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6.1 Introduction
The PARALLEL connection of PYRAMID-PLUS SYSTEMS allow high security by power redundant
operation.
6.2 Parallel Operation Modes
Parallel operation is in 3 modes:
• SYMETRIC PARALLEL operation
• REDUNDANT parallel operation
• HOT STANDBY operation
CAUTION!!! Do not set the operation modes of the parallel connected UPSs to ON-LINE,
otherwise serious damage may occur.
User can select one of the operation modes according to purpose if parallel control board is
installed on UPS.You can select operation mode from SETTINGS MENU, in this chapter you can
find parallel operation mode informations.
6.2.1 Symetric Parallel Mode
On UPS panel, shortly “PARALLEL MODE” word is used. This mode is useful for increasing power
capacity. Mains power is used as the spare energy supply. In case of an Inverter failure in one of
the UPS’s, the static bypass system of all UPS’s go to bypass together. If everything returns to
normal, than the inverters resume the load together. If current sharing is active, current is shared
50%-50% by two UPS’s. During bypass, the UPS’s also share the load.
If this mode is active, on the LCD panel of one UPS, you will see “PARALLEL MODE/SL”, and on
the LCD panel of the other UPS, you will see “PARALLEL MODE/MS” : (SL means SLAVE, MS
means MASTER)
The inputs of two UPS are connected to mains, outputs of two UPS are connected to each other,
there are two battery groups.
SB1 and SB3 static bypass switches work always together. They turn on/off together. If these static
switches are conducted,than the load is connected to mains directly.
SB2 and SB4 static switches work always together. If these static switchs are conducted,than the
load is connected to inverter. In this position current sharing is active.
If a failure occurs at one of the UPS, bypass system transfer load to by pass.
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