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TVL 351
ISSUE 15
Appendix H: Limax3CP UCM Testing (only if fitted)
Procedure to test the UCM (unintended car movement) detection facility on the
TVC Ethos control panel when used with the Dual Brake interface.
Application of Dual brake 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 Dual Brake Monitoring
Self-monitoring functionality in the Ethos Two control panel for the verification of the correct sequence of the Dual
Brake signals as part of the unintended car movement protection of the lift.
To test the Dual Brake monitoring feature, perform the following:
a) Starting: Remove BLC1 signal to the Ethos 2 prior to the starting sequence.
The Ethos Two will log a “Brake Fail, Starting” event.
b) Moving: Remove BLC1 signal to the Ethos 2 whilst the lift is running.
The Ethos Two will log a “Brake Fail, Moving” event.
c) Stopping: Link the BLC1 input to +ve feed whilst the lift is running.
The Ethos Two will log a “Brake Fail, Stopping” event once the lift stops.
d) Repeat the above steps for the BLC2 input.
Three consecutive “Start” or “Moving” failures will invoke a “Brake Confirm Fail” event; a single “Stopping”
failure will invoke the same event.
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 to reset the lift.
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