11
ENGLISH
MASTERYS
BC 60-80 kVA - Ref.: IOMMASBCXX06-EN 06
ENGLISH
2. UNPACKING AND INSTALLATION OF THE UNIT
2.7. UPS PARALLEL CONFIGURATION
2.7.1. General
Parallel connection enhances UPS system reliability, performance and power.
All MASTERYS BC models can be installed in parallel configuration provided they have the special parallel kit that can be installed
in the factory or later by specialist personnel.
UPS modules for parallel operation are identical to standard UPS modules, as a result safety, shipping and installation recommen-
dations in chapters 1 and 2 also apply.
2.7.2. Installation
UPS units operating in parallel are interconnected using control cables
B
(fig. 2.7.3-1) and are configured differently depending on
the position they are assigned.
For this reason the units have a position label
C
(Fig. 2.8-1):
• The LEFT label means that the unit must be positioned to the left.
• The RIGHT label means that the unit must be positioned to the right.
The control cables supplied allow a maximum distance of about 3 metres between the UPS units. This gives enough room for an
external battery cabinet to be inserted beside each UPS.
2.7.3. Power
connections
• The power supply to each unit must be protected as indicated in the table in paragraph 2.3.
• The cross section and length of the input and output cables must be identical for all the units.
• The phase rotation must be the same for each unit connected in parallel and also on any external manual bypass line.
• Cables of the same length and cross section must be used for the connection between the general power switch
A
, the switches
C
and the respective UPS units. The length of the cables from
A
to each UPS module must not exceed 25 metres (Fig. 2.7.3-1).
• The cables from the UPS module to switch
F
must be of the same length (max. 7.5 metres) with multi-core cables.
• If a differential switch is installed on the mains power switch (optional), it must be inserted upstream from the distribution panel
(see fig. 2.7.3-1, detail
H
), it must be a selective type and the trigger value must be 0.5 A multiplied by the number of UPSs
connected in parallel.
Only activate switch D after carrying out the procedure for switching onto the maintenance bypass.
Only activate switch E after turning off the UPS.
