PZA
Operating Manual PZA
18219-EN-07
9
} t
v
: Delay time
[1]: Normal operating cycle
[2]: Fault: Input circuit opened too early
[3]: Fault: Feedback loop closed too late after t
v
elapsed
NOTICE
At the earliest the safety contacts close after the set delay time - 15% of the
set value, even in the case of a component failure.
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 (35 mm).
} When installed vertically: Secure the unit by using a fixing element (e.g. retaining
bracket or end angle).
Wiring
Please note:
} Information given in the "Technical details" must be followed.
} The output 17-18 is a safety contact, outputs 25-26, 35-36 are auxiliary contacts (e.g.
for display).
} Do not use auxiliary contacts 25-26, 35-36 for safety circuits!
} To prevent contact welding, a fuse should be connected before the output contacts (see
Technical details).
} Do not connect undesignated terminals.
} Calculation of the max. cable length l
max
in the input circuit:
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.
} Ensure the wiring and EMC requirements of EN 60204-1 are met.
} 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.
} 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.
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