CR720S CR721S
7
ATTENTION
Contact corrosion between the mounting screws and the housing
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Damage to the device
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Do not use stainless steel screws or nickel-plated screws.
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Use zinc-plated screws.
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In very corrosive environments such as extremely salty air, use screws with surface
finishing on a zinc/nickel basis with thick-film passivation and sealing.
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Provide all outgoing cables with a strain relief 200 mm behind the cable entry.
6 Electrical connection
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Disconnect the machine from the mains supply before installation; if necessary, also
disconnect any independently supplied input / output load circuits.
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Observe the national and international regulations for the installation of electrical equipment.
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Observe the requirements according to EN 60204.
Accessible surfaces of the device are insulated from the circuits with basic insulation to IEC 61010-1
(secondary circuit with max. 32 V DC, supplied from the mains circuit up to 300 V of overvoltage
category II).
GND of the supply is connected via EMC suppression capacitors on the shield connection (metal
housing) of the device.
The external wiring has to be carried out in a way that ensures the required separation from other
circuits.
6.1 Wiring
The connection terminals may only be supplied with the signals indicated in the technical data /
on the device label and only the approved accessories from ifm may be connected.
Only connect the connector pins as shown in the pin layout. Unspecified connector pins remain
unconnected. The unconnected connector pins need to have sealing of the individual cores.
ATTENTION
Absence of reverse polarity protection
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Reverse polarity protection is only ensured in case of supply via the on-board system
(via a battery), if the polarity of the supply is reversed as a whole (battery connected
incorrectly). The basic principle of the reverse polarity protection is that the upstream
fuses are quickly switched off in case of excessive current. In case of supply via PELV,
reverse polarity protection is not ensured.
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Damage to the device
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Ensure that the ends of the cables are properly connected to the connector before
connecting the latter to the device, also in case of supply via the on-board system.
The device is designed for supply via a mobile on-board system (12/24 V DC nominal voltage) or
protective low voltage PELV according to the technical data and national regulations. The supply
is directly transferred to the connected sensors/actuators without electrical separation.
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Connect all required supply lines, GND connections and the shield connection.
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