Warner Electric Gen 2 Electro-Module EM-50, EM-100, EM-180 - Manual (Page 10)

10 Warner Electric • 800-825-9050 819-0529
The following procedure describes how to set the
adjustable power supply to the optimum release
point of the brake. A volt-meter is required to
perform the procedure.
No power is applied to motor during this
procedure. Power normally supplied by motor
to brake control should be supplied by
alternate method.
1. With power off, connect the positive (red)
lead of the power supply to the positive
(black) lead of the brake and the negative
lead of the power supply to the negative 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 readjusting the airgap per Section C
and/or repeating brake release adjustment
steps 1-5 above.
Note: If you have a clutch/FB brake, the clutch
armature airgap should be adjusted at this time
per section C. The brake must be
energized/released during the clutch airgap
adjustment so the output shaft can be rotated by
hand.
Section K: Burnishing
Intimate metal to metal contact is essential
between the armature and the metal rings
(poles) of the magnet or rotor. Warner Electric
clutches and brakes leave the factory with the
friction material slightly undercut to assure good
initial contact.
Normally, the desired wearing-in process occurs
naturally as the surfaces slip upon engagement.
The time for wear-in, which is necessary to
obtain the ultimate torque of the unit, will vary
depending on speed, load, and duty cycle.
If maximum torque is required immediately after
installation, the unit should be burnished by
slipping the friction surfaces together at reduced
voltage. It is recommended that the burnishing
be done right on the application, if at all
possible.
Burnishing at high speed will result in a
smoother wear-in pattern and reduce the time
for burnishing. The voltage should be set at
approximately 30% or 40% of the rated value.
The unit should be cycled on and off to allow
sufficient time between slip cycles to prevent
overheating.
When a Warner Electric brake or clutch is
properly assembled and installed, no further
servicing, lubrication, or maintenance should
be required throughout the life of the unit.
Troubleshooting - Electrical
A module that is not functioning properly may
be caused by other problems. It is best to check
for these problems before replacing it.
A standard Electro-Module clutch or brake
requires DC power to function. If power is not
reaching the clutch or brake, they 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.