or service this device or
any electrical equipment.
Warner Electric Ceramic UniModules are provided
with a conduit hole threaded for a standard 1/2
inch conduit connection. Both the clutch and
brake lead wires exit this opening. If a Conduit
Box is desired, Warner Electric Conduit Box Kit,
part number: 5370-101-042, can be purchased
separately. The Conduit Box provides two conduit
connection holes for standard 1/2 inch conduit
connectors.
Ceramic UniModule clutch/brakes operate on DC
voltage. Warner Electric offers a complete line of
electronic controls to meet the needs of almost
any clutch or clutch/brake application. Each
Warner Electric control will show the proper
wiring connections for its use.
Troubleshooting - Electrical
If a UniModule is not functioning properly it is best
to check for these problems before replacing it.
A standard Ceramic UniModule clutch/brake
requires DC power to function. If power is not
reaching the clutch or brake, the clutch or brake
will not engage.
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 (see Electrical Coil data), 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 proper
DC voltage is leaving the power supply
and that the switch is sending power to
the clutch or brake.
• 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.
• If there is proper DC voltage present at the
magnet leads, and the clutch or brake will not
engage, an ohmmeter check of the individual
magnet coils can be made with the power off
and the circuit open. (To be certain, disconnect
one lead to the magnet.) Compare resistance
to the chart below.
Troubleshooting - Mechanical
The Ceramic UniModule is similar to a standard
UniModule except for the ceramic friction faces,
and the Autogaps
™ have been replaced by a
compression spring between the armatures. This
results in the armatures being in continuous
contact with the rotor and brake resulting in light,
continuous drag. This arrangement eliminates the
sudden change in torque that results when
autogapped armatures engage.
No adjustment is required for the life of the unit
unless it is jarred, resulting in the armature being
moved away from the mating surface and cocking
Electrical Coil Data
Clutch Brake Clutch Brake Clutch Brake
Voltage–D.C. 90 90 24 24 6 6
Resistance UM-50-C 452 452 31.8 28.8 1.86 1.86
(OHMS) UM-180-C 392 392 26.7 26.7 1.81 1.81
Current UM-50-C .199 .199 .755 .833 3.23 3.23
(Ampheres) UM-180-C .230 .230 .896 .896 3.31 3.31
Power UM-50-C 17.9 17.9 18.1 20.0 19.4 19.4
(WATTS) UM-180-C 20.7 20.7 21.5 21.5 20 20
Coil Build Up UM-50-C 52 53 52 53 52 53
Time (ms) UM-180-C 72 75 72 75 72 70
Coil Decay UM-50-C 6.2 5.0 6.2 5.0 6.5 5.0
Time (ms) UM-180-C 12 10 12 10 12 10
Warner Electric • 800-825-9050 P-273-10 • 819-0532 6