OPERATING MANUAL NBS PRODUCT DESCRIPTION
ThyssenKrupp Aufzugswerke GmbH
2.2.3 Initiating a run
Before initiating the run, the elevator control system checks whether the NBS
contactor release monitoring is closed. If the NBS contactor release
monitoring is closed and the elevator control system has met all the other
conditions for initiation of a run (safety circuit closed), a run can be initiated
by the elevator control system.
Initiation of a run is signalled by the elevator control system to the NBS
emergency brake control system in that the elevator control system applies a
voltage of 230 V~ to contactor coil +NBS-K77.3. Contactor +NBS-K77.3
picks up.
If the contactor +NBS-K77.3 picks up, this makes contactors +NBS-K77.11
and +NBS-K77.2 pick up as long as the safety circuit of the elevator control
system is closed. This connects the brake magnet +M-Y78 to the brake
voltage output of the component ROBA switch +NBS-G77.1:5-6. This
enables the brake activation voltage (207V DC) and after a time set in the
component +NBS-G77.1 it is reduced to a brake retentive voltage
(104 V DC). This releases the NBS emergency brake and holds it open.
The time up to switching over to retentive voltage is specified by resistor
R77.2 on +NBS-G77.1. The value 1M Ohm sets approx. 1.2 seconds.
On release of the NBS emergency brake, monitoring switch +M-S78 is
opened. This causes relay +NBS-K77.4 to drop out and contactor +NBS-
K77.5 picks up. Indicator lamp H77 shows that the NBS emergency brake
has been released.
+NBS-K77.5 checks the brake test switch for each run.
If the NBS emergency brake is not released, contactor +NBS-K77.5 is also
without current and has dropped out. The contactor contact chain between
+NBS-X2:14 and +NBS-X2:15 is then interrupted. The elevator control
system must ensure that the drive is no longer moved under the closed NBS
emergency brake. If the NBS emergency brake engages while the elevator is
moving, interrupting the contactor contact chain withdraws the run enable by
the NBS emergency brake control system, which means the elevator control
system must immediately trigger an emergency stop.
If the contactor contact chain between +NBS-X2:14 and +NBS-X2:15 is
closed, the NBS emergency brake control system enables the run. Following
run enable from the NBS emergency brake control system, the elevator
control system can start the run.
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