Site Verification And Installation Instructions; The Power+ Always Requires A Neutral Line; A 4-Pole Switch Might Disconnect The Neutral Line - Gamatronic POWER+ User Manual

3. S
ITE VERIFICATION
AND INSTALLATION INSTRUCTIONS
Note: Please refer to the system connection schematic Figure 8 on page 15.
•
This document describes the site conditions and infrastructure
verification checks that are required to ensure the safe and reliable
operation of the equipment supplied by Gamatronic Electronic
Industries Ltd.
•
Site conditions must comply with Gamatronic specifications for the
equipment to be installed.
•
All electrical connections, grounding, circuit breakers, wire types,
diameters and terminations, and related items must meet the
requirements of local electrical codes and regulations and applicable
International standards.
•
Failure to comply with these requirements may void all warranties and
liabilities on behalf of Gamatronic Electronic Industries Ltd.
3.1

The Power+ always requires a neutral line

During both installation and operation of the Power +, a neutral line must always be connected to the
UPS. This neutral line shall be connected during the entire period that the UPS is working, and shall not
be disconnected at any time!
Caution: If at any time the neutral line becomes disconnected, there will be no input or output reference
voltage, because the input neutral line and the output neutral line are physically linked together. That may
result in system defining its own reference voltage, which will be set by the load distribution between the
three phases. This can result in serious damage to the UPS.
3.1.1

A 4-pole switch might disconnect the neutral line

WARNING! If you have a mains-to-generator four-pole switching system, you are in danger of having
the neutral line disconnected when the four-pole switch is operated. This can result in the problems
described above.
To avoid these problems, we strongly recommend that, if you use a four-pole mains-to-generator
switching system, you install an isolation transformer that will constantly provide the UPS with a neutral
line.
Figure 4 on page 9 illustrates the wrong way to connect the UPS with a grounded-neutral generator.
Figure 5 on page 10 illustrates an acceptable connection solution if you already have a grounded-neutral
generator.
Figure 6 on page 11 shows the preferred generator (neutralized, not grounded) and the preferred
connection (three-pole).
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G E I
AMATRONIC LECTRONIC NDUSTRIES
L .
TD
POWER +
UPS,
PARALLEL USER GUIDE
, . 2.0
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