Warner Electric UNIBRAKE User Manual
UNIBRAKE
Warner Electric
®
Motor Brakes
P-1699-WE
Installation & Operating Instructions
Rear Mounted
Double “C” Coupler
Contents
Operation
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
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.
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
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.
Rear Mounted
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.
Warner Electric • 800-825-9050 P-1699-WE
2
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)
Double “C” Face Coupler
Any mechanism or load held in
Customers
Motor
5/16 inch
Hub
Key
Motor
Output
Shaft
End
Customers
Motor
Hub
Key
Motor
Output
Shaft
End
1/2 inch
position by the brake should be checked to
avoid possible damage or injury to personnel
before brake is released manually.
Installation
Rear Mounted
Coupler style output shaft must
be direct
coupled to load not for belted or any
type overhung load applications.
Remove (4) hex screws and lift off cover/shaft
assembly. Remove brake hub and attach it to the
motor shaft using the long key and set screws.
Locate hub 5/16 inch away from mounting face of
motor as shown below. Tighten setscrews to 55-
Coupler
Remove cover from brake, locate brake hub. Attach hub to shaft using key and set screw
provided. Position hub from mounting face of motor
as shown for your type of brake head. Tighten set
screws to 55-100 in. lbs. of torque. Slip brake head
body onto mounting face and fasten with (2) 3/8
inch socket head cap screws. Cover will be assembled after brake is wired. Leads should be twisted
and inserted into the insulation sleeve and routed
to conduit port or openings through back of motor.
Aluminum Brake Head
100 in. lbs. of torque. Slip brake head assembly
over brake hub and onto the motor mounting face.
Fasten with (4) 3/8-16 socket head cap screws.
Leads should be twisted and routed across top
front of coil away from rotating brake hub and then
routed through lead clip on side of coil. Replace
brake cover/shaft assembly after wiring by
inserting keyed shaft into the brake hub extension
and guiding cover over the brake head assembly,
the center window should be located over brake
release lever to allow for gap inspection. Secure
with (4) hex bolts and nuts.
Rear
Mounted
Coupler
Cast Iron Brake Head
Warner Electric • 800-825-9050 P-1699-WE
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