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MASTERYS BC 15-40 kVA - Ref.: IOMMASBCXX09-EN 01
2. UNPACKING AND INSTALLATION OF THE UNIT
2.8. ISOLATION TRANSFORMER
If an external isolation transformer cabinet is required, the following instructions should be followed:
• Refer to chapters 1 and 2 of this manual for indications on moving and installing the cabinet.
• See paragraph 2.4 for details about protection devices.
• The protection cable marked with the ground symbol is connected directly to the distribution panel.
• The transformer can either be connected to the UPS input or output.
The UPS must not operate without the neutral connection to the input.
The transformer cannot be connected to the output on individual UPS units connected in parallel configuration.
For connection details refer to the transformer terminal board diagram.
2.9. UPS PARALLEL CONFIGURATION
2.9.1. General
Parallel connection enhances UPS system reliability, performance and power.
All 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
'Safety' and 'Unpacking and installation of the unit' chapters.
For 3/1 versions only two units in parallel are allowed.
2.9.2. Installation
UPS units operating in parallel are interconnected using control cables B (fig. 2.9-1) and are configured differently depending on
the position they are assigned.
For this reason the units have a position label C (Fig. 2.10-1):
• 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 INTERNAL label (used only on systems with three) means this unit must be positioned between the two other cabinets.
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.
2.9.3. Power connections
• The power supply to each unit must be protected as indicated in the table in paragraph 'Electrical requirements'.
• The cross section and length of the input and output cables must be identical for all 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.
• The cables from the UPS module to switch F must be of the same length (max. 15 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 (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.
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