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TVL 351
ISSUE 15
Procedure to test the UCM (unintended car movement) detection facility on the
TVC Ethos control panel when used with the A3 Over-Speed Governor Solenoid interface.
Application of A3 Over-Speed Governor Solenoid interface as unintended car movement stopping element in the
Ethos Two control panel system for traction lifts. This system uses the Limax3CP device for door bridging/door zone
circuit and to detect UCM.
Field tests as requested by clause 6.3 of EN 81-20 can be performed to check the correct operation of the detection
for upwards and downwards stopping elements and to verify the correctness of the self-monitoring.
The test shall be carried out with the fully loaded car located one floor above the lowest and with the landing doors
closed and locked. During the field test the car is forced to execute a movement while the doors are open
(preferably simulated or otherwise safely organized). As soon as the car leaves the door-zone, the stopping
elements shall be activated and hold the car.
To test this element of the system, perform the following checks:
a) Using the Ethos Two “Limax Status/testing” menu in the checklist screen, activate the “Door Disable” button.
This will prevent the doors operating.
b) Press the “SR1 UCM Test” button, then activate either a “Top Floor” or “Bottom Floor” call. This will initiate a
journey.
c) When the lift car is moving the Limax3CP should detect the UCM state once the car leaves the door zone. It
will drop its OC and SR1 outputs to signal the motion contactors to de-energise immediately to drop the
brake coils and the lift motor (via the safe torque off signal).
d) The Ethos Two will log a “Limax3CP OC Contact Open” event which is manually resettable via the solutions
menu in the Ethos 2.
e) This simulates the situation when the car has unintended movement outside the door zone whilst the car
has its doors open.
Testing OSG coil Monitoring
Ethos Two control panel functionality to operate the over-speed governor solenoid activation and the verification of
the correct opening and closing of the solenoid as part of unintended car movement protection of the lift.
To test the verification of this feature, perform the following tests:
a) Before the lift goes on a journey remove the “SGS” input to the panel or Ethos Two. Ethos will log a
manually resettable event “Safety Gear Operated” this can be reset via the solutions menu.
b) To prove the OSG solenoid is dropped prior to a journey remove the OSG switch wire from BC4
terminal. The Ethos will timeout during the start and log a “Drive Start Fail” event. This simulates OSG
solenoid failure to de-energise.
c) Prior to starting a journey remove the OSG switch wire in the BC1 terminal, the Ethos will timeout during
the start and log a “Drive Start Fail” event. This simulates OSG solenoid failure to energise.
d) To prove failure of the OSG solenoid to lift: Prior to starting a journey remove the OSG solenoid wire
from SGC terminal, the Ethos will timeout during the start and log a “Drive Start Fail” event.
e) These tests will prove the OSG solenoid and its contacts are operating correctly.
f) Isolate the panel from the main supply, switch the Handwind switch ON, Check A3 OSG solenoid is
energised. (This will allow authorised persons to handwind / release trapped passengers without
engaging the safety gear)
Following any of the above tests, the UCM detection status is stored in a non-volatile memory and is cleared only
when the lift maintenance engineer selects the related menu in the Ethos in order to reset the lift.
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