Warner Electric ER 825 and 1225 Heavy Duty - Manual (Page 7)

7 Warner Electric • 800-825-9050 P-251 • 819-0121
After completion of installation procedure
and brake control adjustment it may be
necessary to burnish (wear in) the brake in
the application.
Note: The brake is pre-burnished at the factory
but during the installation and handling of the
brake, static torque may have been affected.
Therefore, burnishing on site is recommended.
Step 11:
Burnish the brake as follows: This step
requires you to run the machine that brake is used
in. Observe all safety rules and regulations for your
facility. Using the brake as the primary stop
device, start and stop the brake 30 times. Allow
5-10 seconds delay between Start and Stop.
During torque measurements
machine power should be turned off and
properly locked out.
Step 12:
With the brake fully engaged, attach
torque wrench to the end of the brake shaft. Hold
the wrench at the handle, and pull it in the
direction of motor rotation in one continuous
motion (without any jerky motion) until shaft
movement is detected. The highest reading on the
dial is the static torque of the brake. This torque
without any system drag must be at least 400 lb.
ft. for ER-1225 and 125 lb. ft. for ER-825. If less,
burnish the brake again, repeating Step 11. If the
brake does not meet the torque requirement after
two burnishing procedures, replace the brake.
The brake installation procedure is now
complete.
Section III
Disassembling the Armature/Hub
Assembly
(Figure 3)
Do not pry the armature away
from the magnet. If armature is
distorted the entire brake must be replaced.
Note: Steps (1) and (2) are to be performed at
the brake.
Note: Make sure power to the brake is turned
off. See Figure 3 for the following two steps.
Put machine in a safe
condition so that when voltage
is applied to control and switch closures are
made the brake does not rotate and machine
does not run.
Step 1:
Loosen the taper-lock bushing (item 5) on
the brake shaft.
To loosen, remove both hex screws from the taper
lock bushing (item 5, figure 3) using a hex wrench.
Insert the hex screws into the
previously vacant taped holes in the taper lock
bushing and tighten these screws until the
bushing is loosened in the hub (item 2). If the
bushing does not loosen, tap on the bushing with
a drift and small hammer.
Step 2:
Apply power to the brake. The armature
will then spring away from the magnet. If it does
not, check electrical connections and release
voltage. Remove taper lock bushing (item 5) and
armature assembly (items 2 & 3) from the brake
shaft. Set the bushing aside. Do not discard the
bushing.
Note: If reinstalling armature assembly, follow
steps 1 thru 7 in the assembly procedure.