EUCHNER CES-AH-C03-AH-SM (Unicode) - Manual (Page 8)

Operating Instructions Safety Switch CES-AH-C03-AH-SM
8
Electrical connection
General notes
Caution!
Risk of damage to equipment or malfunctions as a result of incorrect connection.
Ì To avoid faults, the cable must be laid with protection.
Ì The power for the operating voltage and for the inputs +LA and +LB must be
provided from a common power supply.
Ì 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.
Ì With inductive loads there can be voltage spikes of up to -50 V lasting sev-
eral milliseconds on switching off the outputs.
Ì To prevent overvoltages on the inputs and outputs for the safety circuits,
inductive loads must be connected with free-wheeling diodes (see Connec-
tion examples page 12.
Ì Power devices which are a powerful source of interference must be installed
in a separate location away from the input and output circuits for signal pro-
cessing. The cable routing for safety circuits should be as far away as pos-
sible from the cables of the power circuits.
Test pulses, pulsing and power control
Important!
Ì In operation the device regularly switches off the safety outputs for approx.
6 ms to check the safe switching function. The loads connected must toler-
ate this behavior.
Ì A load connected is controlled using the safety paths +LA/LA and +LB/LB.
The control voltage can be pulsed for power control.
Ì Do not use a control system with pulsing to test the output cables or switch
off the pulsing function in your control system.
Behavior in case of faults
Attention!
Ì In the event of a fault in the safety switch, the safety circuit is switched off
and the DIA LED illuminates red.
Ì After approx. 5 s. the device performs a re-start.
Important!
If the device does not appear to function when operating voltage is applied (e.g.
green STATE LED does not flash), the safety switch must be returned unopened
to the manufacturer.