New lift FST-2XT Manuel De Montage page 134

1 Scope of application
The test items are the FST 5 00 (FST-2XT) printed circuit board as "lift control system"
and FSM 5 20 (FSM-2) printed circuit board as "car top control module" with electronic
components, taps in the safety circuit and safety circuit bypass control (FST 5 00) as well
as subsystem as element for detecting unintended car movement. Also tested are the
clearance and creepage distances of the FST 5 00 and the FSM 5 20 as well as the safety
circuit scan control of the FST 5 00.
1.1 Function of the safety circuit
The safety circuit bypass control consists of the K21, K22 and K23 safety relays.
The SHS_ZOFR (+24V) zone release signal must be activated by the controller. A zone
release is active if necessary, i.e., if the controller is to open the car door on the corre-
sponding floor.
First, K21 must be energized; for this purpose, K20, K22 and K23 must be de-energized.
K21 holds itself as long as K20 is not energized and there is a zone release.
K23 can only be energized after K21 if zone switch B closes. K23 holds itself as long as
zone switch B is closed.
K22 can be energized after K23 and K21 if zone switch A closes. K22 holds itself as long
as zone switch A is closed.
If K23 and K22 are energized, K20 can also be energized as soon as the controller starts
the bypass release (0V). This, however, only occurs as needed and if the car speed is
<0.3m/s. Not until K20 energizes does K21 de-energize. The door bypass is now active
and remains so until the bypass release is cancelled and K20 is de-energized again.
K22 and K23 are not de-energized until switches A and B are opened again due to a drive
outside of the door zone.
by energizing K21 as soon as the controller switches a renewed zone release. Transistor
T2 is used for resetting relay K22 after a power failure.
In the event of failure of the operating voltage, zone switch A continues to be supplied via
auxiliary power supply HSG, allowing the door zone to be detected should freeing be nec-
essary. At the same time, T2 switches K22 and K23 off so that when the operating voltage
is restored, the switching sequences can be completed as described.
Manuel de montage et de mise en service FST-2XT FST-2XTs
Annex to the EU Type Examination Certificate
No. EU-ESD 023 of 2016-10-04
Only if both relays are de-energized can another cycle begin
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