KROHNE UFM 3030 EEx EN - Manual (Page 11)

UFM 3030 11
1.5 Electrical data
1.5.1 Power
supply unit
The UFC 030…-EEx electronics unit is equipped with a switching-mode power supply, which is
available in two supply voltage ranges, namely:
•
100…240 V AC power supply;
•
24 V AC/DC power supply.
The power supplies are available in the standard as well as the MODIS design. The main difference
between these versions is that the MODIS versions are not provided with the analogue input A1 and
its driver logic. The +33 V output of the secondary winding of the mains transformer that provides
the necessary 24 V for the analogue input driver logic is therefore not available on the MODIS
versions.
The power supply’s mains transformer provides the galvanic separation between the primary circuit
(i.e. mains supply) and the secondary circuits. The secondary windings of the mains transformer
deliver the following output voltages:
•
+/- 33 V to supply 24 V to the driver logic of the analogue input A1. This analogue input is only
available on the standard (non-MODIS) versions.
•
+/- 24 V for the +6 V and -6 V internal supply voltages of the electronic components of the
UFC 030…-EEx electronics unit.
The table below lists the electrical input voltages of the power supply units, at the primary side of
mains transformer.
Mains supply voltage Power supply Nominal voltage Tolerances
Minimum Maximum Limit
24 V AC/DC 24 V AC -10/+15% 21.6 V AC 27.6 V AC 39 Vpeak
24 V DC -25/+33% 18 V DC 32 V DC
100…240 V
AC 100…240 V AC -15/+10% 85 V AC 264 V AC 375 Vpeak
The table below lists the electrical data of the power supply outputs. Note that the MODIS versions
of the 24 V AC/DC and 100…240 V AC power supply units are not equipped with the analogue
input driver. The secondary winding of the mains transformer that supplies the 24 V for the current
output driver is therefore not used. It only has a pull-down resistor of 10 M Ohm towards earth
potential.
Power supply output
Parameter Minimum Nominal Maximum Limit (1)
Voltage +5.4 V +6 V +6.54 V (2) 40 V Electronics pos. supply
Current 225 mA 400 mA 571 mA -
Voltage -5.2 V -6 V -9 V 40 V Electronics neg. supply
Current 20 mA 50 mA 88 mA -
Voltage 21.6 V 24 V 26.4 V 40 V Analogue input driver (3)
Current 1 mA (4) 100 mA -
(1) Due to the explosion safety measures for the MODIS modules.
(2) Depends on the load.
(3) Only for standard (non-MODIS) versions.
(4) Depends on what the user connects to the current output.