EUCHNER CES-A-ABA-01 - Electrical connection; Notes about UL; Safety in case of faults; Fusing of the power supply and the safety contacts

11
071873-15-07/15 (translation of the original operating instructions)
Operating Instructions
Non-Contact Safety System CES-A-ABA-01/CES-A-ABA-01B
EN
8. 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 circuits.
NOTICE
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 transform-
er according to IEC 61558-2-6 with limited output voltage in the event of a fault, or by other equiv-
alent isolation measures.
Ì All electrical outputs must have an adequate protective circuit for inductive loads. The outputs
must be protected with a free-wheeling diode for this purpose. The switch-on current may have to
be limited for capacitive loads.
Ì The tightening torque for the screws on the connection terminals must be 0.6…0.8Nm.
Ì The connection cable for the read heads must only be extended using EUCHNER plug connectors,
and adequate consideration must be given to EMC. Intermediate terminals must not be used.
Ì The screen on the connection cable for the read head must be connected to the appropriate termi-
nal SH on the evaluation unit. The portion of cable from which insulation is stripped should be kept
as short as possible (max. 3cm).
8.1. Notes about
Important!
Ì For use and operation as per the requirements
1)
, a power supply with the feature “for use in
class 2 circuits” must be used.
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 Use cable material made of copper wire with a temperature resistance of at least 75°C.
1) Note on the scope of the UL approval: The devices are tested according to the requirements of UL508 and CSA/ C22.2 no. 14 (protection against electric shock
and re).
8.2. Safety in case of faults
Ì The operating voltage U
B
is reverse polarity protected.
Ì The connections for the read heads, ERR and OUT are not short circuit-proof.
Ì A short circuit between 13/14 and 23/24 can be detected only by means of external pulsing.
Ì A short circuit in the cable can be excluded by laying the cable with protection.
8.3. Fusing of the power supply and the safety contacts
Ì Provide external contact fuses (6AgG fuse or 6A circuit breaker, characteristic B or C) for relay outputs.
Ì The power supply must be protected with a max. 8A fuse ahead of terminal U
B
.