50
Figure 6: Circuit diagram of relay interface
Description of the PIN assignment:
Pin
No.
Battery mode
2
normally
open
PIN 2 is shorted to PIN 4
(ground) if the mains power
supply fails or is out of
tolerance.
UPS shut-down
in case of
battery
operation
6, 7
If, in the case of battery
operation, a positive signal
level (+5 V to + 12 VDC) is
applied for 500 ms, the UPS
system shuts down.
Battery capacity
low
5
normally
open
PIN 5 is shorted with respect
to PIN 4 if batteries have
become discharged to such
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