Precision Digital PD865 - Manual (Page 46)

PD865 Snooper Modbus Serial Input Meter Instruction Manual
46
Low Alarm with Fail-Safe Operation (Set < Reset)
Reset
Set
Input
Relay
LED
Automatic (non-latching)
de-energized
energized
on
off
Relay
LED
Automatic or Manual (non-latching)
ACK
pressed
Relay
LED
Manual (latching)
ACK
pressed
Relay
LED
Manual only after passing above Reset (latching)
ACK
pressed
Fail-safe operation: relay coil is energized in non-alarm condition. In case of
power failure, relay will go to alarm state.