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Types of cams
Three types of cams are used in the system:
Deceleration cams
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There are two deceleration cams:
Deceleration lower limit (SlowLowerLimit) read by the InputSlowLowerLimit input;
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Deceleration upper limit (SlowUpperLimit) read by the InputSlowUpperLimit input.
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These cams have the following functions:
SlowLowerLimit: if engaged it may cause the lift to slow down when this is travelling towards the
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lowest floor at an incorrect speed.
SlowUpperLimit: if engaged it may cause the lift to slow down when this is travelling towards the
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highest floor at an incorrect speed.
The length of the deceleration cams must be calculated so that the lift car has time to stop from the moment
it engages a cam while travelling at maximum speed before reaching the maximum lift travel limit.
There may be several landing zones in the area covered by the deceleration cams.
In some systems the qualification cams, described below, can be used as deceleration cams. In this case
there must only be one landing zone in the area covered by the deceleration cams.
Qualification cams
There are two qualification cams:
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The LowerLimit cam read by the InputLowerLimit input
The UpperLimit cam read by the InputUpperLimit input
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These cams are used for the following functions:
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Execution of the Zero Cycle, in conjunction with cams A and B.
The Self Study sequence for storing the position of the floors present in the system.
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The qualification cams qualify the end landing zones and thus determine the first and top floors. For this
reason there must only be one landing zone in the area covered by the qualification cam.
Floor counter cams
Each floor in the system is associated with a pair of floor counter cams.
These cams are called CAM A and CAM B and are read by the InputCammaA and InputCammaB inputs.
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The landing zone is the area determined by the logical OR of cam A and cam B.
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There is one pair of cams for each floor in the system.
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These cams are used by the following functions:
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Floor counter.
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Realignment of the lift car at the floor.
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Zero cycle at the lowest floor, in conjunction with theLowerLimit qualification cam.
Zero cycle at the highest floor, in conjunction with the UpperLimit qualification cam.
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The Self Study sequence for storing the position of the floors present in the system.
ADL300-EPCv2- User Guide
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Page 10 of 64
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