Precision Digital PD865 - Manual (Page 42)

PD865 Snooper Modbus Serial Input Meter Instruction Manual
42
Relay and Alarm Operation
The following graphs illustrate the operation of the relays, status LEDs,
and Acknowledge (ACK) button.
High Alarm Operation (Set > Reset)
Relay
LED
Input
de-energized
energized
off
on
Relay
LED
Automatic or Manual (non-latching)
ACK
pressed
Relay
LED
Manual (latching)
ACK
pressed
Relay
LED
Manual only after passing below Reset (latching)
ACK
pressed
Set
Reset
Automatic (non-latching)
In Manual mode, ACK can be pressed anytime to turn the relay "off".
For the relay to turn back "on", the signal must go below the set point,
and then go above it.