LEGRAND Keor T 10KVA, Operating Manual

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8
4.2. Battery Mode
In this operation, energy is drawn from the batteries. The loads are supplied via inverter. Output voltage is
sinusoidal and has a regulated amplitude and frequency.
Battery voltage should be in acceptable limits and the inverter should be enabled for the UPS to operate
in this mode.
UPS operates in Battery Operation in the following cases:
• While UPS is operating in Online Operation; if frequency/waveform/rms value of mains voltage go beyond
the rectifier limits,
• While UPS is operating in Bypass Operation, if frequency/waveform/rms value of mains voltage go beyond
Bypass limits,
• If Inverter enabled: “YES”, Rectifier enabled: “NO” are selected through the front panel (Authorisations
Menu for authorized Service Staff).
Keor T UPS operates with one or several parallel strings of 1 x 34pcs 12VDC battery with common neutral.
You may see the battery string connection as below;
+
-
n x 17 pcs n x 17 pcs
POSITIVE STRING
NEUTRAL
POINT
N
NEGATIVE STRING
Two Serial Strings with Central Point – Neutral Potential –
Battery Management and Battery Back-Up Time
When UPS operates in Online or Bypass Operation; it continuously calculates and displays the remaining
back-up time. However the calculated values will be healthier and accurate a few minutes after the
UPS switches to Battery Operation.
Autonomy time depends on battery type, quantity, capacity, situation and load level. UPS stops supplying
the loads if the battery voltage decreases under a specific value.
Battery life depends on some parameters such as battery type, charge-discharge cycle, and depth
of discharge, ambient temperature, conditions. Please check Technical Specifications for the ideal
environmental conditions for the batteries. Using the batteries outside this temperature range will decrease
battery operation time and battery life.