Pilz PZE X4VP8 24VDC 4n/o - Manual (Page 6)

PZE X4VP8
Operating Manual PZE X4VP8
1003206­EN­06 6
Safety features
The unit meets the following safety requirements:
} The contact expander module expands an existing circuit. As the output relays are
monitored via the base unit's feedback loop, the safety functions on the existing circuit
are transferred to the contact expander module.
} The safety function remains effective in the case of a component failure.
} Earth fault in the feedback loop:
Detected, depending on the base unit that is used.
} Earth fault in the input circuit:
The output relays de­energise and the safety contacts open.
Block diagram/terminal configuration
8A 6B 7B 5B 8B 5A 6A 7A
Delay
*
*Insulation between the non­marked area and the relay contacts: Basic insulation (over­
voltage category III), Protective separation (overvoltage category II)