OPERATING INSTRUCTIONS AND DATA SHEET
FOR SAFETY CONTROLLER REA3
Safety switch REA3
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Date:
17.08.2017
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Page 7 of 12
Variotech GmbH, Gewerbeweg 5, 2230 Gänserndorf, Tel +43 2282 60310, http://variotech.com
Variotech GmbH, Gewerbeweg 5, 2230 Gänserndorf, Tel +43 2282 60310, http://variotech.com
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1x LED with the designation “SK” indicates when the safety circuit voltage is connected to terminals
9 and 10 (door switch closed). This LED must illuminate when the doors are closed and locked and
the safety circuit is locked.
TEST button on the circuit board: Pressing the button triggers an internal test that checks to ensure
the correct function of the device and an adequate supply voltage (24V).
Possible sources of error:
Monitoring of the magnetic switch function:
1. The safety circuit is closed
-- voltage is connected to terminals 9 and 10:
If the doors are closed, the UCM monitoring function is not active.
However, the magnetic switch monitoring is active and a possible magnetic switch error is detected
and recorded.
Note: When passing through a stop or when the cabin stops, both magnetic switches must always
activate on a magnetic tape and if no magnetic tape is present, both magnetic switches must
deactivate. If a magnetic switch does not deactivate or activate, it is recognised as an error. The
switching time delay between signals MS1/MS2 must be 1 second; otherwise, this is also recognised
as an error and recorded.
The REA3 safety switch will then deactivate and shut down due to the recorded error when the next
safety circuit opens.
Therefore, deactivation in case of a magnetic switch error does not take place during travel and only
occurs after travel, when the cabin stops and the door opens (at a stop).
Comment: The safety switch cannot be reactivated as long as a magnetic switch error is present.
2. The safety circuit is open in a door zone (door contact and/or bolt contact) --
no voltage
is connected to terminals 9 and 10:
Comment: The magnetic switches can be activated or deactivated, depending on the position of the
cabin.
It is assumed that the lift does not move with an open safety circuit and/or open door. Consequently,
each change of the switching status of the magnetic switch with an open safety circuit is considered an
error and the safety switch deactivates.
The same applies in an actual case of UCM: If the magnetic switches deactivate with an open safety
circuit because the cabin has left the door zone, it is recognised as a UCM error and the safety switch
deactivates. In this connection, it unimportant whether only one magnetic switch deactivates or both
switches deactivate simultaneously.
It is only possible to reset an error by pressing the reset button.
A loss of supply voltage does not trigger a reset.
Comment: The safety switch cannot be reactivated as long as a magnetic switch error is present.
Monitoring of the reset button:
Possible error:
The reset button remains pressed or the reset button conductor has short-circuited.
Situations where recognition of a UCM error is prevented due to a defective reset button or the UCM
error is recognised but the error recording does not work must be avoided.
