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Chapter 12 Helpful information
Industrial and Network / IT mode
Industrial mode
By default on EMEA products
•
Overload & Inrush current always causes a transfer to bypass mode.
•
In industrial mode, the philosophy is to transfer to Bypass as soon as possible (priority
•
is load service continuity). Then return to inverter when overload or inrush decreases
to normal.
Network [IT] mode
By default on US products
•
Overload & Inrush current are managed by the inverter if at all possible.
•
In Network mode, the philosophy is to provide a good quality signal to the load as
•
long as possible (priority is not to transfer to unprotected Bypass unless forced to do so
due to inverter constraints).
Differences between Industrial and IT mode
The unit is set to IT mode by default. Industrial mode starts the output on bypass power as
soon as the input mains is energized. Once the power button of the UPS is set, the load will be
supported by the UPS online double conversion circuitry. The overall intention in IT mode is to
switch to bypass such that any current fault can be cleared upstream from the UPS and
continue to support the load.
Industrial mode: the philosophy is to transfer to Bypass as soon as possible (priority
•
is load service continuity)
Overload and Inrush current (short circuit) always transferred on bypass
Network mode: the philosophy is to provide a good quality signal to the load as long
•
as possible (priority is not to transfer to unprotected Bypass).
Overload and Inrush current (short circuit) are managed by the inverter
The voltage and frequency range where transfer to bypass is a defined range on each product
– for example, a 120 V output UPS may have a bypass range from 90 V to 140 V – some
228
6U Rack or Tower UPS RT8kVA and RT11kVA IUOMG
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