OPERATING MANUAL NBS PRODUCT DESCRIPTION
ThyssenKrupp Aufzugswerke GmbH
2.2.4 End of run
A run is normally terminated after a regulated delay in that the direction of
travel and run signal are switched off by the elevator control system. The run
ends immediately (emergency stop) if the safety chain is interrupted in the
event of a malfunction.
At the end of the run, the power supply to contactor coil +NBS-K77.3 must be
cut immediately by the elevator control system. Contactor +NBS-K77.3 drops
out. The delayed auxiliary switch block of the contactor +NBS-K77.3 drops
out after the set time.
As long as safety switch +T-S102.1 and the safety circuit of the elevator
system are closed, the NBS emergency brake should open without delay and
close with a delay. The delay of the auxiliary switch block +NBS-K77.3, which
can be set from 0.1 to 30 seconds, should be set in such a way that the NBS
emergency brake only engages when the drive is at a standstill and the
service brake firmly brakes the drive.
As soon as contactors +NBS-K77.1 and +NBS-K77.2 are without voltage and
have therefore dropped out, the brake magnet +M-Y78 is disconnected from
the brake voltage. The NBS emergency brake engages. The initial situation is
reached once again.
The dropping out of the NBS contactors K77.1, K77.2, K77.3 must be
checked by the elevator control system for each run or at the latest during a
change of direction. This contactor chain is available for the check at
terminals X2:11 and X2:12.
2.2.5 Emergency braking
The NBS emergency brake is activated via an additional safety switch
+T-
S102.1 at the speed governor of the elevator at overspeed independently
of the direction of rotation of the drive.
The safety shutdown of the drive at overspeed takes place via the regular
safety switch (e.g. +T-S102) of the speed governor. This safety switch is part
of the safety circuit of the elevator control system.
If the additional safety switch +T-S102.1 is opened, contactors +NBS-K77.1
and +NBS-K77.2 are without voltage and drop out. This disconnects the
brake magnet +M-Y78 without delay from the brake voltage so that the NBS
emergency brake engages and brakes immediately.
Each opening of the safety circuit also leads to contactors +NBS-K77.1 and
+NBS-K77.2 dropping out and to undelayed engaging of the NBS emergency
brake.
The door safety circuit is usually bridged by a safety module on levelling at
the landing or relevelling. The bridging is permitted complying with EN81 in a
defined door zone and at a speed lower than 0.8 m/s.
To comply with the requirements of EN81-A3, the permitted length of the
door zone has to be calculated. It is only on leaving the door zone with an
open elevator car or landing door that contactors +NBS-K77.1 and +NBS-
K77.2 drop out and the emergency brake engages to brake the elevator car.
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