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3.3.4
Zero cycle command
The zero cycle command is used to initialise the lift encoder counter and the floor counter. When the
initialisation procedure is complete, if the floor levels are operational, it executes a floor 0 positioning
operation.
The zero cycle is a sequence used to:
Initialise the motor incremental encoder.
•
Initialise the floor counter function performed by the realignment cams.
•
Home Zone
There must only be
one landing zone
cam in this area.
The following conditions are necessary in order for the zero cycle sequence to function correctly:
1. Set the ZeroSpd parameter, which represents the zero search speed, to a suitably low value.
2. In the area delimited by the Lower Limit cam there must only be one floor cam, also called a zero cam.
The zero cam consists of the or of the two floor cams.
3. The zero cycle sequence must never be started when the position of the lift car is lower than the
deceleration cam.
The zero cycle sequence is performed as follows:
1. If the zero cam is not engaged:
•
The lift car starts moving in the negative direction.
The moment the lift car engages the zero cam, the incremental encoder position and floor counter
•
are initialised.
The lift car stops and the system sets ZeroFound = 1 and concludes the zero cycle sequence.
•
2. If the zero cam is engaged:
The lift car starts moving in the positive direction.
•
The movement stops when the lift car releases the zero cam.
•
•
The lift car starts moving in the negative direction.
The moment the lift car engages the zero cam, the incremental encoder position and floor counter
•
are initialised.
The lift car stops, the system sets ZeroFound = 1 and concludes the zero cycle sequence.
•
For a variety of reasons, the zero sequence must be performed at low speed. If the sequence is launched
with the lift car a long way from the zero cam, the cycle could take a very long time to be executed.
ADL300-EPCv2- User Guide
____________________ _
Direction of increase in height of lift.
Zero cam
This cam is the logical OR of cam A
and cam B.
Never start the zero cycle
sequence if the lift car has
exceeded this limit!
.
Page 17 of 64
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