Warner Electric Gen 2 Clutch_Brake UniModule UM-50, UM-100, UM-180 - 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 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.
UniModule clutches and 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
A UniModule that is not functioning properly may
be caused by other problems. It is best to check
for these problems before replacing it.
A UniModule requires DC power to function. If
power is not reaching the clutch or brake, they 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.
• 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 brake armatures are equipped
with an Autogap™ assembly that maintains the
proper airgap between friction faces through the
life of the product. Each UniModule is airgap
adjusted and pre-burnished at the factory, but the
airgaps can shift as a result of rough handling
during shipping and installation.
An airgap that is too large can prevent the
armature from engaging. An airgap that is too
small can cause the armature to rub continuously,
causing higher running temperatures and
decreased wear life.
To reset the airgaps, you will need to access the
armatures. Looking through the vents on either
side of the housing, you will see the fan on the
clutch rotor. Rotate the fan (input) until you see the
1/2 x 1 inch window on the outer periphery of the
fan.
Electrical Coil Data
Clutch Brake Clutch Brake Clutch Brake
Voltage–D.C. 90 90 24 24 6 6
Resistance UM-50 452 429 31.8 28.8 1.9 1.9
(OHMS) UM-100/180 392 392 26.7 26.7 1.8 1.8
Current UM-50 .20 .21 .76 .83 3.2 3.2
(Ampheres) UM-100/180 .23 .23 .90 .90 3.3 3.3
Power UM-50 18 19 19 20 20 20
(WATTS) UM-100/180 21 21 22 22 20 20
Coil Build Up UM-50 52 53 52 53 52 53
Time (ms) UM-100/180 72 75 72 75 72 70
Coil Decay UM-50 6 5 6 5 6 5
Time (ms) UM-100/180 12 10 12 10 12 10
Warner Electric • 800-825-9050 P-273-4 • 819-0528 6