38
SALICRU
4.
Set the OCB output switch to ‘On’ when required and,
immediately afterwards, the screen will require the MBCB
switch of the manual bypass to be set to ‘Off.’ The inverter
will start.
Fig. 51.
Set the OCB switch (above top) to ‘On’ and set
the MBCB switch (above bottom) to ‘Off.’
5.
As soon as the inverter starts, it will be possible to transfer
the load. Move the bypass switch to NORMAL when
required to do so by the screen to complete the startup of
the UPS.
Fig. 52.
Load transfer (above top) and end of restart from
manual bypass (above bottom).
6.4. REDUNDANT PARALLEL SYSTEM.
•
The redundant parallel system consists of n UPSs (up to a
maximum of 6 units) configured as redundant parallel units.
•
The manual bypass switch is internal to each UPS of the
system, which guarantees continuity of supply even if more
than one failure is detected. This is possible because all of
the units operate and constantly power the loads in parallel,
each of them providing a current equal to the total load/n.
The automatic balancing of the AC current distributes the
n currents evenly and reduces the unbalance to less than
10%.
•
The load is powered by the inverters in parallel even if an
instantaneous overload of less than 200% of the rated load
occurs.
•
In the event of a fault in one of the units, the load will be
powered by the rest. Only if failures are detected in other
units will the load be transferred to the emergency power
supply (bypass).
•
A parallel system with several connected UPS units has the
form shown below, where the current main or Master UPS
unit and those that have been added or Slaves (UPS n) are
shown.
Charge
Mains
Mains
Mains
Mains
Fig. 53.
Block diagram of a parallel system.
Summary of Contents for SLC X-PERT Series
Page 1: ...SLC X PERT 80 400 kVA UNINTERRUPTIBLE POWER SUPPLIES UPS USER MANUAL...
Page 8: ...8 SALICRU Fig 3 Front view of the 400 kVA model...
Page 34: ...34 SALICRU Fig 42 Connection of three UPSs through the CAN bus for 400 kVA devices...
Page 60: ...60 SALICRU...
Page 61: ...61 X PERT UNINTERRUPTIBLE POWER SUPPLIES UPS USER MANUAL...
