Warner Electric FB-375, 475, 650 - Manual (Page 7)

7 Warner Electric • 800-825-9050 P-237 • 819-0289
1. With the brake power on, pull gently on the
O.D. of the armature to separate it from the
magnet by a 1/32-inch or greater airgap.
Do not pry. This could damage the
components.
2. Slide the detent spring retainer on each drive
pin until it bottoms against the carrier.
If armature cannot be moved, check voltage
and polarity. (See Operating Instructions “Fails
to Release” on page 8.)
3. Push against the drive pins to push the
armature into contact with the magnet.
4. Release the drive pins and the armature will
spring back approximately 1/32-inch. The
armature gap will now be provided by the
autogap mechanism.
Keep fingers clear of area
between the magnet and the armature
because the armature will be pulled sharply
toward the magnet if the release voltage is
altered for any reason.
Detent Spring
Retainer
Carrier
Armature
Armature Spring
Back 1/32-Inch
Magnet
Detent Spring
Drive Pin
Figure 6
Must be greater than
.062 inch
Step indicating
friction material
thickness
Check No. 1
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. If any one of them is 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.