Pilz PZE X4VP8 24VDC 4n/o - Manual (Page 7)

PZE X4VP8
Operating Manual PZE X4VP8
1003206­EN­06 7
Function description
The contact expansion module is an add­on device with selectable delay­on de­energisa­
tion, and it is used to expand a safety circuit. The contact expansion module is driven by a
base unit (e. g. emergency stop relay).
} Functional procedure after closing the safety contacts of the base unit:
– The supply voltage is present at the input (A1) of the contact expansion module.
– Close the safety contacts 17­18, 27­28, 37­38 and 47­48.
– The LEDs "CH. 1" and "CH. 2" are lit.
} Functional procedure after opening the safety contacts of the base unit:
– There is not supply voltage at input (A1) of the contact expansion module.
– Safety contacts 17­18, 27­28, 37­38 and 47­48 open after the delay time.
– The LEDs "CH. 1" and "CH. 2" go out.
Installation
} The unit should be installed in a control cabinet with a protection type of at least IP54.
} Use the notch on the rear of the unit to attach it to a DIN rail.
} Ensure the unit is mounted securely on a vertical DIN rail (35 mm) by using a fixing ele­
ment (e.g. retaining bracket or an end angle).
Wiring
Please note:
} Information given in the " Technical details [ 10] " must be followed.
} Outputs 17­18, 27­28, 37­38 and 47­48 are delay­on de­energisation safety contacts.
} To prevent contact welding, a fuse should be connected before the output contacts (see
Technical details).
} Calculation of the max. cable runs l
max
in the input circuit:
R
lmax
R
l
/ km
I
max
=
R
lmax
= max. overall cable resistance (see Technical details)
R
l
/ km = cable resistance/km
} Use copper wire that can withstand 60/75 °C.
} Sufficient fuse protection must be provided on all output contacts with capacitive and in­
ductive loads.
} Do not switch low currents using contacts that have been used previously with high cur­
rents.