EUCHNER CES-AR-AES-12 - Manual (Page 7)

Operating Instructions AR Evaluation Unit CES-AR-AES-12
7
Electrical connection
Warning!
In case of an error, loss of the safety function through incorrect connection.
Ì Monitoring outputs must not be used as safety outputs.
Ì 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.
Ì All the electrical connections must either be isolated from the mains supply
by a safety transformer according to IEC 61558-2-6 with limited output volt-
age in the event of a fault, or by other equivalent isolation measures (PELV).
Ì 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.
Ì All electrical outputs and safety contacts must have an adequate protective
circuit for inductive loads. The outputs must be protected with a free-wheel-
ing diode for this purpose.
Ì The tightening torque for the screws on the connection terminals must be
0.6 ... 0.8 Nm.
Ì In order to avoid EMC interference, the physical environmental and operating
conditions at the installation site of the device must comply with the require-
ments according to the standard EN 60204-1:2006, section 4.4.2 (EMC).
Ì Please pay attention to any interference fields in case of devices such as
frequency converters or induction heating systems. Observe the EMC in-
structions in the manuals from the respective manufacturer.
Safety in case of faults
Ì The operating voltage U
B
is reverse polarity protected.
Ì The connections UB AR and 0V AR for the read heads are not short circuit-
proof.
Ì A short circuit between safety contacts can only be detected by external puls-
ing.
Ì A short circuit in the cable can be excluded by laying the cable with protection.