PD2-6400
Helios High Voltage & Current Meter
www.predig.com
8
4-20 mA Analog Output
The isolated analog output can be configured to represent
the process variable (PV), maximum (peak) value, minimum
(valley) value, the value for any of the eight relay set
points, or Modbus input. While the output is nominally
4-20 mA, the signal will accurately accommodate under- and
over-ranges from 1 to 23 mA.
The 4-20 mA output can be reversed scaled such that 4 mA
represents the high value and 20 mA represents the low value.
For instance, a 4-20 mA output signal could be generated as
the meter went from 100.0 to 0.0.
For applications where the input was linearized by the Helios,
the 4-20 mA output will represent that linearized value.
Connections
The Helios can provide 40 mA at 24 VDC to power the
4-20 mA output signal or an external power supply can be
used:
The internal 24 VDC power supply powering the analog output
may be used to power other devices, if the analog output is
not used. The I+ terminal is the +24 V and the R terminal is
the return.
4-20 mA Output Powered by PD2-6400
4-20 mA Output Powered by External Power Supply
4-20 mA OUTPUT & RELAYS
The 4-20 mA output can either be programmed using the front
panel push buttons or free MeterView Pro software.
The meter can be set up for reverse scaling as shown below:
the output will be 4.00 mA when the display reads 150.0 and
the output will be 20.00 mA when the display reads 0.
Front Panel Push Button Programming
The 4-20 mA analog output can be scaled to provide a 4-20
mA signal for any display range selected. No equipment is
needed to scale the analog output; simply program the display
values to the corresponding mA output signal. The Analog
Output menu is used to program the 4-20 mA output based
on display values.
Aout
setup
dis 1
Aout
0
0000.0
d i s 1
dis 2
Aout
150.0
d i s 2
Out 1
Aout
0
4.000
O u t 1
Out 2
Aout
2
0.000
O u t 2
0
0
MeterView Pro Software Programming
When a meter is programmed as shown below, the output will
be 4.00 mA when the display reads 0 and the output will be
20.00 mA when the display reads 150.0.
Source:
Source for generating the
4-20 mA output (e.g. Amps)
Overrange:
Analog output value
with display in overrange condition
Underrange:
Analog output
value with display in underrange
condition
Break:
Analog output value when
current input break is detected
Max:
Maximum analog output
value allowed regardless of input
Min:
Minimum analog output value
allowed regardless of input
12-35 VDC
Power
Supply
+
4-20 mA
Input Meter
-
+
R
I-
I+
1
3
2
RELAY1
3
2
1
24 V
-
4-20 mA Input
Remote Display,
Chart Recorder, Etc.
-
+
R
I-
I+
MA OUT
1
3
2
RELAY1
3
2
1
24 V
MA OUT
12-35 VDC
Power
Supply
+
4-20 mA
Input Meter
-
+
R
I-
I+
1
3
2
RELAY1
3
2
1
24 V
-
4-20 mA Input
Remote Display,
Chart Recorder, Etc.
-
+
R
I-
I+
MA OUT
1
3
2
RELAY1
3
2
1
24 V
MA OUT
