EUCHNER CETx-AR-xxx-CH-xxx (Multicode) - Manual (Page 18)

Operating Instructions Safety Switch CET.-AR-...-CH-...
18
Caution!
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 pur-
pose. RC interference suppression units must not be used.
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.
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.
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.
Safety in case of faults
Ì The operating voltage U
B
and the solenoid voltage UCM are reverse polarity
protected.
Ì The contacts IA/IB and OA/OB are short-circuit-proof
Ì A short circuit between OA and OB is detected by the switch.
Ì A short circuit in the cable can be excluded by laying the cable with protection.
Fuse protection for power supply
The power supply must be provided with fuse protection depending on the number
of switches and current required for the outputs. The following rules apply:
Max. current consumption of an individual switch I
max
I
max
= I
UB
+ I
OUT
+ I
OA+OB
(+ I
OUT D
*)
I
UB
= Switch operating current (80 mA)
I
OUT
= Load current of monitoring outputs (max. 50 mA per monitoring output)
I
OA+OB
= Load current of safety outputs OA + OB (2 x max. 200 mA)
* only for version with door monitoring output
Max. current consumption of a switch chain Σ I
max
Σ I
max
= I
OA+OB
+ n x (I
UB
+ I
OUT
(+ I
OUT D
*))
n = Number of connected switches
* only for version with door monitoring output