7-32
Connections and Interfaces
IndraControl L40
DOK-CONTRL-IC*L40*****-PR03-EN-P
Connection of inductive load
A line break, the unplugging of a connector for inductive load, e. g.
magnetic valves, contactors etc. or the volitional interrupting by a
mechanical contact causes very high interference levels. These levels
can be spread by galvanic, inductive or capacitive coupling in the system
and potentially lead to malfunctions of the installation or other
installations. To damp this interference level, a corresponding suppressor
element (free-wheeling diodes, varistors, RC elements) are provided
directly at the inductive load. Particularly then, if a switch is provided in
series to the inductive load, e. g. for safety interlocks, you must not
abandon a suppressor circuit.
All standard suppressor elements can be used.
GND breakage
If the GND line to the function module breaks, a leakage current of up to
25 mA per output might flow. In the case of parallel connected outputs the
current multiplies accordingly.
Thus, there will be no reliable protection from GND breakage.
The following values of the peripheral voltage comply with
DIN EN 61131-2:
Nominal value
24 VDC
Tolerances
-15 % / +20 % (without residual ripple)
Residual ripple
+ / - 5 %
Umax
30 V
Umin
19.2 V
Current consumption
Max. 4 A
Fig. 7-47:
Peripheral voltage according to DIN EN 61131-2
External power supply unit
The power supply unit must be safety-separated in accordance with
DIN EN 50 178, section 5.2.18.1. Transformers must be designed with
safety separation in accordance with DIN EN 60 742.
If these requirements are complied with, the 24 V supply voltage is rated
as safety-separated extra-low voltage in accordance with DIN EN 50 178,
section 5.2.8.1. This voltage is designed either as safety extra-low voltage
(SELV) without ground connection of the reference conductor or as
protective extra-low voltage (PELV) with ground connection of the
reference conductor.
A three-phase power supply unit with easy full-bridge rectification is
appropriate. The ripple voltage content must not exceed 5 %.
All 24 V voltage supply lines have to
•
be laid such that they are isolated from lines carrying higher voltages,
or
•
be insulated to a particularly high degree, with the insulation having to
be designed for the highest voltage present (see EN 60 204-1: 1997,
section 14.1.3).
Any peripherals, such as digital sensors/actuators, which are connected
to the interfaces of the function module, have to comply also with the
criteria of safety-separated circuits.
Peripheral Voltage X1S
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