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Chapter 12 Helpful information
The measurement of leakage current is also defined within the UL specification and requires
the setup to be exactly as shown; otherwise the measurement is inaccurate. In addition,
leakage current is additive, so the leakage current of connected loads to the UPS add to the
UPS leakage current.
Notes:
The test transformer for isolation is mandatory for measuring the UPS leak current
•
The leak current for a 3:1 UPS unit must be measured on input phase by input phase
•
High Efficiency Mode
High Efficiency Mode, in short HE Mode, is a mode of UPS operation that cuts energy usage
and operating costs. In HE Mode the is UPS running as a Line Interactive UPS – feeding the
input to the output loads and monitoring the input. If the input goes beyond the voltage or
frequency ranges, the UPS will revert back to Online double conversion.
Note: If the UPS unit is run in High Efficiency mode, then it is strongly recommended to install
voltage and frequency stabilisers as the UPS works as line-interactive UPS unit.
6U Rack or Tower UPS RT8kVA and RT11kVA IUOMG
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