Warner Electric UNIBRAKE - Manual (Page 2)

2 Warner Electric • 800-825-9050 P-1699-WE
General Information
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
Unibrakes 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. Rear
mounted Unibrakes are available in standard
aluminum or cast iron housed constructions and
the double NEMA “C” Face coupler in aluminum
only.
Contents
General Information. . . . . . . . . . . . . . . . . . . . . . . . 2
Brake Heads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Wear Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . 4
Torque Adjustments . . . . . . . . . . . . . . . . . . . . . . . 5
Disc Replacement . . . . . . . . . . . . . . . . . . . . . . . . . 5
Coil Replacement . . . . . . . . . . . . . . . . . . . . . . . . . 5
Service Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
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 stationary
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 Heads
A = Torque Adjust Nuts and Springs
B = Wear Adjustment Screws
C = Armature Plate
G = Cover Mounting (2) Studs Rear Mounted, (4)
Bolts/Nuts Coupler
L = Lead Wires
M = Mounting Holes (2 rear mounted, 4 coupler)
P = Solenoid (coil)
Rear Mounted
Double “C” Face Coupler