Precision Digital Corporation PD6900 Series, Instruction Manual

Page: 25 / 82

PD6928 Ex-Proof & I.S. Loop-Powered Flow Rate/Totalizer Instruction Manual
25
Digital Input Connections
A digital input is standard on the meter. This digital
input is connected with a normally open contact
across DI+ and DI-, or with an active low signal
applied to DI+ and DI-.
Figure 10. Digital Input Connections
4-20 mA Output Connections
Connections for the 4-20 mA transmitter output are
made to the connector terminals labeled 4-20 mA
Output on
Figure 6 , page 23 . The 4-20 mA output
must be powered from an external power supply.
Figure 11. 4-20 mA Output Connections
Solid-State Relay Connections
Relay connections are made to two-terminal
connectors, as shown on
Figure 5 , page 22 . Each
relay’s C terminal is common only to the normally
open (NO) contact of the corresponding relay.
Figure 12. Solid-State Relay Connections
Open Collector Output Connections
Open collector output 1 and 2 connections are made
to terminals labeled OC1 and OC2 on
Figure 4 , page
22. Connect the alarm or pulse input device as shown
below.
Figure 13. Open Collector Output Connections
- +
DI
- +
Device with
4-20 mA
Input
- +
Power
Supply
+ -
C NO
C NO
Load
Load
Power
Relay 1
Relay 2
Power
Supply
- +
- + + -
OC2 OC1
Alarm
Indicator/
Pulse
Counter
+
-
External DC
Relay
5-30 VDC
150 mA MAX