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1.1 PRECAUTIONS FOR OPERATION
FR-HC Function
The FR-HC high power factor converter provides three functions
1) Inverter generated mains harmonics reduction
See the Power harmonic guideline section below.
2) Near unity power factor at 100% load
Gives better efficiency and lower stress on power line components.
3) Regeneration of load to the mains power supply
The FR-HC can continuously regenerate converter rated current to the power supply, for example from
a ‘back-driving’ load such as a down escalator. This gives very efficient full 4-quadrant control of the
AC motor from the inverter without the need for brake resistors or braking units etc.
1.1.1 Japanese harmonic suppression guideline
Harmonic currents flow from the inverter to a power receiving point via a power transformer. The harmonic
suppression guideline was established to protect other consumers from these outgoing harmonics.
1) “Harmonic suppression guideline for household appliances and general-purpose products”
200V class inverters of 3.7kW and less are covered by this guideline. Install a power factor improving
reactor to comply with this guideline.
2) “Harmonic suppression guideline for specific consumers”
This guideline sets forth the maximum values of harmonic currents outgoing from a high-voltage or
specially high-voltage consumer who will install, add or renew harmonic generating equipment. If any
of the maximum values is exceeded, this guideline requires that consumer to take certain suppression
measures.
Table 1 Maximum Values of Outgoing Harmonic Currents per 1kW Contract Power
Received
Power
Voltage
5th 7th 11th 13th 17th 19th 23rd
over
23rd
6.6kV 3.5 2.5 1.6 1.3 1.0 0.9 0.76 0.70
22kV 1.8 1.3 0.82 0.69 0.53 0.47 0.39 0.36
33kV 1.2 0.86 0.55 0.46 0.35 0.32 0.26 0.24
Incorrect handling might cause the equipment to operate improperly, its life to be reduced
considerably, and in the worst case, the high power factor converter and inverter to be
damaged. Please handle the unit properly in accordance with the information on each
section as well as the precautions and instructions of this manual.