Warner Electric Gen 2 Electrically Released Motor Brake Module for EM-MBFB and EUM-MBFB - Manual (Page 4)

4 Warner Electric • 800-825-9050 P-273-8 • 819-0531
Brake Release Adjustment
Instructions for setting the optimum release
voltage of permanent magnet applied/electrically
released brakes.
The following procedure will
result in the brake releasing and allowing the
load to be free to move. Be sure the load is in
a safe condition before proceeding with this
process.
In a permanent magnet applied/electrically
released brake, the attractive force between the
brake surfaces is created by permanent
magnets. The brake is electrically released by
applying DC power to the electro-magnetic coil
in the brake that opposes the permanent
magnets.
Electrically released brakes are polarity sensitive:
The positive lead of the power supply must be
connected to the positive (red) lead of the brake
and the negative lead of the power supply must
be connected to the negative (black) lead of the
brake.
The power supply applied to the brake must also
be adjustable so that the optimum release
voltage for each individual brake can be
determined and set.
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 lead
of the power supply to the positive (red) lead
of the brake and the negative lead of the
power supply to the negative lead (black) 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.
4. Starting from the low voltage point, slowly
increase the applied voltage while visually
watching the brake armature through the vents
on either side of the module and through the
½ by 1 inch window in the clutch rotor fan 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 motor 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. Correct this problem by repeating
steps 1 through 5 above.
If any problems should occur during adjustments
or application questions arise, please contact
Technical Support at 1-800-825-9050 Monday
through Friday 7:30 a.m. - 4:30 p.m. central time.