NEMA 4 UNIBRAKE
Warner Electric
®
Motor Brakes
P-1701-WE
Installation & Operating Instructions
Contents
Operation
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
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.
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
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.
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)
Warner Electric • 800-825-9050 P-1701-WE
2
Any mechanism or load held in
position by the brake should be checked to
avoid possible damage or injury to personnel
before brake is released manually.
Installation
This brake is assembled and tested prior to
shipment. It must be disassembled to mount to
your motor and maintain seals to your motor. Do
not make any adjustments to the (2) Wear
Adjustment Screws “B” or (2) Torque Adjust Nuts
“A” during installation to your motor.
• Replace pressure plate(s) and friction disc(s)
into housing keeping them in their original
order.
• Remove hand tightened caps screws from head
casting. Replace brake mechanism with coil
into housing and tighten with (2) cap screws,
lock washers and (2) cover hex studs.
• Rotate release lever one or two times to verify
release and assembly of brake is correct.
• 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 after wiring.
Wiring
Brake disassembly
• Place brake on bench or work surface; remove
cover from brake.
• Remove the two cover hex mounting studs and
brake mechanism with coil. Do not make any
adjustments to the brake mechanism.
• Remove pressure plate(s) and friction disc(s)
keeping them in the original order.
• Remove brake hub. Be careful not to
damage housing seal.
Brake assembly to your motor
• Position brake head casting onto motor
mounting face and secure by hand tightening
(2) 3/8 inch socket head cap screws.
• Attach hub to shaft using key and set screws
provided with Unibrake. Position hub 5/16 inch
below head surface. Do not damage housing
seal when sliding hub through seal. Tighten
(2) set screws to motor shaft with 55-100 in. lbs.
of torque. Set screws can be accessed through
conduit opening.
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.
Remove cover, turn both screws “B” equal
amounts in a clockwise direction until air gap (Gap
“G”) from above chart is obtained.
Warner Electric • 800-825-9050 P-1701-WE
3
Determine the voltage of the brake and use the
appropriate wiring instructions below.
Remove cover, turn both screws “B” equal
amounts in a clockwise direction until air gap (Gap
“G”) from above chart is obtained.
Motor Voltage
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
Separately DC 24 or 90 VDC
Low Voltage 115 VAC B1 & B3 to Line 1 (L1) B2 & B4 to Line 2 (L2)
High Voltage 230 VAC B1 to Line 1 (L1) B2 to B3 B4 to Line 2 (L2)
Brake Leads (B) to Motor Leads (T)
or Separate Power Supply
B1 to DC + B2 to DC -
Coils are not polarity sensitive
connections can be reversed.
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.
Motor brake 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:
Gap Chart
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.
Torque Adjustments
Most applications do not require torque
adjustments. Motor brakes are factory set for
rated torque which is maximum torque. To
increase stopping time or reduce torque on 3, 6,
and 10 ft. lb., turn 2 lock nuts “A” an equal amount
counterclockwise to increase spring length. For
the 6, 10, and 15 ft. lb. brakes, one full turn will
reduce torque by about 12-1/2%. The 3 ft. lb.
brake will be reduced in torque by about 8%.
Torque should not be reduced by less than 1/2 of
the rated torque.
If torque is adjusted measure air gap (see wear
adjustment) and verify it is within dimensions from
Gap Chart.
No. of Discs Gap “G”
1 .075 inch
2 or 3 .090 inch
before touching any internal part. 2) Any loads
that are held in position by this brake must be
1) Disconnect power brake
supported before performing any adjustments
or maintenance.
Warner Electric • 800-825-9050 P-1701-WE
4
Friction Disc Replacement
Hubs
Remove cover, (2) cover support studs “G”, and (2)
3/8-16 mounting cap screws at “M”.
Lift off brake mechanism assembly. Remove
pressure plate(s) and brake disc(s). Replace with
new pressure plate(s) and disc(s). Reassemble
brake mechanism assembly. Multiple disc units,
the domed pressure plate is positioned furthest
away from the motor or brake head; the (B) wear
adjustment screws are in contact with this plate.
Note: Cast Iron Head uses casting surface for last
pressure plate. Set air gap as for wear
adjustment.
Magnetic Coil Replacement
Remove cover, (1) cover stud “G”, (1) 3/8-16
mounting cap screw “M” and (2) slotted screws
“E”.
Lift off complete coil assembly “P” and replace
with new coil assembly of proper electrical rating.
Position leads so as to avoid contact with rotating
parts. Set air gap as for Wear Adjustment.
