Справочник Пользователя для Stearns 1-048-151

pressure spring force against the
stationary plate and friction disc, stopping
and holding the load.

Warning! Any mechanism or load held in
position by the brake should be secured
to prevent possible injury to personnel or
damage to equipment before any
disassembly of the brake is attempted or
the manual release lever is operated on
the brake.

When the motor is off and the load is to
be moved without energizing the motor,
the manual release lever can be rotated
90° away from the mounting face. This
removes the retarding torque from the
motor shaft, allowing the load to be
moved. The brake will remain in the
manual release position until the release
lever is returned manually to its 

set

position, or until the brake is re-energized
electrically and the release lever returns
to its 

set position automatically.

Note: The motor should not be run with
the brake in the manual release position
to avoid overheating of friction disc.

Brake mounting can be in any position.
Brake is mounted with two 1/4” flat head
socket cap screws mounted 180° apart.

1. Remove housing nuts (15) and housing

(7) or (7A).

2. Remove hub (16) from brake and slide

onto motor shaft and key (not
furnished) to within 3/16” of motor
mounting surface. Torque both set
screws to 33 lb-in of torque.

Note: Check motor mounting face 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”.

3. Attach brake to mounting surface by

sliding the brake friction disc (4) onto
hub (16), engaging without force. Brake
endplate (2) is to be tight against
mounting face.

4. Mounting the brake to the mounting

surface with two 1/4” flat head socket
cap screws (not furnished). Notches
are provided in the friction disc for
accessibility to the mounting holes.
Torque to screw manufacturer’s
recommendation based on materials
being used. Screw heads may not
protrude above wear surface. Brake
mounting can be in any position.

5. Verify solenoid air gap is 1/8”. Push in

plunger and allow it to snap out. Check
air gap. For vertical above motor
mounting, see Note in 

Wear

Adjustment Section. If adjustment is
required, see

Wear Adjustment.

6. See 

Electrical Connection for coil

connection.

7. Replace housing.

The brake is factory set for nominal rated
torque. No further adjustment to increase
torque may be made. The approximate
compressed torque spring length to
produce nominal rated torque is given in
Table A.

To increase stopping time on 3 and 6 lb-ft
brake, turn torque adjusting nuts (18)
counterclockwise equal amounts to
increase spring length. Spring studs
equipped with flats on the end are for a
wrench if the studs loosen during torque
adjustment. For the 3 and 6 lb-ft brakes,
one full turn on the nut will reduce the
nominal torque approximately 15%. Do
not reduce torque to less than 50% of
nominal rated. Torque for the 1.5 lb-ft
brake may not be reduced.

CAUTION 1: Inverter Motor and Special
Control Systems. This brake contains
either a single phase AC coil or DC coil
that requires instantaneous power within
± 10% of rating at the coil. A separate
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.

CAUTION 2: Class H coils with terminals.
Do not bend lead wire crimp connection
as this causes a fatigue in the metal
which may break under vibration.

Note 1: Brake coil connections described
here cover common motor connections.
For nonstandard motor or control

connections contact respective supplier or
Stearns Division.

Note 2: 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 endplate, or by
linkage.

All coils are single-phase alternating
current (AC).

Connect coil (12C) to any two wires of a
single-phase or three-phase power source
of appropriate voltage. For operation with
a motor control, connect to any two motor
leads with correct voltage.

Preconnect coil for appropriate high or
low voltage as shown in Figure 3. On
these coils observe the lead numbering
sequence for proper connections as
follows:

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 combinations. If a 230
volt brake coil is connected as shown in
Figures 4 or 5, the motor can be operated
on either 230 volts or 460 volts with no
effect on brake operation.

1. Warning! Any mechanism or load held

in position by the brake should be
secured to prevent possible injury to

1.5

3
6

1

15/16

1-1/8

Figure 2

Figure 3

3 and 4

2

1

High voltage

–

2 and 4

1 and 3

Low voltage

Figure 4

Figure 5