Safety Function Check
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12.9
Final Limit Switches
First, the auditor displays the offsets for the top and the bottom final limit switches, see chapter
auditor also displays the positions of the highest and lowest floors stored in LIMAX Safe SG/SC. With this infor-
mation, the auditor calculates the position of the lower and upper final limit switches.
The auditor takes the elevator to the top floor by car call. From here, he begins to move the cabin slowly up-
wards- generally this will be done with recall panel – until a point just under the top final limit switch.
The auditor switches off recall so that by measuring the voltage behind OC he can determine if the contact is
open. First the auditor waits for 10 sec because it is possible that the deceleration control was triggered – open-
ing OC - while the car approached the final limit switch.
After a 10 sec wait, safety function “deceleration control” is reset. Now the auditor measures the voltage behind
OC. Here, the normal safety circuit voltage must exist (OC closed).
The auditor now over travels the position of the upper final limit switch (by recall panel) by the shortest possible
distance, switches off recall and waits for 10 sec (see above). Now he checks the voltage behind OC. There
must not be any voltage as OC must be open. The auditor measures the voltage before OC as to crosscheck.
The normal safety circuit voltage must exist.
The lower emergency limit switch can be tested by the same procedure.
12.10
Inspection
The auditor then switches the lift to inspection and checks the resistive continuity between OC-IN and OC-OUT.
OCand NOC must be open. By using an inspection direction button, the auditor drives the lift for half a meter
in up and down directions in order to check that the lift moves in the correct direction.
In case of discrepancies in this test, the wiring of the inspection control is checked and corrected if necessary.
12.11
Inspection Limit Switches
First the auditor checks the offsets for the upper and lower inspection limit switches (see chapter
The auditor drives the cabin upwards in inspection mode by using the direction button ‘UP’ until OC and NOC
open after the lift has reached the upper inspection limit switch and the lift stops. The auditor checks the resistive
continuity of OC. This contact must remain open both when the ‘UP’ button is pressed and if both buttons are
released.
The auditor determines the distance from the position where the elevator stopped and the top floor and checks if
the distance matches with the offset of the upper inspection limit switch.
Now the auditor presses the ‘DOWN’ button, after which OC and NOC close and the cabin drives back in the
safe zone.
The auditor drives the cabin downwards in inspection mode by using the direction button ‘DOWN’ until OC and
NOC open after the lift has reached the lower inspection limit switch and the lift stops. The auditor checks the
resistive continuity of OC. This contact must remain open both when the ‘DOWN’ button is pressed and if both
buttons are released.
The auditor determines the distance from the position where the elevator stopped and the lowest floor and
checks if the distance matches with the offset of the lower inspection limit switch.
Now the auditor presses the ‘UP’ button, after which OC and NOC close and the cabin drives back in the safe
zone.
