Warner Electric ER-1225 - Manual (Page 17)

Warner Electric • 800-825-9050 819-0466 17
MAINTENANCE INSTRUCTIONS: All
Brakes
Once an electrically released brake is properly
installed, periodic checks of the brake for
worn out conditions are required. Experience
will determine the proper inspection interval .
Furthermore, in order to refresh the mating
surfaces, it is recommended that burnishing
as described in the installation procedure be
performed once a month .
Check for worn out conditions as follows:
Figure 23 - Measure dimension “X’’ to
determine worn out condition.
Turn off power to the brake . The armature must
contact magnet all around the circumference
and there should be no airgap between armature
& magnet . If there is partial or no engagement,
replace the brake . Check the combined thickness
of the armature and magnet as shown in Figure
23 - “dimension X” . If this dimension is less than
or equal to 2 .420” (2-27/64”) for size ER-825 or
2 .875” (2 -7/8”) for size ER-1225, then the brake
is worn out and should be replaced immediately .
Discard all the brake components and do not use
any of them with the new brake .
After completing an inspection with the machine
turned off, perform the normal burnish procedure
used during installation of a new brake . Check the
static torque of the brake . If the torque is below
the rated level, perform the burnish procedure
again and check for rated torque . If torque falls
below the rated level, replace the brake .
Check the air gap: When the armature is rotating
freely in a released mode, the armature working
face should not rub on the magnet working face .
Armature working face axial runout (wobble)
should not exceed .015 inch . If any of the above
conditions are present, remove the armature
assembly from the motor brake and reassemble
it on the motor as explained in the installation
procedure . If problem persists, replace the brake .
Wear pattern: Wear grooves will appear on the
friction surfaces . This is a normal wear condition,
and does not impair the performance of the unit .
Never machine the friction surfaces to remove
grooves or score marks resulting from normal
wear .