Warner Electric Electrically Released Brake ER-375, ER-475, ER-650 - Manual (Page 4)

4 Warner Electric • 800-825-9050 P-253 • 819-0315
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 lead of the brake, and
the negative lead of the power supply must be
connected to the negative lead of the brake. The
power supply applied to the brake must 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.
After control is adjusted per steps below, brake
control may need to be fine tuned (adjusted)
with motor running to compensate for any
changes in supply voltage used.
1. With power off, connect the positive lead of
the power supply to the positive 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, then energize the power supply only,
to apply power to the brake.
4. Starting from the low point, slowly increase
the applied voltage until the brake armature
disengages from the magnet. Note and record
the applied voltage at this point.
Tighten the screws alternately and evenly until all
are pulled up very tightly. Tap against the large
end of the bushing with a plastic hammer to
avoid damaging the bushing. The screws can
then be tightened again, using the following
torque specifications:
ER-475 55 in. Ib.
ER-650 175 in. Ib.
Repeat this alternate tapping and retightening
until the specified wrench torque no longer turns
the screws.
To disassemble, remove both screws and
reinsert one screw in the vacant hole (threads
on bushing). Tighten this screw until the bushing
is loosened in the hub. If the bushing does not
loosen, tap on the hub.
D. Power Supplies
The ER style electrically released brakes are
designed to operate with an adjustable voltage
power supply because the voltage at which the
individual brakes will release can vary slightly from
brake to brake. The output voltage needs to be
adjusted to obtain the optimum release point.
Warner Electric offers two different model power
supplies, either of which can be used to operate
the ER style brakes. They are the MCS-103-1
or the CBC-200. Refer to the control operation
manual for instructions on how to wire the
control.
E. 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