PNOZ X2.8P
Operating Manual PNOZ X2.8P
1004082-EN-20
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Function Description
The safety relay PPNOZ X2.8P provides a safety-oriented interruption of a safety circuit.
When supply voltage is supplied the "POWER" LED is lit. The unit is ready for operation
when the start circuit S12-S34 is closed.
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Input circuit is closed (e.g. E-STOP pushbutton not operated):
– LEDs "CH1" and "CH2" will light.
– Safety contacts 13-14, 23-24 and 33-34 are closed, auxiliary contact 41-42 is open.
The unit is active.
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Input circuit is opened (e.g. E-STOP pushbutton operated):
– The LEDs "CH1" and "CH2" go out.
– Safety contacts 13-14, 23-24 and 33-34 are opened redundantly, auxiliary contact
41-42 is closed.
Operating modes
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Single-channel operation: No redundancy in the input circuit, earth faults in the start and
input circuit are detected.
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Dual-channel operation without detection of shorts across contacts: Redundant input cir-
cuit, detects PNOZ X2.8P
– earth faults in the start and input circuit,
– short circuits in the input circuit.
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Dual-channel operation with detection of shorts across contacts: Redundant input circuit,
PNOZ X2.8P detects
– earth faults in the start and input circuit,
– short circuits in the input circuit,
– shorts across contacts in the input circuit.
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Automatic start: Unit is active once the input circuit has been closed.
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Manual start: Unit is active once the input circuit and the start circuit are closed.
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Increase in the number of available contacts by connecting contact expandsion modules
or external contactors/relays.
Timing diagram
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