OPERATING MANUAL NBS PRODUCT DESCRIPTION
ThyssenKrupp Aufzugswerke GmbH
Where contactors +NBS-K77.1, +NBS-K77.2 and +NBS-K77.5 drop out, the
contactor contact chain between +NBS-X1:14 and +NBS-X1:15 is
interrupted. The elevator control system must immediately switch off the drive
if the contactor contact chain between +NBS-X2:14 and +NBS-X2:15 is
interrupted.
2.3 Placing the NBS emergency brake out of operation
As monitoring of the NBS emergency brake is integrated in the safety chain
of the elevator control system, special measures are required to open the
NBS emergency brake and/or put it out of operation in certain situations such
as emergency rescue, safety gear test, brake test etc.
NB: the work described here may only be performed by qualified personnel.
It must not be performed by the elevator attendant, as in the event of
malfunctions only trained and qualified personnel are able to recognise the
causes and the associated dangers involved in the removal of the
malfunction and reconnection.
2.3.1 Opening the NBS emergency brake with power supplied to installation
(after activation of the brake as a safety device as a result of overspeed or in
the case of UCM)
Check the function and operability of the drive brake and drive. Perform a
visual inspection to see whether there are any discernible faults or if any
safety devices are broken / disconnected. Reset the switches and speed
governor to their operating positions.
a) With functioning drive brake: set switch on the control unit of the NBS to
"Open". This electrically releases the NBS emergency brake. Run
emergency rescue with manual release of the drive brake (same as for drives
without NBS).
b) If the drive brake is defective: move the elevator car by briefly opening and
closing the switch on the control unit.
c) With triggered safety gear: pull the elevator car out of the safety gear with
recall. Rest of procedure as described at a).
Note: driving the elevator car with the motor is not possible when the NBS
brake switch is opened. (See type test certificate in Appendix.)
NB: every time the NBS emergency brake is activated, the cause of activation
of the emergency braking device is to be determined before reconnection of
the drive and, if possible, rectified.
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