Det-Tronics R8471J Single Channel Gas Controller, OPECL User Manual
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normally open/closed relays
The four relays are individually programmed for either
normally open or normally closed contacts. This
is accomplished by placing a jumper plug on the
appropriate pair of pins. Each relay has a set of three
pins. For normally open operation, place the plug on
the NO and center pins. For normally closed operation,
place it on the NC and center pins. The pin groups are
identified as follows:
J2 – High Alarm
J3 – Auxiliary Alarm
J4 – Low Alarm
J5 – Fault
The controller is programmed at the factory for normally
open relay contacts.
latching/non-latching relays
The Low and Auxiliary alarm relays are programmable
as a group for latching or non-latching operation. The
High alarm relay is always latching. Latching relay
operation is programmed using rocker switch 1 at SW1
(SW1-1). For latching operation, place the switch in the
closed position. For non-latching operation, place it in
the open position. This switch is set at the factory for
non-latching relay operation.
normally energized/De-energized relays
The three alarm relays are programmable as a group for
normally energized (fail-safe) or normally de-energized
operation. This is accomplished by setting rocker
switch 2 at SW1 (SW1-2). For normally energized alarm
relays, place the switch in the closed position. For
normally de-energized operation, place it in the open
position. This switch is set at the factory for normally
de-energized operation.
The Fault relay is always normally energized, regardless
of the setting of SW1-2.
4 to 20 ma output
Isolated or non-isolated operation of the 4 to 20 mA
output is selected using a jumper plug at J1. For
non-isolated operation, as illustrated in Figure 4, place
the jumper plug in the INT (internal power source)
position. Place the plug in the EXT position for an
isolated circuit, as illustrated in Figure 5. The jumper is
set at the factory for non-isolated operation.
relay
Selectable
Selectable
*
Selectable
*
normally
normally
latch/
open/closed
energized/
non-latch
De-energized
Low
Y
Y
Y
High
Y
Y
N
1
Auxiliary
Y
Y
Y
Fault
Y
N
2
N
Y = Yes
N = No
1
Latching only
2
Normally Energized
No latching option
*
Relays selectable as a group.
Table 1—Selectable Relay Options