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Atwell International Limited
The UMD-SRB01 control box has factory set coding that allows it to receive
2 types of pulse counts from the UMD-SP01, these are the slow speed count
and the high speed count. The reason for this is to provide 2 different types of
movement detection.
1. Slow Count – This is to monitor for slow creep away from the landing level
with the doors open, this could also be referred to as the trip hazard.
2. High Count – This is to monitor for sudden explosive movement away from
the landing floor with the doors open, this could be as a result of a sudden
loss of traction.
The slow speed counter is also able to distinguish directional movement so will
not cause false tripping should there be lift bounce when passengers enter and
exit the lift car.
As each count equates to 3.142mm of movement, the factory settings are as
follows:
Slow speed count = 25 (25 x 3.124 = 78 mm +/- 50 mm)
High Speed count = 80 (25 x 3.142 = 250 mm +/- 50 mm)
These parameters are variable and should they require changing please contact
Atwell International for details.
To prevent the false activation of the rope brake should a door lock be tripped
whilst the lift car is in flight, the controller has an inbuilt time delay of 0.1 seconds
before registering the count, as long as the door lock closes again before the
count reaches 80 the rope brake will not be deployed.
Test 1 – Slow speed creep away from the landing entrance.
1. Check local operating conditions and guard the lift entrance in accordance
with local requirements.
2. The lift should be parked at a landing floor with both the landing and car
doors open.
3. Ensure the UMD-SRB01 control box is monitoring the lift doors (LED flashing).
4. Fix the hand winding wheel to the machine and slowly hand wind the lift
until the rope brake is triggered and the drop jaw has engaged the ropes.
5. Measure the height between the car floor and the landing floor. This should
be 78mm +/- 50mm.
Test 2 – Sudden loss of traction.
1. Check local operating conditions and guard the lift entrance in accordance
with local requirements.
2. The lift should be parked at a landing floor with both the landing and car
doors open.
3. Ensure the UMD-SRB01 control box is monitoring the lift doors (LED flashing).
4. Lift the machine parking brake and allow the lift to run away uncontrolled
until the rope brake is triggered and the drop jaw has engaged the ropes.
5. Measure the height between the car floor and the landing floor. This
should be 250mm (+/- 50mm) + the slide distance (check the specific lift
calculations). This combined total should be no more than 900mm as stated
in EN81-80:2003 Section 5.9.4 Note 2.
Uncontrolled Movement
Settings
Site Testing of Uncontrolled
Movement
