Warner Electric Electro-Packs EP-250-W, EP-400-W - Manual (Page 4)

4 Warner Electric • 800-825-9050 P-1510 • 819-0475
Servicing Worn Components
The normal wearing components of an Electro-
Pack are the brake magnet/armature, and the
clutch rotor/armature. Since special tools are
required to service these components, Warner
Electric does not recommend user service of the
Troubleshooting
Problem Possible Cause Correction
Clutch or brake fails to engage.
No or insufficient DC power
supplied to clutch or brake
coils.
Remove the EP-W cover, turn on the electrical power to the terminals, and
check the voltage across each pair of terminals. The voltage at the terminals
should be within 5% of the units rated voltage. If not, adjust or change the
power supply to obtain the rated voltage.
Incorrect coil resistance.
Remove the EP-W cover, disconnect the lead wires from the terminals on the
clutch and brake coils, and measure the resistance of each coil with an
appropriate ohmmeter. Both resistance measurements should be within 10%
of the values listed in the Electrical Specifications of this instruction sheet. If
not, replace the EP-W with a new unit.
Clutch or brake air gap out of
adjustment.
Remove the EP-W cover, and inspect the gaps between the clutch rotor and
armature, and the brake magnet and armature. The gaps should be no larger
than .023" for EP-W-250's, and .037" for EP-W-400's. Adjust the gaps by
axially moving the appropriate armature until the gap is correct. Once set,
turn the clutch and brake power on and off to confirm that they engage, and
rotate the input and output shafts to confirm that the friction surfaces do not
drag when disengaged. Readjust if necessary.
Clutch or brake slips.
EP-W not properly sized for
intended application
Review the Selection Information page of this instruction sheet to determine
if the EP-W is properly sized for the application. For additional assistance,
contact your Warner Electric distributor or Warner Electric Technical Support
at 1-800-825-9050.
Insufficient DC power sup-
plied to clutch or brake coils.
Remove the EP-W cover, turn on the electrical power to the terminals, and
check the voltage across each pair of terminals. The voltage at the terminals
should be within 5% of the units rated voltage. If not, adjust or change the
power supply to obtain the rated voltage.
Incorrect coil resistance.
Remove the EP-W cover, disconnect the lead wires from the terminals on the
clutch and brake coils, and measure the resistance of each coil with an
appropriate ohmmeter. Both resistance measurements should be within 10%
of the values listed in the Electrical Specifications of this instruction sheet. If
not, replace the EP-W with a new unit.
Clutch or brake friction faces
contaminated.
Remove the EP-W cover and inspect the clutch and brake friction faces for
contaminants. The friction surfaces should have a dry, polished appearance
with some dust present. If they are wet or oily they can be carefully cleaned
with a solvent, but optimum performance may never be achieved once the
faces are contaminated. If slipping persists after cleaning, replace the EP-W
with a new unit.
units. For more information contact your Warner
Electric distributor, or call Warner Electric at
1-800-234-3369.