Altra Industrial Motion Warner Electric PB-250 Installation Instructions Manual - Page 8

Browse online or download pdf Installation Instructions Manual for Industrial Equipment Altra Industrial Motion Warner Electric PB-250. Altra Industrial Motion Warner Electric PB-250 18 pages. Primary brakes

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Burnishing and Maintenance

Burnishing

Intimate metal to metal contact is essential between

the armature and the metal rings (poles) of the magnet

or rotor . Warner Electric clutches and brakes leave the

factory with the friction material slightly undercut to

assure good initial contact .

Normally, the desired wearing-in process occurs naturally

as the surfaces slip upon engagement . The time for

wear-in, which is necessary to obtain the ultimate torque

of the unit, will vary depending on speed, load, or cycle

duty .

If maximum torque is required immediately after

installation, the unit should be burnished by slipping

the friction surfaces together at reduced voltage . It is

recommended that the burnishings be done right on the

application, if at all possible .

Burnishing at high speed will result in a smoother wear-in

pattern and reduce the time for burnishing . The voltage

should be set at approximately 30% or 40% of the rated

value .

The unit should be cycled on and off to allow sufficient

time between slip cycles to prevent overheating .

When a Warner Electric brake or clutch is properly as-

sembled and installed, no further servicing, lubrication,

or maintenance should be required throughout the life of

the unit .

8 Warner Electric • 800-825-9050

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Maintenance

Wear Pattern: Wear grooves appear on the armature

and magnet surfaces . This is a normal wear condition,

and does not impair functioning of the unit . Normally,

the magnet and armature, as a mating pair, will wear at

the same rate . It is the usual recommendation that both

components be replaced at the same time .

Remachining the face of a worn armature is not rec om-

mended . If a replacement armature is to be used with

a used magnet, it is necessary to remachine the worn

magnet face . In refacing a magnet: (1) machine only

enough material to clean up the complete face of the

magnet; (2) hold the face within .005" of parallel with

the mounting plate; and (3) undercut the molded facing

material .001" - .003" below the metal poles .

Heat: Excessive heat and high operating temperatures

are causes of rapid wear . Units, therefore, should be

ven ti lated as efficiently as possible, especially if the

application requires fast, repetitive cycle operation .

Foreign Materials: If units are used on machinery

where fine, abrasive dust, chips or grit are dispelled

into the atmosphere, shielding of the brake may be

necessary if maximum life is to be obtained .

Where units are used near gear boxes or transmissions

requiring frequent lubrication, means should be provided

to protect the friction surfaces from oil and grease to

prevent serious loss of torque .

Oil and grease accidentally reaching the friction surfaces

may be removed by wiping with a rag dampened with a

suitable cleaner, which leaves no residue . In performing

this operation, do not drench the friction material .

P-201-WE • 819-0480