3.6.1 Location of “Reference end position” - trip dogs when using linear transducers
(Inputs for “Reference pulse inhibit” are not required and remain disconnected).
Range between emergency stop
switches
It-
measuring length
Reference point position
41
Linear transducer
Trip dog switch “Reference end position”
closed
I
open
Switch “Reference end position”
3.62 Location of “Reference end position” and “Reference pulse inhibit” - trip dogs when using
rotary encoders
With installation of rotary encoders, an additional trip dog switch per axis is necessary for reference pulse
suppression.
A rotary encoder produces one reference pulse per revolution, e.g. a spindle pitch of 10 mm will, after 10 ms
of travel, transrnit one reference pulse. The control will evaluate a reference pulse only when the trip dog
“reference end position” is closed and trip dog “reference pulse inhibit” is open. In the example, the trip
dog must be adjusted such, that the switch opens 5 mm before the desired reference pulse and closes
approx. 5 mm after the reference pulse.
Range between emergency stop
switches
A
A A ,A A
1 ;‘ desired reference pulse i
I
open
closed
1 open ]
closed
I I
Possible reference pulses from
rotary encoder
Trip dog switch
“Reference end position”
Switch “Reference end position”
Trip dog switch
“Reference pulse inhibit”
Switch “Reference pulse inhibit”
24
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