Back-Up Battery - Helios ICT Platinum Series Instruction Manual

2.2. Back-up Battery

An external lead-acid battery with the same nominal voltage as the
power supply may be connected directly in parallel with the output
terminals, or to the +BAT terminal (on units with the LVD option "B")
to provide a DC backup capability. Use appropriate wire, over
current protection and disconnect device as outlined in the
Installation section. Your load will then be instantly powered from
the external battery if the AC input power should fail, and the battery
will recharge from the supply output when the AC power returns.
Choose your battery size (Ahr capacity) so that it can provide power
to the connected loads for the duration of a typical loss of AC power.
For both battery configurations the external battery will be charged
with a constant current (may be up to the supply output current
setting) until the float voltage (supply output voltage setting) is
reached, and then will be held at a constant float voltage as long as
the Platinum Series power supply is powered on. The maximum
battery charge current from the optional BAT port can be set
independently from the main output current limit.
WARNING!
Potential for personal injury, or damage to property and
equipment due to overcharging of the external battery!
The supply output voltage must be set to a voltage level suitable
for the external battery used. Check the float voltage rating of
your battery and set the supply output voltage accordingly
before connecting the battery to the system.
The battery may be charged at a rate up to the maximum output
current rating of the power supply. Ensure the battery used is
capable of being charged at this rate.
Do not connect any battery when more than one Platinum Series
Power supply is connected in parallel
If the AC power fails during normal operation the battery will remain
directly connected to the output through the LVD contactor and will
power the load with no delay or transition time. As battery voltage
falls to the LVD disconnect level (user adjustable) the LVD contactor
will open to help protect the battery from excessive discharge. The
contactor will re-close once the battery voltage rises again to the LVD
Reconnect threshold (user adjustable) due to charging from either an
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