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4 Parallel Mode Start up
Start up procedure
• Ensure that the input and output circuit breakers are set to off position for all the UPS.
• Turn on the input breaker (CBi and CB1) of all the UPS connected ( all the units are now in by-
pass mode)
• Turn on the inverter of the first unit (ID01). The other units will turn off the bypass line.
• When the bypass line of the other UPSs is off, turn on them progressively.
• Turn on all the output breakers connected to the UPSs (CBo and CBoutput)
Redundancy Function Check
If the parallel system is working properly ( N+1 redundancy operation) the N+1 redundancy LED
is on.
• To verify that the redundancy function indicator works properly repeat the start up procedure
turning on only part of the UPS connected in parallel, and apply a load above the values shown
in the below table, the N+1 LED will turn off.
PARALLEL UNITS
2 UNITS
3 UNITS
4 UNITS
• If the redundancy check is positive repeat again the start up procedure turning on all the UPS
connected
The Installation procedure is finished !
CAUTION
If the N+1 led is off the loads exceed the
redundancy level. The load has to be reduced
until the N+1 redundancy LED turn ON.
REDUNDANCY LEVEL ( LOAD %)
50%
66%
75%
Daker DK 4.5-10 kVA
13
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