OPERATING MANUAL NBS MAINTENANCE
ThyssenKrupp Aufzugswerke GmbH
7.2 Replacing the brake test switch
The purpose of the microswitch on the brake magnet of the NBS is to monitor
the brake function. If the switch is defective, it is to be replaced.
Unscrew the protective cover on the brake and remove the switch connection
at the terminal box.
Remove the securing bolts on the switch; replace the defective switch with a
new switch and secure. See Fig. 3.1.1, item 6
Setting the brake test switch
See Mayr documents in the Appendix
Plant setting and functional testing of the microswitch (6.1)
See Warner documents in the Appendix
Setting the microswitch (4.2)
Check the faultless function of the brake test switch setting by operating the
brake a number of times
Mount the protective cover on the brake; tighten the bolts with the prescribed
tightening torque. (Specified tightening torque depends on the gear drive
type)
Adjusting screw
Armature base plate
Brake magnet
Microswitch
Switch connection
Fig. 7.2.1
1
2
Air gap
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