Chapter
4
Operating Instructions
UE 440/470
38
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
8 010 432/P097/14-03-05
Configurable functions
4.3.5
Releasing the PSDI control
You can release the PSDI control in two different ways:
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Limited:
The UE 470 only evaluates interruptions within the stopping phase as a PSDI,
i.e. if the machine cycle contact was made for the top dead centre (TDC) and has also
fallen away again.
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Not limited:
The UE 470 also evaluates interruptions within the upward and stopping
phases as PSDI if the machine cycle contact is made for the top dead centre (TDC) and
has not yet fallen away again. This configuration makes higher PSDI speeds possible.
Limit the release of the PSDI control if the machine does not automatically stop at the
top dead centre!
If you wish to set the release of the PSDI control to "Not limited", then you must make
sure at the machine side that the machine stops automatically at the top dead centre.
For this you must always observe the standards that apply for your specific
application/machine situation.
4.3.6
Overrun monitoring
The purpose of overrun monitoring is to detect any failure of the machine brake at the top
dead centre. If you activate overrun monitoring, the UE 470 monitors whether the SCC is
still closed before the stroke release, i.e. whether the machine has actually stopped at the
top dead centre.
If the press exceeds the SCC before the operator has interrupted once or twice depending
on the PSDI mode, the UE 470 switches to the operating mode Lock-out (see Page 80).
The SCC contact must be connected for overrun monitoring.
4.3.7
Deactivation of the restart interlock during upward movement
If the upward movement of a press can be classified as not dangerous, reset interlock
during this cycle phase is not necessary. In this case, you can deactivate the restart
interlock during the upward movement.
If the machine cycle contacts are connected correctly, the UE 470 identifies when the
press is in upward movement (see Section 4.3.3 "Significance of the machine cycle
contacts for PSDI mode operation" on Page 35).
The press then stops for intrusion of a protective field during the upward movement, but
starts up automatically again once the protective field is unoccupied.
Prevent it from being possible for people to stand behind the protective field!
The safety application must be configured
with reset interlock
during upward movement if
the protective field can be exited toward the hazardous area! Check whether exiting of the
protective field via the hazardous area can be prevented via corresponding measures, if
necessary.
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Note
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