Disc/Pressure Plate Kits
Number Kit Kit
Discs Number Contents
Cast Iron Heads
1 327212-4 1FD and 1DPP
2 327212-5 2FD, 1DPP and 1FPP
3 327212-6 3FD, 1DPP and 2FPP
FD = Friction Disc, DPP = Domed Plate FPP = Flat Plate
CI Head
Bore Hub Number
5/8 58D29
3/4 58D30
7/8 58D31
Cast Iron Head Hub
Coil Assembly (Solenoids)
Unibrake magnet coils (AC) are single phase.
Coil Voltage Coil Part No. DC Resistance*
60/115/230 VAC 79137-18-K
50/115/230 VAC 79137-18-N
50/220/440 VAC 79137-18-P
60/230/460 VAC 79137-18-J
60/200/400 VAC 79137-18-L
60/287/575 VAC 79137-18-G
50/208/416 VAC 79137-18-M
24 VDC 327208 Leads B1 to B2 = 26.4 Ohms
90 VDC 327209 Leads B1 to B2 = 390 Ohms
*Resistance values plus or minus 10% at 25°C.
Leads B1 to B2 or
B3 to B4 = 8.7 Ohms
Leads B1 to B2 or
B3 to B4 = 11.5 Ohms
Leads B1 to B2 or
B3 to B4 = 43.5 Ohms
Leads B1 to B2 or
B3 to B4 = 34.5 Ohms
Leads B1 to B2 or
B3 to B4 = 24.3 Ohms
Leads B1 to B2 or
B3 to B4 = 54.5 Ohms
Leads B1 to B2 or
B3 to B4 =35.6 Ohms
Friction Disc Only
1 327213 Disc with Anti-Rattle Clip
Coil Assembly
Friction Disc (FD)
5 inch diameter
Warner Electric • 800-825-9050 P-1701-WE
Pressure Plates
Domed (DPP) / Flat (FPP)
5
Warranty
Warner Electric LLC warrants that it will repair or replace (whichever it deems advisable) any
product manufactured and sold by it which proves to be defective in material or workmanship
within a period of one (1) year from the date of original purchase for consumer, commercial or
industrial use.
This warranty extends only to the original purchaser and is not transferable or assignable without
Warner Electric LLC’s prior consent.
Warranty service can be obtained in the U.S.A. by returning any defective product, transportation
charges prepaid, to the appropriate Warner Electric LLC factory. Additional warranty information
may be obtained by writing the Customer Satisfaction Department, Warner Electric LLC, 449
Gardner Street, South Beloit, Illinois 61080, or by calling 815-389-3771.
A purchase receipt or other proof of original purchase will be required before warranty service is
rendered. If found defective under the terms of this warranty, repair or replacement will be made,
without charge, together with a refund for transportation costs. If found not to be defective, you will
be notified and, with your consent, the item will be repaired or replaced and returned to you at
your expense.
This warranty covers normal use and does not cover damage or defect which results from
alteration, accident, neglect, or improper installation, operation, or maintenance.
Some states do not allow limitation on how long an implied warranty lasts, so the above limitation
may not apply to you.
Warner Electric LLC’s obligation under this warranty is limited to the repair or replacement of the
defective product and in no event shall Warner Electric LLC be liable for consequential, indirect,
or incidental damages of any kind incurred by reason of the manufacture, sale or use of any
defective product. Warner Electric LLC neither assumes nor authorizes any other person to give
any other warranty or to assume any other obligation or liability on its behalf.
WITH RESPECT TO CONSUMER USE OF THE PRODUCT, ANY IMPLIED WARRANTIES WHICH
THE CONSUMER MAY HAVE ARE LIMITED IN DURATION TO ONE YEAR FROM THE DATE OF
ORIGINAL CONSUMER PURCHASE. WITH RESPECT TO COMMERCIAL AND INDUSTRIAL
USES OF THE PRODUCT, THE FOREGOING WARRANTY IS IN LIEU OF AND EXCLUDES ALL
OTHER WARRANTIES, WHETHER EXPRESSED OR IMPLIED BY OPERATION OF LAW OR
OTHERWISE, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS.
Some states do not allow the exclusion or limitation of incidental or consequential damages, so the
above limitation or exclusion may not apply to you. This warranty gives you specific legal rights and
you may also have other rights which vary from state to state.
Changes in Dimensions and Specifications
All dimensions and specifications shown in Warner Electric catalogs are subject to change without
notice. Weights do not include weight of boxing for shipment. Certified prints will be furnished
without charge on request to Warner Electric.
Warner Electric LLC
31 Industrial Park Road • New Hartford, CT 06057
815-389-3771 • Fax: 815-389-2582
www.warnerelectric.com
An Altra Industrial Motion Company
P-1701-WE 06/11 Printed in USA
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