PZW
Operating Manual PZW
19157-EN-07
10
Installation
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The unit should be installed in a control cabinet with a protection type of at least IP54.
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Use the notch on the rear of the unit to attach it to a DIN rail (35 mm).
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When installed vertically: Secure the unit by using a fixing element (e.g. retaining
bracket or end angle).
Wiring
Please note:
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Information given in the "Technical details" must be followed.
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The output 17-18 is a safety contact, outputs 25-26, 35-36 are auxiliary contacts (e.g.
for display).
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Do
not
use auxiliary contacts 25-26, 35-36 for safety circuits!
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To prevent contact welding, a fuse should be connected before the output contacts (see
Technical details).
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Do not connect undesignated terminals.
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Calculation of the max. cable length 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
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Use copper wire that can withstand 60/75 °C.
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Sufficient fuse protection must be provided on all output contacts with capacitive and in-
ductive loads.
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Do not switch low currents using contacts that have been used previously with high cur-
rents.
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Ensure the wiring and EMC requirements of EN 60204-1 are met.
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On 24 VDC devices:
The power supply must comply with the regulations for extra low voltages with protect-
ive electrical separation (SELV, PELV) in accordance with VDE 0100, Part 410.
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In devices for 24 V DC shorts between the input circuit and feedback loop or earth
faults in the feedback loop can damage the unit. We recommend the use of a short cir-
cuit-proof supply voltage with current limitation.
