Dräger REGARD 3900 Serie Instrucciones De Uso página 58

Installation & commissioning
The grounding plate is not required for the control unit to meet the EMC
Directive.
5.5 Power supply
The external power supply to the control unit is made via an AC or DC power
source, or both. If both are used, the DC power supply source acts as a supporting
supply. It can be a 24 V DC power supply or a 24 V rechargeable battery. For
specifications and tolerances for the AC and DC power sources, refer to the
technical data.
For applications in accordance with Directive 2014/90/EU, the ferrite (order no.
83 28 267) must be installed on the cable from the power supply according to the
figure.
5.5.1 AC power supply
If the internal 24 V DC power supply unit is not provided by Dräger, it must be
ensured that the requirements of the EMC (electromagnetic compatibility) Directive
and the Low Voltage Directive have been met. The power supply unit must comply
with the following EMC standards - Immunity: EN 61000-6- 2; Emissions:
EN 61000-6-3 or EN 61000-6-4.
If the AC voltage supply comes from an AC power socket, the maximum length of
the cable between the socket and the control unit is 3 m.
For the voltage supply, use a 24 V DC power supply unit as shown in the image
below. The power supply unit should be chosen according to the number of input
channels used.
Dräger recommends the following:
– 4 channels - 2 A energy supply unit.
– 8 channels – 5 A energy supply unit.
– 12 or 16 channels - 10 A energy supply unit.
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REGARD 3900