Helios PD2-6262 Dual Analog Input Rate/Totalizer
Instruction Manual
22
F4 Digital Input Connections
A digital input, F4, is standard on the meter. This
digital input connected with a normally open closure
across F4 and COM, or with an active low signal
applied to F4. It can be used for remote operation of
front-panel buttons, to acknowledge/reset relays,
reset totals, or to reset max/min values. See
Keys & Digital I/O Available Settings
complete list of capabilities.
Figure 24. F4 Digital Input Connections
4-20 mA Output Connections
Connections for the 4-20 mA transmitter output are
made to the connector terminals labeled MA OUT.
The 4-20 mA output may be powered internally or
from an external power supply.
Figure 25. 4-20 mA Output Connections
Analog Output Transmitter Power
Supply
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.
Figure 26. Analog Output Supply Powering Other
Devices
Remote Operation of Meter
The meter can be operated via the programming
buttons or a PDA2364-MRUE remote control station
using the digital inputs and outputs connections as
illustrated in
Figure 27. Meter to PDA2364-MRUE
Figure 27. Meter to PDA2364-MRUE Control
Station Connection
Interlock Relay Feature
As the name implies, the interlock relay feature
reassigns one, or more, alarm/control relays for use
as interlock relay(s). Interlock contact(s) are wired to
digital input(s) and activate the interlock relay. This
feature is enabled by configuring the relay, and the
corresponding digital input(s), see
Interlock Relay (Force On) Feature
In the example below, an Interlock Contact switch is
connected to a digital input, which will be used to
force on (energize) the Interlock Relay. The Interlock
Relay and the Control Relay are connected in series
with the load.
•
When the Interlock Contact is closed (safe), the
Interlock Relay energizes, allowing power to flow
to the Control Relay; the corresponding front
panel LED is on.
•
When the Interlock Contact is open, the
corresponding front panel LED flashes (locked
out), the Interlock Relay is de-energized,
preventing power from flowing to the Control
Relay and the load.
Figure 28. Interlock Connections
4-20 mA Input
Remote Display, PLC,
Chart Recorder, Etc.
-
+
R
I-
I+
1
3
2
RELAY1
mA OUT
24 V
12-35 VDC
Power
Supply
+
4-20 mA
Input Meter
-
+
R
I-
I+
1
3
2
RELAY1
3
2
1
-
24 V
mA OUT
Internal Power Supply
and Analog Output
3
2
1
Active Output Loop
Passive Output Loop
R
I-
I+
1
3
2
24 VDC
Powered
Device
24 V
+
-
