ProtEX-MAX PD8-7000 Explosion-Proof Temperature Meter Instruction Manual
34
Signal Loss or Input Break Relay Operation
The following graph shows the input break relay operation for a high alarm relay.
When the meter detects a break in the input, the relay will go to one of the following selected actions:
1. Turn
On
(Go to alarm condition)
2. Turn
Off
(Go to non-alarm condition)
3. Ignore (Processed as an upscale condition)
Time Delay Operation
The following graphs show the operation of the time delay function.
When the signal crosses the set point, the
On
time delay timer starts and the relay trips when the time
delay has elapsed. If the signal drops below the set point (high alarm) before the time delay has elapsed,
the
On
time delay timer resets and the relay does not change state. The same principle applies to the
Off
time delay.
Note: If
“
Automatic or Manual (
A-nmAn
)
”
reset mode is selected, the LED follows the reset point and not
the relay state when the
relay is acknowledged.
Relay
LED
Input
Input Break = Ignore
de-energized
energized
off
on
Relay
LED
Input Break = Off
Relay
LED
Input Break = On
Set
Reset
INPUT
BREAK
INPUT
BREAK
