Warner Electric UNIBRAKE - Manual (Page 4)

Gap Chart
No. of Discs Gap “G”
1 .075 inch
2 or 3 .090 inch
Rear Mounted
Remove cover; turn both screws “B” equal
amounts in a clockwise direction until air gap (Gap
“G”) from above chart is obtained. Measurement
of air gap should be made at approximate center
of magnet with pressure applied to armature plate
“C” to assure plate is seated on pivot balls. Failure
to adjust for wear will result in eventual loss of
braking torque.
Note: Unequal adjustment of screws “B” will result
in unequal pivot action on balls that will increase
noise and shorten brake life.
Coupler
Remove the 3 window covers, turn both screws
“B” equal amounts in a clockwise direction until air
gap (Gap “G”) from above chart is obtained.
Measurement of air gap should be made at
approximate center of magnet with pressure
applied to armature plate “C” to assure plate is
seated on pivot balls. Failure to adjust for wear will
result in eventual loss of braking torque.
Note: Unequal adjustment of screws (B) will result
in unequal pivot action on balls that will increase
noise and shorten brake life.
4 Warner Electric • 800-825-9050 P-1699-WE
Wiring
Disconnect power before
touching any internal part.
Unibrake magnet coils (AC) are single phase and
dual voltage. These can be wired internal to the
motor. Direct current brake coils must be
separately operated; switch contacts to control the
brake must be different from those used to control
the motor. Normally, motor and brake
contacts must be interlocked.
Determine the voltage of the brake and use the
appropriate wiring instructions below.
Wear Adjustments
1) Disconnect power brake before
touching any internal part. 2) Any loads that are
held in position by this brake must be
supported before performing any adjustments
or maintenance.
Unibrake discs require periodic adjustment due to
expected wear. On rapid cycling applications
regular inspections should take place, i.e. after
20,000 to 50,000 cycles for the first inspection and
then every 150,000 to 200,000 cycles. Adjustments
should be made to the air gap between the
armature and magnet for continued brake
effectiveness. If an increase in stopping time is
noted adjust brake as follows:
Brake Leads (B) to Motor Leads (T)
Motor Voltage or Separate Power Supply
3 Phase AC
Low Voltage B1 & B3 to T1 & T7 B2 & B4 to T2 & T8
High Voltage B1 to T1 B2 to B3 B4 to T2
1 Phase AC
Low Voltage B1 & B3 to T1 & T3 B2 & B4 to T2 & T4
High Voltage B1 to T1 B2 to B3 B4 to T4
Separately AC
Low Voltage B1 & B3 to Line 1 (L1) B2 & B4 to Line 2 (L2)
High Voltage B1 to Line 1 (L1) B2 to B3 B4 to Line 2 (L2)
Separately DC 24 or 90 VDC
B1 to DC + B2 to DC -
Coils are not polarity sensitive
connections can be reversed.