Rexnord Corporation
Stearns Division
5150 S. International Drive
Cudahy, Wisconsin 53110
(414) 272-1100 Fax: (414) 277-4364 www.stearns.rexnord.com
Copyright
©
1998-2013 by Rexnord Corporation
Repairs
The hub is the only replaceable item in this brake.
General
After proper installation, no further adjustment should be
required for the life of the unit.
Full rated torque of a new AAB brake may not develop
until the mating surfaces have been burnished or
run-in.
Power supply
The voltage to be applied is determined by rating shown
on the nameplate. Resistance and other coil data for
various voltages are tabulated on appropriate Engineering
Data Sheets. This data can be secured by contacting the
factory.
Troubleshooting for AAB Brakes
Overheating, coil burned out or loss of torque
1. Check ambient temperature. It is above 40° C? Consult
factory for assistance.
2. Check thermal capacity of unit versus actual heat
dissipation requirements. Consult factory.
3. Check voltage supply as close to coil as feasible.
Compare to nameplate data, if incorrect apply proper
voltage.
4. Is coil resistance correct? Consult factory for resistance
of the specific coil.
Caution:
To avoid damage to power supply, hipot testing
should not exceed 1500 volts for one second. Brake coil
leads must be connected together.
5. Stop time on brake normally should not exceed one
second. If excessive, recheck torque rating versus load
characteristics.
6. Check for oil/grease on friction elements. If this is
found, replacement of entire brake may be required.
7. On pressure spring, check for broken, missing or
substituted springs not of our design.
8. Failure to release after unit has performed satisfactorily
for a period indicates wear has occurred. Replacement
of the brake is required.
Fuse in DC power supply blows
1. Never put in a higher rating fuse or replace with a
slo-blow type.
2. Check resistance of coil, if shorted, replacement of
brake is required. If not shorted, obtain coil resistance
from factory and compare to your reading.
3. If cause was not found in Step 2 above, check rectifier
bridge by removing all loads and replacing fuse. If
fuse blows when AC is applied to rectifier, bridge is
shorted. Replace bridge if feasible or discard control
and replace.
Size
Hub
Position
(inch)
Operating
Range
Air Gap
(inches)
Maximum Allowed
Misalignment (inches)
X
X
1
Parallel
Angular
2.8
.954 .050 .003 to .015
.005
.005
*Size 2.8 can be pressure plate mounted using the long hub.
