MP Filtri ICM, User Manual

Page: 45 / 82

Electrical Interface 45
Item Minimum Maximum
Voltage 9V DC 36V DC
Impedance 10k Ohms
Other ways to start a test are:
•
From the ICM front panel
START
button, if fitted (K Keyboard option).
•
Via LPA-View or PLC Modbus command.
•
Periodic automatic testing according to a programmed test mode.
14.6 Alarm Outputs
These are opto-isolated switches that can be used to signal external indicators, PLC
inputs or other equipment (e.g. pump on/off control).
The exact function of these outputs is determined by the Alarm Mode setting (see
12.8.3).
The outputs are "voltage free’’ contacts that can switch AC or DC signals up to
36V nominal (60V absolute maximum peak voltage).
Item Minimum Maximum
Voltage 36V DC
Current 0.5A
14.7 4-20mA Connection
See Figure 14.6 for a schematic.
The two 4-20mA outputs are sourced from the main supply voltage DC+. These
may be connected to the 4-20mA inputs of a process indicator or a PLC. The 0V
connection is then also normally connected to the PLC 0V.
The 4-20mA outputs can be converted to 0-5V outputs by connecting a 250 ohm
resistor between each output and 0V. Similarly they can be converted to 0-10V
outputs by connecting 500 ohm resistors.