Ablerex KRONOS, Installation And Operation Manual, Page: 46 / 72

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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)