13.2.5 Unintended Car Movement (UCM)
Three conditions must be fulfilled for causing door over-bridging (SR1/SR2 close) 13.2.4:
1. Door over-bridging (for levelling or re-levelling) must be enabled by CAN: “CAN-condition”
2. Speed must be below 0.8 m/s for levelling resp. 0.3 m/s for re-levelling: “speed-condition”
3. Position must be in the levelling resp. re-levelling zone of the correct floor: “zone-condition”
Otherwise SR1/SR2 opens.
If “CAN-condition”, “speed”-condition” and “zone-condition” are all fulfilled (and therefore SR1/2 is/ are
closed) and then “speed”-condition” or “zone-condition” is hurt (levelling resp. re-levelling speed exceeded or
levelling resp. re-levelling- zone is left) unintended car movement (UCM) is triggered.
If UCM is triggered, all SR1/2 and OC will open. Whether eSGC opens depends on the concerning configura-
tion and on the direction of the movement which caused UCM to trip 14.1.4.
If UCM is triggered, this state is stored in a non-volatile way: The corresponding relays will also be kept open
after a power cycle. This state is cleared by manual reset by RESET (by CANopen).
If the car is on a floor level with doors bridged (SR1 or/and SR2 closed) lift control must always disable door
bridging by CANopen, before a new travel can start. Otherwise UCM would be triggered.
Refer also to Figure 21.
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