ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller
Instruction Manual
47
Relay and Alarm Operation
Diagrams
The following graphs illustrate the operation of the
relays, status LEDs, and ACK button.
High Alarm Operation (Set > Reset)
For Manual reset mode, ACK can be pressed anytime
to turn "off" relay. To detect a new alarm condition, the
signal must go below the set point, and then go above
it.
Low Alarm Operation (Set < Reset)
For Manual reset mode, ACK can be pressed anytime to turn
"off" relay. To detect a new alarm condition, the signal must
go below the set point, and then go above 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.