ProtEX PD8-6080/PD8-6081 Explosion-Proof Modbus
®
Scanner Instruction Manual
47
Setting the Relay Action (
act 1
)
Operation of the relays is
programmed in the
Action
menu.
The relays may be set up for any of
the following modes of operation:
1.
Auto
Automatic reset (non-latching)
2.
A-nman
Aut manual reset at any time (non-latching)
3.
latcH
Latching (manual reset only, at any time)
4.
lt-CLr
Latching with Clear (manual reset only after alarm
condition has cleared)
5.
Altern
Pump alternation control (automatic reset only)
6.
Sanmpl
Sampling (the relay is activated for a user-specified
time)
7.
oFF
Off (relay state controlled by Interlock feature)
The following graphic shows relay 1 action setup; relay 2-4 are set up in a
similar fashion.
Programming Set (
set
) & Reset (
rst
) Points
High alarm indication: program set point above reset point.
Low alarm indication: program set point below reset point.
The deadband is defined as the difference between set and reset points. Minimum deadband is one display
count. If the set and reset points are programmed with the same value, the relay will reset one count below
the set point.
Note: Changes are not saved until the reset point has been accepted.
Setting Fail-Safe Operation (
failsf
)
In fail-safe mode of operation, the relay coil is energized when the process variable is within safe limits and
the relay coil is de-energized when the alarm condition exists. The fail-safe operation is set independently
for each relay. Select
on
to enable or select
off
to disable fail-safe operation.
Programming Time Delay (
delay
)
The
On
and
Off
time delays may be programmed for each relay between 0 and 999.9 seconds. The relays
will transfer only after the condition has been maintained for the corresponding time delay.
The
On
time delay is associated with the set point.
The
Off
time delay is associated with the reset point.
Use Up Arrow
to scroll through
the menu
choices below.
r e l a y 1
r e l a y
r e l a y 1
r e l a y
