Hardened Ethernet Switch
Alarms for Power Failure
Step 1: There are two pins on the terminal block are used for power failure
detection. It provides the normally closed output when the power
source is active. Use this as a dry contact application to send a
signal for power failure detection.
Power Input Assignment
Power3 12VDC
DC
Jack
＋
12-48VDC
Power2
－
Power Ground
＋
12-48VDC
Power1
－
Power Ground
Earth Ground
Terminal Block
Relay Alarm Assignment
FAULT
*Relay warning signal disable for following:
•
The relay contact closes if Power1 and
Power2 are both failed but Power3 on.
•
The relay contact closes if Power3 is failed
but Power1 and Power2 are both on.
Special note:
The relay output is normal open position when there is no power to the
switch. Please do not connect any power source to this terminal to
prevent the shortage to your power supply.
16
