Datasheet

Relays for functional safety
Safety relays PNOZ X
PNOZ X7P
Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
Telephone: [phone], Telefax: [phone], E-Mail: [e-mail]
2016-09
166
Wiring
Please note:
} Information given in the "Technical details [ 168]" must be followed.
} Calculating the max. cable length I
max
in the input circuit on PNOZ X7P 24 VAC/DC:
R
lmax
R
l
/ km
I
max
=
R
lmax
= max. overall cable resistance (see Technical details [ 168])
R
l
/km = cable resistance/km
} Calculating the max. cable length I
max
in the input circuit on PNOZ X7P AC units:
C
C
C
lmax
= max. overall line capacitance (see Technical details [ 168])
C
l
/km = line capacitance/km
Stub circuit: The max. permitted cable length I
max
depends on the max. overall line ca-
pacitance C
lmax
(see Technical details [ 168]).
Alternative: Loop circuit: Capacitance is negligible; 1 phase: Max. cable length I
max
: 1
km
Stub circuit Loop circuit
Cable length
l
max
PNOZ X7P AC
l
max
PNOZ X7P AC
} The outputs 13-14, 23-24 are safety contacts.
} Do not connect undesignated terminals.
} To prevent contact welding, a fuse should be connected before the output contacts (see
Technical details [ 168]).
} 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.
} On AC units: Connect operational earth terminal to functional earth.
} On 24 VAC/DC units:
The power supply must comply with the regulations for extra low voltages with safe
electrical separation (SELV, PELV) in accordance with VDE 0100, Part 410.
} Ensure the wiring and EMC requirements of IEC 60204-1 are met.