Pilz PST 4 - Operation

PST 4
Operating Manual PST 4
18436-EN-06
12
Feedback loop
Without feedback loop monitor-
ing
With feedback loop monitoring
Link or contacts from external con-
tactors
Y1
13 (23 ... 63)
14 (24 ... 64)
K3 K4
K3
K4
N
L1
Y2
Start-up testing
Y1
Y2
INFORMATION
The feedback circuit must be closed at least 500 ms before limit switch S1
is operated and may only be opened once limit switch S1 has been oper-
ated.
Legend
} S1/S2: Safety gate switch
} S3: Start button
} : Switch operated
} : Gate open
} : Gate closed
Operation
When the relay outputs are switched on, the mechanical contact on the relay cannot be
tested automatically. Depending on the operational environment, measures to detect the
non-opening of switching elements may be required under some circumstances.
When the product is used in accordance with the European Machinery Directive, a check
must be carried out to ensure that the safety contacts on the relay outputs open correctly.
Open the safety contacts (switch off output) and start the device again, so that the internal
diagnostics can check that the safety contacts open correctly
} for SIL CL 3/PL e at least 1x per month
} for SIL CL 2/PL d at least 1x per year