Helios Large Display Analog Input Batch Controller Instruction Manual
PD2-6210
42
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. 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
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
Relay Sampling Operation
When the signal crosses the set point, the relay trips and the sample time starts. After the sample time
has elapsed, the relay resets. The cycle repeats every time the set point is crossed, going up for high
alarms and going down for low alarms.
The sample time can be programmed between 0.1 and 5999.9 seconds.
Reset
Set
Input
Relay
LED
energized
de-energized
on
off
Automatic (non-latching)
Reset
Set
Input
Relay
LED
Automatic (non-latching)
de-energized
energized
on
off
Set
Reset
Relay
LED
Input
Sample
Time
Sample
Time
Sample
Time
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