LEESON 210 C-Face Motors - Manual (Page 2)

General Description
The 87,700 Series coupler is a spring-set, elec-
trically released, self adjusting brake. The dou-
ble C-face allows the brake to directly couple a
C-face motor to a C-face gear reducer. Or, for
in-line application, the brake can be mounted
directly to a foot mounted
C-face motor, using the bearing mounted output
shaft as an in-line drive shaft.
Note: Coupler brake is designed for in-line
applications only. Do not apply overhung or side
load to brake output shaft.
I. Installation Procedure
Note 1: Check face of motor to which brake is
to be mounted, to be sure NEMA dimensions of
0.004
″ T.I.R. on concentricity and face run out
are met. Shaft run out is to be within 0.002 ″
T.I.R. Maximum shaft end float is 0.020 ″. Use
standard length NEMA shaft.
Note 2: The effectiveness of the dust-tight
waterproof brake enclosure depends on a fully
enclosed motor C-face as the brake face is not
sealed.
A. Remove hub (16) from brake assembly. With
key (not furnished) in place on motor shaft,
slide hub onto shaft to 1” (
± 1/32”) of stan-
dard motor C-face. Tighten the three set
screws over the motor shaft to 290 in-lb (on
single disc brake, the set screw over the
keyway should be tightened to 87 in-lb).
Note 3: On most applications, particularly in
vertical position, a set screw dimple drilled
into shaft is recommended.
B. Remove housing bolts (15), lock washers
(15W) and housing (7).
C. Depress solenoid plunger (29) and tie
plunger to frame (79).
D. Remove entire support plate assembly (142)
by evenly unscrewing screws (142S).
Remove screws, conical spring washers
(142W), and flat washers (142X).
E. Remove pressure plate (5), friction disc (4)
and stationary disc (3).
F. Attach endplate (2) to NEMA C-face of
motor using four 1/2-13 socket head cap
screws and medium spring lock washers
(not supplied) torque per manufacturer’s
specifications. (Head of cap screws must
not project above friction surface.)
Note 4: If motor, with or without reducer, is
to be ceiling mounted after assembly, entire
brake will have to be rotated 180
° or upside
down so it will be positioned with solenoid
plunger (29) above frame when final assem-
bly is mounted on ceiling. Similarly, for hori-
zontal wall mounting, rotate 90
°.
G. Reassemble friction discs (be sure
friction discs slide freely, file I.D. if neces-
sary), springs (if vertical), stationary discs,
and pressure plate in correct sequence and
position. All parts must
slide freely. The universal mounting pressure
plate presently used has three tapered reliefs
on outboard face.
Note 5: Brakes with a single friction disc do
not have stationary discs. Vertically mounted
brakes will have springs to separate station-
ary discs (except one disc vertical below).
Note color coded sequence of springs (fig-
ures 2A, 2B, & 2C) for proper assembly of
vertical mounting components.
H. Mount support plate assembly, torque
screws to 50 in-lbs in endplate. Conical
spring washer installed under the screw
head. Flat washer used under the
conical spring washer only with
aluminum support plate. Be sure that assem-
bly is mounted with the solenoid
in a vertical position (plunger above frame)
as shown when brake is horizontal. If
plunger is not tied down and has allowed the
mechanism to overadjust, it will have
to be reset before mounting support plate.
In this case the lever arm throat will
be near, or touching, the pinion teeth. Refer
to
Self-Adjust Maintenance . Loosen pres-
sure spring cap screw (19) until pressure
spring (11) is free, mount support plate
assembly to endplate, and retighten spring
cap screw until snug. Do not overtighten!
Torque to a maximum of
100 in-lbs.
I. Remove plunger tie-down. Manually
lift solenoid plunger to maximum travel
and release. Complete electrical connec-
tions, (See Section on
Electrical
Connection of Brake .) Depress solenoid
plunger manually or electrically, and allow
it to snap up.
Repeat this process several times to set air
gap on solenoid. (Check
Self-Adjust
Maintenance Section for proper gap meas-
urement, or corrective action for improper
gap.)
J. See Section on Electrical Connection of
Brake .
K. Assemble housing and shaft assembly, rotat-
ing shaft (35) to engage key (35K) into hub
keyway. Be sure housing is assembled with
manual release on right hand (solenoid) side
(looking at output shaft side) or release lever
(148) will not latch. Replace housing bolts
and tighten evenly to 118 lb-ft of torque.
L. Remove access plug (7P). Insert a 3/16 ″
hex wrench and tighten the two set screws
to 290 in-lb. (set screws are located 120
°
either side of the keyway).
M. For reducer application, mount and secure
brake/motor combination to mounting face of
reducer.
For alignment when brake shaft is direct-con-
nected to another shaft by a coupling refer to
coupling manufacturer
′s suggested proce-
dure. Side or overhung load is not permitted.
Consult factory for reversing applications.
II. Electrical Connection of Brake
CAUTION 1: Inverter Motor and Special
Control Systems. This brake contains a single
phase AC coil that requires instantaneous
power within
± 10% of rating at the coil. A sepa-
rate power source is required when this brake
is used in conjunction with a motor or control
system that limits voltage or current input (i.e.
inverter motors) or causes a ramping of the
power supply.
Note 1: Be sure lead wires to coil are not tight
or pinched, and that leads will not be rubbed by
friction disc, trapped between solenoid plunger
and frame, caught between lever arm and end-
plate, or by linkage.
Note 2: See figure 3 for dual voltage coil con-
nection and connect to any two leads of single
or three-phase motor of the same voltage. The
brake can also be wired to external switch con-
tacts providing proper voltage other than that
used to control the motor. Normally, the motor
and brake contacts are interlocked.
Note 3: To use a 230 volt coil (or a 230/460
dual voltage coil connected for 230 volts) with a
230/460 dual voltage three-phase motor, the
brake leads are connected across two motor
terminals as shown, or other equivalent combi-
nations. If a 230 volt brake coil is
2
1 Friction Disc - Vertical Above
Item
No.
No.
Req.
Description
1 3 Blue Vertical Push-in Spring
1
Figure 2A
Figure 2B
2 Friction Discs - Vertical Above
Item
No.
No.
Req.
Description
1 3 Plain Vertical Push-in Spring
2 3 Red Vertical Push-in Spring
2
1
Figure 2C
2 Friction Discs - Vertical Below
Endplate
Item
No.
No.
Req.
Description
1 3 Blue Vertical Push-in Spring
2 3 Red Vertical Push-in Spring
2
1