Stearns 1-048-151 Benutzerhandbuch

Copyright© 2000 by Rexnord Industries, Inc.

Rexnord Industries, Inc., Stearns Division, 5150 S. International Drive, Cudahy, Wisconsin 53110
(414) 272-1100   Fax: (414) 277-4364  www.rexnord.com

11. Is brake coil energized at same time

or prior to energization of motor, and
de-energized at same time or after
de-energization of motor?

12. Is stopping time more than one

second (rule of thumb) and/or is
application more than five stops per
minute? If so, consult factory. Check
thermal requirements of load versus
thermal rating of brake.

13. Replace friction disc when worn area

is one half of original thickness of
3/16”.

1. Voltage supply at coil versus coil rating

and connection.

2. Is solenoid air gap excessive?

3. Shading coils may be broken.

4. Plunger guides may be excessively

worn. Does solenoid plunger rub on
solenoid frame laminations?

5. Solenoid frame and plunger may be

excessively worn.

6. Is solenoid dirty?

7. Housing studs may have become loose

causing frame to shift and plunger to
seat improperly.

8. Does solenoid linkage move freely?

9. Check for excessive voltage drop in

motor line when motor is started.
Check wire gauge of supply line
against motor starting current and
solenoid inrush current. Measure
voltage drop at solenoid coil leads
during maximum inrush current
condition. To accomplish this, connect
voltmeter at brake coil. Insert a block of
wood, or other non-magnetic material,
between solenoid plunger and frame.
Block thickness should approximately
equal solenoid air gap. Energize motor
and brake simultaneously, take reading
and immediately shut down. (This is to
prevent motor, brake, or solenoid burn
up, since brake will be set during
procedure.)

1. If friction disc (4) becomes noisy, check

stabilizing spring (4A) to be sure it is
installed.

2. Check that the leaf spring (5A) is

supporting stationary plate (5). If
distorted, replace.