Manual for MVK-MPNIO Modules
V 1.9 9
2. Configuration
2.1 Power Supply
B
us modules require a direct-voltage power supply of typically 24 VDC (SELV/PELV) which
must comply with the regulations of conventional industrial power-utility companies.
In order to optimize interference immunity, we advise you to power sensors,
bus, and actuators from different sources. Modules art. no. Artikelnummern
55264, 55256, 55257, 55268, 55269, 55528, 55529 and 55339 require separate
supply due to the internal separation of circuits. The power supply should be
primary switched-mode or regulated power supplies.
T
he output of the power supply units depends on the number of connected electrical consumers
and their output.
In any case, it must be ensured that the system voltage does not drop below
18 V DC viewed from the system power supplies and measured at the remot-
est slave. System response becomes unspecific if sensor and bus power
supply drop below 18 V DC.
Primary switched-mode power supply units normally permit an increase in
output voltage to the amount of the rated voltage in order to compensate for
any power losses.
Modu
les with digital inputs support the direct connection of commercially available sensors. A
separate power supply may be necessary for the sensors if the total power required is high due
to the number of slaves or a high power draw of the sensors.
Recommended power supply units
P
rimary switched-mode power supply units from Murrelektronik are specially designed to power
automation systems.
For this reason, we recommend them to power our modules.
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