ZGR TOWER PRO 6 10 KVA
Operation manual
www.zigor.com
17
Battery mode (Stored Energy Mode)
If the AC mains input power fails, the inverter, which obtains power from the battery, supplies the critical AC load.
There is no power interruption to the critical load. The UPS will automatically return to Normal Mode when AC
supply recovers.
Bypass mode
If the inverter is out of order, or if overload occurs, the static transfer switch will be activated to transfer the load
from the inverter supply to bypass supply without interruption to the critical load.
In the event that the inverter output is not synchronized with the bypass AC source, the static switch will perform
a transfer of the load from the inverter to the bypass with power interruption to the critical AC load. This is to avoid
paralleling of unsynchronized AC sources. This interruption is programmable but typically set to be less than an
electrical cycle e.g. less than 15 ms (50 Hz) or less than 13,33 ms (60 Hz).
ECO Mode
When the UPS is at AC Mode and the requirement to the load is not critical, the UPS can be set at ECO mode in
order to increase the efficiency of the power supplied. At ECO mode, the UPS works at Line-interactive mode, so
the UPS will transfer to bypass supply.
When the AC is out of set window, the UPS will transfer from bypass to Inverter and supplies power from the
battery, and the LCD will show all related information on the screen.
Parallel redundancy mode (system expansion)
To achieve a higher capacity and / or increase reliability, the outputs of up to 4 UPS modules can be programmed
to operate in parallel. The built-in parallel controller in each UPS ensures automatic load sharing.
In case of one module fail, the other modules assume the power and loads could be run protected.
This is a great advantage compared to single UPS system, because in case of single UPS failure whole system
goes to bypass mode, and loads will not be protected from mains variations.
Please, check how much power needs to assumed by whole running parallel system in order to determine
maximum UPS quantity, and prevent to overload situation in case of module failure.
Parallel function setup
A group of paralleled modules behave as one large UPS system but with the advantage of presenting higher
reliability. In order to assure that all modules 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 Bypass and the Main input sources must be referenced to the same neutral potential.
3) The outputs of all the UPS modules must be connected to a common output bus.
4) 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 basic installation procedure of a parallel system comprising of two or more UPS modules is the same as that
of single module system. The following sections introduce the installation procedures specified to the parallel
system.
