OnLine Power Signal Saver IPC - Manual (Page 81)

6002-1842 Rev A ECO# 8881
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2.4.1 Battery Back-up Time Test up Time Test
Purpose: Describes how to measure the back up capacity of batteries.
This test provides a measurement of back-up time during a power outage by actually discharging the batteries. The
back-up time is dependant on load and battery age. More back-up time is available with less load (in Amps or Watts)
and less time with more load.
Tip: We recommend
performing this test every 6 months.
Tip: Make sure the batteries are fully charged before starting the test. The STATUS submenu should show V
(batt) of approximately 55.2 VDC at 25°C (77°F).
DANGER!
If the actual intersection signals are used as the load for this test, and the load is left on the batteries
beyond the low battery alarm (AC line power is not restored), the batteries will continue to discharge
down to the Low Battery Shutdown, at which point power output to the intersection from the UPS is
automatically shut off to avoid damaging the batteries. The intersection will go DARK.