ProtEX-MAX PD8-7000 Explosion-Proof Temperature Meter Instruction Manual
31
Setting the Relay Action
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. Automatic reset (non-latching)
2. Aut manual reset at any time (non-latching)
3. Latching (manual reset only, at any time)
4. Latching with Clear (manual reset only after alarm condition has cleared)
5. Relay alternation control (automatic reset only)
6. Sampling (the relay is activated for a user-specified time)
7. Off (relay disabled and Interlock feature enabled)
The following graphic shows relay 1 action setup; relay 2-4 are set up in a similar fashion.
Programming Set and Reset Points
High alarm indication: program set point above reset point.
Low alarm indication: program set point below reset point.
The deadband is determined by 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
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
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.
Relay Action for Loss of Input (Input Break)
Each relay may be programmed to go to one of the following conditions when the meter detects the loss
of the input signal:
1. Turn
On
(Go to alarm condition)
2. Turn
Off
(Go to non-alarm condition)
3. Ignore (Processed as an upscale condition)
