Warner Electric UNIBRAKE NEMA 4 - Manual (Page 2)

2 Warner Electric • 800-825-9050 P-1701-WE
General Information
Unibrake Motor Brakes are not a
fail safe device. Where holding load represents
a risk of property damage, and/or personal
injury, an independent fail safe device must be
supplied independent of this brake. These
safety devices are neither provided nor are they
the responsibility of Warner Electric.
Warner Electric Unibrake motor brakes are spring
set, electro-magnetic release, direct acting, disc
brakes for the controlled stopping and holding of a
load. They have single phase electro-magnetic
coils in standard voltages and frequencies and are
factory set for rated retarding torque.
Construction
Motor brakes utilize one or more non-asbestos
friction discs mounted on a metal hub which is
fastened to a rotating shaft. The brake uses a two
ball pivot design for its armature plate. It also has
a self resetting manual release lever. Anti-rattle
clip between the rotating disc and hub help reduce
torsional vibration and pulsation noise. Unibrakes
housing is cast iron NEMA 4.
Contents
General Information. . . . . . . . . . . . . . . . . . . . . . . . 2
Brake Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Wear Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . 4
Torque Adjustments . . . . . . . . . . . . . . . . . . . . . . . 4
Disc Replacement . . . . . . . . . . . . . . . . . . . . . . . . . 4
Coil Replacement . . . . . . . . . . . . . . . . . . . . . . . . . 5
Service Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Warranty. . . . . . . . . . . . . . . . . . . . . . . . . Back Page
Operation
When properly connected, starting the motor
energizes the brake magnet coil, attracting the
armature to the coil, compressing the torque
springs, releasing pressure on the pressure
plates, permitting the brake discs to rotate
freely. When the motor and the brake magnet
coil de-energize, this decompresses the torque
springs, forcing the rotating disc(s) and
stationary pressure plates together, stopping
and holding the motor shaft and load.
When the motor is ‘off,’ to move the driven load
without energizing the motor, rotating the manual
release lever 90 degrees clockwise removes the
retarding torque from the motor shaft letting the
load be hand-moved. The lever returns to the
normal “set” position when the brake is
re-energized.
Brake Head
A = Torque Adjust Nuts and Springs
B = Wear Adjustment Screws
C = Armature Plate
G = Cover Mounting Studs
L = Lead Wires
M = Mounting Holes (2)
P = Solenoid (coil)