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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 Bucher iValve.
Application of UCM/A3 valve as unintended car movement stopping element in the Ethos Two control panel system
for hydraulic 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
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 downwards 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 Bucher iValve SMA Monitoring
Self-monitoring functionality in the Ethos Two control panel for the verification of the correct sequence of the SMA
signal as part of the unintended car movement protection of the lift.
To test the SMA monitoring feature during the starting and stopping states perform the following:
a) Starting: Link SI2 to MSA during the starting sequence.
The Ethos Two will log a “iCon SMA Monitor Fail” event.
b) Stopping: Remove the SI2 input during the stopping sequence.
The Ethos Two will log a “iCon SMA Monitor Fail” 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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