Chapter 5 Communication Interface
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Battery/ Battery Pack Connection Warnings:
1. Only use the same type of batteries from the same supplier. Never use old, new and dif-
ferent Ah batteries at the same time.
2. The number of batteries must meet UPS requirements.
3. Do not connect the batteries in reverse.
4. Use the voltage meter to measure whether the total voltage, after battery pack connection,
is around 12.5Vdc × the total number of batteries.
NOTE:
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Turn off the UPS and cut off the AC source before performing battery/ battery pack
replacement.
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A battery can present a risk of electric shock and high short-circuit current.
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Servicing of batteries and battery packs must be performed or supervised by quali ed
service personnel knowledgeable in batteries, battery packs and the required precau-
tions. Keep unauthorized personnel away from batteries and battery packs.
Parallel Connector
This is for UPS parallel communication. Only two UPS units with the same capacity, voltage and frequen-
cy can be coupled via the provided parallel cable to run in parallel mode. The total load will be shared
equally by the two units.
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If one of the two parallel units fails:
1. If the total load is less than a single UPS capacity, the inverter of the failing UPS will shut
down to let the load be supplied by the other unit.
2. If the total load exceeds a single UPS capacity, the inverter of the failing UPS will shut-
down and the other unit will overload. At that time, the two units will simultaneously trans-
fer into bypass mode.
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In parallel mode, the two UPS units can share the battery pack to decrease the cost, but the
start-up of UPS via battery can’t be performed in this mode.
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In parallel mode, the UPS can be repaired without power supply interruption by using a manu-
al bypass box (optional).
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Please see below
Figure 5-f & 5-g
for parallel UPS.
