DDMC Analog Input Process Meter / Controller
Instruction Manual
18
External Relays Connections
The relay expansion module PDA1004-DB is
connected to the meter using a CAT5 cable provided
with each module. The two RJ45 connectors on the
expansion modules are identical and interchangeable;
they are used to connect additional modules to the
system.
•
DO NOT
connect or disconnect the expansion
modules with the power on! More detailed
instructions are provided with each optional
expansion module.
Figure 22. Expansion Module
& DIN Rail Mounting Kit
Figure 23. External Relays Module Connections
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
on page
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 24. Interlock Connections
1
2
RLY5
RLY6
RLY7
RLY8
3
4
5
6
7
8
NO
C
NO
C
NO
C
NO
C
