Warner Electric Electrically Released Brake ER-375, ER-475, ER-650 - Manual (Page 6)

6 Warner Electric • 800-825-9050 P-253 • 819-0315
Operating Instructions
A worn out Electrically Released Brake can
lose its ability to produce torque. Consequently, it
is imperative that the brake be inspected
frequently for wear and to insure that it engages
and disengages properly. The frequency of
inspections is dictated by usage; a brake used
in a high cycle rate and/or heavy load application
must be inspected more often than one used less
severely. Experience will determine proper
inspection intervals.
The end of normal service will occur when the
armature wears through the friction material and
into the coil, causing an open circuit and failure to
release when voltage is applied. Brake wear is
determined by two checks. The first determines
whether the brake is about to lose torque; the
second ensures that the armature has not worn
through the friction material, endangering the coil.
If either of these checks indicates excessive wear,
the unit should be replaced.
Check No. 1
Examine the three autogap release springs to
assure that none of them are approaching total
compression or if the distance from the
underside of the drive pin head to the top of the
detent cup washer is less than .062 inch, the
brake should be replaced.
Must be greater
than .062 inch
Step indicating
friction material
thickness
Check No. 1
Check No. 2
A step is machined on the O.D. of the brake
magnet where the armature and magnet meet.
This step is equal to the friction material thickness.
When this step is completely covered by the
armature with the brake engaged, the brake is
worn out and should be replaced.
Magnet worn to Step
Check No. 2
New Worn Out
After completing an inspection with the
machine turned off, cycle it several times. If
the Electrically Released Brake stopping time
has more than doubled since the original set-up,
this also indicates the brake is worn out and
should be replaced.
Foreign Materials: If units are used on
machinery where fine, abrasive dust, chips or grit
are dispelled into the atmosphere, a protective
screen over the unit may be necessary.
Where units are used near gear boxes or
transmissions requiring frequent
lubrications, means should be provided to
protect the friction surfaces from oil and
grease to prevent serious loss of torque by
reducing the co-efficient of friction and
swelling the friction material.
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.
The drive pins should be kept free of foreign
materials to ensure proper function of the brake.