PSEN cs4.2a
Operating Manual PSEN cs4.2a
1003575-EN-08
| 14
Wiring
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Information given in the
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Switch off the supply voltage before disconnecting the safety switch from the supply
voltage.
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Make sure that when connecting or separating the connector the pollution degree 1 or 2
is maintained.
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The max. cable length l
max
in the input circuit is calculated from
– the max. cable capacitance at the safety outputs (see
– the minimum permitted supply voltage at the safety switch (19.2 V).
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The power supply must meet the regulations for extra low voltages with protective elec-
trical separation (SELV, PELV).
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The inputs and outputs of the safety switch must have a protective separation to voltages
over 60 VDC.
INFORMATION
Only use safety relays with a 24 VDC supply voltage. Safety relays with a
wide-range power supply or in AC device versions have internal potential
isolation and are not suitable as evaluation devices.
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The supply voltage to the safety switch must be protected with a 2 A to 4 A quick-acting
fuse.
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Ensure the wiring and EMC requirements of EN 60204-1 are met.
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When connecting in series, consider the requirements of manipulation protection and the
protection against bypassing or from overriding the safety switch (EN ISO 14119).
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When the safety inputs of the safety switch are controlled by an upstream device, and
they are not wired with 24 V,
– They must be monitored for shorts across contacts (e.g. by PSEN cs, PSEN ml,
PSEN sg or PSEN sl)
or
– The faults at the safety inputs that can occur by shorts across contact will have to be
excluded by suitable measures (e.g. wiring in accordance with EN 602041).
