Siemens 1PH818 Operating Instructions & Installation Instructions page 155

Service Instructions NFF
Electromagnetic Double Face Spring – Applied Brake
8 Maintenance
8.1 Maintenance and inspection work
Make sure to comply with Chapter 2 "Safety guidelines" during all maintenance and
inspection work.
As the brakes work under varying operating conditions, it is not possible to pre-define wear
check, inspection, maintenance and repair intervals.
Higher loads on the brake (e.g. as a result of torque, speed, switching frequency, ambient
temperature etc.) require shorter maintenance intervals.
Therefore it is first of all necessary to observe the brake with regard to safety and wear, and
then adapt the maintenance intervals in accordance with the observations made.
Wear of the friction lining will result in a greater air gap „off".
Depending on the load on the brake, the air gap must be checked from time to time. This will be
done by measuring the air gap according to chapter 8.2.
If the max. air gap as determined in chap. 1.1. is reached please readjust the air gap described
in chap.8.3.
Caution!
If wear re-adjustment is not carried out early enough, both the transmission of the rated load
torque and the lifting of the brake will not be ensured.
8.2 Measurement of the air gap
The measurement of the air gap between coil body (1) and armature disc (10) can only be done
when the coil is currentless.
The measurement of the air gap must be taken on two places be opposited 180°. Therefore
remove the two cap screws (65) in the outer body and control with a finger gauge. The air gap
between the armature disc (10) and coil body (1) must be between „off min." and „off max."
described in chap.1.1.
After the measurement the thread hole must be closed with cap screw (65) and sealing ring for
protection of IP 66.
8.3 Wear re-adjustment
When the maximum 'air gap off' has been reached in brakes (chap.1.1) a onetime wear re-
adjustment is possible.
Important! Check up: the brake must be torque-free on the output side.
Disconnect the brake from current.
Proceed as follows (fig. 1)
Stromag Dessau
IP 66
14
safety in motion
01.06.2009
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