PD8-6060 Explosion-Proof Dual Analog Input Process Meter
Instruction Manual
44
Low Alarm Operation (Set < Reset)
For Manual reset mode, ACK can be pressed anytime to turn "off" relay. For
relay to turn back “on”, signal must go above set point and then go below it.
High Alarm with Fail-Safe
Operation (Set > Reset)
Note:
Relay coil is energized in non-alarm condition. In case
of power failure, relay will go to alarm state.
Low Alarm with Fail-Safe
Operation (Set < Reset)
Note:
Relay coil is energized in non-alarm condition. In case
of power failure, relay will go to alarm state.
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.
