General Description, Operating Principle | Stearns 200, 300 instruction

® Spring-Set Disc Brakes

P/N 8-078-925-00

effective 11/6/97

Installation and Service Instructions for Series 55,000; 55,200; 55,300; 55,400; 55,500 and 57,500

Important

Please read these instructions carefully before installing, operating, or servicing your Stearns Brake. Failure to comply with these instructions could cause injury to personnel and/or damage to property if the brake is installed or operated incorrectly. For definition of limited warranty/liability, contact Rexnord Industries, Inc., Stearns Division, 5150 S. International Dr., Cudahy, WI 53110, (414) 272-1100.

Caution

1.Installation and servicing must be made in compliance with all local safety codes including Occupational Safety and Health Act (OSHA). All wiring and electrical connections must comply with the National Electric Code (NEC) and local electric codes in effect.

2.Do not install the brake in atmospheres containing explosive gases or dusts.

3.To prevent an electrical hazard, disconnect power source before working on the brake. If power disconnect point is out of sight, lock disconnect in the off position and tag to prevent accidental application of power.

4.Make certain power source conforms to the requirements specified on the brake nameplate.

5.Be careful when touching the exterior of an operating brake. Allow sufficient time for brake to cool before disassembly.

Surfaces may be hot enough to be painful or cause injury.

6.Do not operate brake with housing removed. All moving parts should be guarded.

7.Installation and servicing should be performed only by qualified personnel familiar with the construction and operation of the brake.

8.For proper performance and operation, only genuine Stearns parts should be used for repairs and replacements.

9.After usage, the brake interior will contain burnt and degraded friction material dust. This dust must be removed before servicing or adjusting the brake.

DO NOT BLOW OFF DUST using an air hose. It is important to avoid dispersing dust into the air or inhaling it, as this may be dangerous to your health.

a)Wear a filtered mask or a respirator while removing dust from the inside of a brake.

b)Use a vacuum cleaner or a soft brush to remove dust from the brake. When brushing, avoid causing the dust to become airborne. Collect the dust in a container, such as a bag, which can be sealed off.

General Description

These series of brakes are spring-set, electrically released. They contain one or more rotating friction discs (4) driven by a hub (16) mounted on the motor or other shaft, except the 55,200 Series which has the hub mounted on a shaft supported by two brake bearings.

Operating Principle

These series contain one or more friction discs (4) assembled alternately between the endplate (2) friction surface, stationary disc(s) (3) and pressure plate (also called stationary disc) (3). The stationary disc(s) are restrained from rotating by being keyed into the endplate. With the brake released, all disc pack components are free to slide axially and the friction disc(s) to rotate.

Brake release occurs when the solenoid coil is electrically energized, causing the solenoid plunger to travel a specified distance and through a lever system, overcoming the pressure spring force. This action releases the clamping force on the disc pack, thereby allowing the friction disc(s) and brake hub to rotate.

Brake sets and torque is produced when electric current to the solenoid coil is interrupted, thereby collapsing the solenoid magnetic field. The solenoid plunger returns to its original de-energized position allowing the lever arm to move forward by virtue of the compressed torque springs. This action compresses the disc pack components which applies a retarding torque to the brake hub and ultimately restores the brake to a spring-set static condition.

Caution! While the brake is equipped with a manual release to allow manual shaft rotation, the motor should not be run with the manual release engaged, to avoid overheating the friction disc(s).

I. Installation Procedure

To remove housing, follow instructions listed under each individual brake series in Figure 2, then continue with the following steps.

A. Method of installing 55,300; 55,500; 57,500 plus 55,000 and 55,400 Brakes with standard enclosure:

1.Remove hub (16) from brake assembly, using caution to preserve alignment of friction disc(s) (4) for ease of brake assembly. Do not operate manual release until brake is installed. When removing hub from brake on multi-disc brakes, check that hub slides freely. If not, file area of discs contacting hub so that discs slide freely without binding.

Note 1: On single-disc brakes the hub may have moved far enough into brake to be locked in by stabilizing springs (161). Remove springs from friction discs, but be sure to replace them in same position and proper location after hub is removed. (Locate at 90° in recessed portion of square hole, with prongs pointing into brake.) Stabilizing springs (161) are only used on single disc brakes with square hub and splined hub with the teeth removed for stabilizing spring clearance.

S-652-1

500, 300, 0, 200, 55 specifications

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