Operation manual
www.zigor.com
30
40 kVA
In same way as lower power UPS, this UPS series adopts same positive and negative double battery structure
with common terminal, but in this case based on design and power, a totally configurable 32, 34, 36, 38 or 40pcs
in series can be done, depend on customer needs and autonomy. By this way it can be monitor battery state and
symmetry between both strings. It must be wired neutral battery terminal (BATN) on middle battery element (16º,
17º, 18, 19º or 20º). The battery sets between the positive terminal (BAT+) and neutral (BATN) are called positive
batteries and between neutral (BATN) and negative (BAT-) are called negative ones. Fig. 5-5
Fig. 5-5 External battery connections for 40 kVAs UPS
UPS parallel Installation
A group of paralleled UPS behaves as one large UPS system but with the advantage of presenting higher
reliability. In order to assure that all UPS are equally utilized and comply with relevant wiring rules, please follow
the requirements below:
1.
All UPS must be of the same rating and be connected to the same bypass source.
2.
The outputs of all the UPS must be connected to a common output bus.
3.
The length and specification of power cables including the bypass input cables and the UPS output
cables should be the same. This facilitates load sharing when operating in bypass mode.
The following sections introduce the installation procedures specified to the parallel system.
WARNING
Ensure correct polarity from battery string end connections to the battery breaker, and from the battery breaker
to the UPS terminals i.e. (+) to (+) / (-) to (-) Do not close the battery circuit breaker unless authorized by the
commissioning engineer.
