EUCHNER CES-AZ-UES-xxx (Multicode) - Manual (Page 11)

Operating Instructions Safety System CES-AZ-UES-...
11
Electrical Connection
Warning!
In case of an error, loss of the safety function through incorrect connection.
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The monitoring output OUT must not be used as a safety output.
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Lay the connection cables with protection to prevent the risk of short cir-
cuits.
Caution!
Risk of damage to equipment or malfunctions as a result of incorrect connection.
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All the electrical connections must either be isolated from the mains supply
by a safety transformer according IEC 61558-2-6 with limited output voltage
in the event of a fault, or by other equivalent isolation measures.
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For use and operation as per the requirements, a power supply with the
feature "for use in class 2 circuits" must be used. The same requirement ap-
plies to the safety outputs.
Alternative solutions must comply with the following requirements:
a) Electrically isolated power supply unit with a max. open-circuit voltage of 30
V/DC and a limited current of max. 8 A.
b) Electrically isolated power supply unit in combination with fuse as per UL248.
This fuse should be designed for max. 3.3 A and should be integrated into
the 30 V/DC voltage section.
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All electrical outputs must have an adequate protective circuit for inductive
loads. The outputs must be protected with a free-wheeling diode for this pur-
pose.
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Use cable material made of copper with a temperature resistance of at least
75 °C.
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The tightening torque for the screws on the connection terminals must be
0.6 ... 0.8 Nm.
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The connection cable for the read heads must only be extended using EUCHNER
plug connectors and adequate consideration must be given to EMC. Intermedi-
ate terminals must not be used.
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The screen on the connection cable for the read head must be connected
to the appropriate terminal SH1 ... 4 on the evaluation unit. The portion of
cable from which insulation is stripped should be kept as short as possible
(max. 3 cm).
Safety in case of faults
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The operating voltage U
B
is reverse polarity protected.
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The connections for the read heads are not short circuit-proof.
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A short circuit between 13/14 and 23/24 can be detected only by means of
external pulsing.
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A short circuit in the cable can be excluded by laying the cable with protection.