Ups Parallel Connections (Option) - Ablerex KRONOS Installation And Operation Manual

2.7

UPS Parallel Connections (Option)

The Kronos UPS may be operated in parallel to increase it's capacity and also adds redundantcy
and increases the systems reliability.
Up to 6 UPS units may be connected and operated in parallel.

Each UPS requires the additional of the parallel card (Option).

The size and length of the AC input and output cables must be identical for all UPS units.

The phase rotation must be the same for each UPS unit.

It is recommended to use an external bypass cabinet to facilitate maintenance and system

testing for parallel operation system.
Parallel configuration must be performed by authorized and qualified technicians who are

familiar with this the Kronos UPS.
Parallel cables must installed in order for each to UPS to communicate with each other.

Only use the parallel communication cables which are supplied with Kronos UPS to ensure

that the UPS will operate properly in a parallel configuration.
The parallel communication cables must be connected in a ring configuration. The

maximum total length of the parallel communication cables must be less than 38 meters. To
ensure good communication quality you must set the Switch & SW3 of the two furthest
UPS to the "ON" position as shown in below. (Please reference to section 2.6 for SW3)
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