PZW
Operating Manual PZW
19157-EN-07
9
Function description
The unit is ready for operation when the feedback loop Y1-Y2 is closed.
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Input circuit closed (supply voltage is present)
"POWER" LED is illuminated. The safety contact 17-18 will be closed immediately and
the auxiliary contacts 25-26, 35-36 will open, time sequence starts. The "OUT" LED is
lit. The safety contact 17-18 is opened redundantly and the auxiliary contacts 25-26,
35-36 will close once the set pulse time has elapsed. The "OUT" LED is goes out.
The input circuit must be closed for at least as long as the set delay time t
v
(pulse time).
When the input or feedback loop is interrupted prematurely, the time sequence is cancelled.
The safety contact 17-18 will open and the auxiliary contacts 25-26, 35-36 will close. The
LEDs "POWER" and "OUT" go out.
The delay time t
v
(pulse time) can be set in 12 stages.
[1]
[2]
[3]
[4]
Legend
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Input: Input circuit
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Feedback: Feedback loop
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Output safe: Safety contact
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Output aux: Auxiliary contacts
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t
v
: Delay time (pulse time)
[1]: Normal operating cycle
[2]: Fault: Input circuit opened too early
[3]: Fault: Feedback loop closed too late within t
v
[4]: Fault: Feedback loop closed too late after t
v
elapsed
NOTICE
At the latest the safety contacts open after the set delay time + 50 ms +
15% of the set value, even in the case of a component failure.
