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2.4
ELECTRIC BRAKE
The electric brake is a two-piece unit consisting of an Armature Plate assembly and a Brake
Housing. The Brake Housing is mounted directly to the motor end bell and the Armature Plate
assembly is fastened to the motor shaft via a set screw in the assembly collar. An air gap of 0.015"
minimum, 0.020" maximum must be maintained, between the Armature Plate Assembly and the
Brake Housing, to ensure proper operation of the brake. The air gap is factory set to 0.015" and
will very gradually increase as the brake wears. The brake should be inspected periodically to
ensure the air gap is maintained. If an air gap adjustment is necessary, remove the set screw
using a 2.5 mm Allen wrench and apply a single drop of Loctite® 243 to the threads and reinsert
it loosely into the collar. Set the air gap to between 0.015" and 0.020", using Siemens' brake
adjustment shims (part number NYK:074070-C and NYK:074070-D) or two automotive feeler
gauges (one on either side of the motor shaft) and fully tighten the set screw in the collar. Refer
to the following figure.
Use a 2.5mm Allen wrench
to remove and apply a single
drop of Loctite 243 applied
to set screw threads.
0.015" min.
0.020" max.
air gap.
SIG-QG-21-01
Version: A
Figure 2-2 Electric Brake Detail
2-3
ENTRANCE GATE
NOVEMBER 2021
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