Warner Electric ER 825 and 1225 Normal Duty - Manual (Page 10)

10 Warner Electric • 800-825-9050 P-250 • 819-0122
Section VI
Operating Instructions
When an Electrically Released Brake is properly
installed, no further servicing, lubrication, or
maintenance should be required throughout the
life of the unit.
A worn out Electrically Released Brake can lose its
ability to produce adequate 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. Sound maintenance practices will
determine proper inspection intervals.
Torque loss can result if the armature and magnet
wear extensively enough to cause the detent to
move off the end of the hub spline, resulting in a
loss of the autogap function. 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 assures 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
Measure the distance from the armature hub to
the back of the drive bushing in the armature. If
this dimension equals or exceeds .281 inch
(7.14mm), the armature must be readjusted.
Disassemble per Section III Steps 1 & 2 and
relocate brake armature as indicated starting with
step 1-7.
Check No. 1
Check No. 2
The remaining wear life of the friction surfaces can
be estimated by checking the step machined on the
O.D. of the brake magnet where the armature and
magnet meet. This step is approximately equal to
the friction material thickness. When this step is
completely covered by the armature (worn down)
with the brake engaged, the brake is worn out and
should be replaced.
Check No. 2
Note: New Autogap Assemblies should also be
installed when the armature and magnet are
replaced. Reusing the old Autogap Assemblies
may prevent the armature from fully engaging the
magnet, resulting in torque loss.
Foreign Materials: If units are used on machinery
where fine, abrasive dust, chips, oil or grit are
dispelled into the atmosphere, a protective screen
around the unit is necessary.
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 contamination (contact) to
0.281
(7.14)
Max.
New Worn Out
Magnet Worn
to Step