10.4 Selecting an Inverter Drive Mode (ND/HD/HND/HHD)
10.4.1 Precaution in making the selection
The FRENIC-Ace is available in four different drive modes--ND and HD modes for general load and HND and HHD
modes for heavy duty load, which allows users to switch the drive modes on site.
Select the inverter capacity appropriate to the user application, considering the motor capacity, overload
characteristics, and ND/HD/HND/HHD mode, referring to “10.4.2 Guideline for selecting inverter drive mode and
capacity.”
ND mode for general load
Apply to equipment where the inverter’s load current in normal operations is less than the inverter rated current and
the load current in overcurrent operation is less than 120% of the rated current for 1 minute. (fan, pump, etc.)
HD mode for heavy duty load
Apply to equipment where the inverter’s load current in normal operations is less than the inverter rated current and
the load current in overcurrent operation is less than 150% of the rated current for 1 minute. (wire drawing machine,
etc.)
HND mode general load
Apply to equipment where the inverter’s load current in normal operations is less than the inverter rated current and
the load current in overcurrent operation is less than 120% of the rated current for 1 minute. This mode is for
applications which require running the motor under low noise conditions or running the inverter with high
responsibility. (fan, pump, centrifugal machine, etc.)
HHD mode for heavy duty load
Apply to equipment where the inverter’s load current in normal operations is less than the inverter rated current and
the load current in overcurrent operation is less than 150% of the rated current for 1 minute and 200% for 0.5
second. This mode is for applications which require running the motor under low noise conditions or running the
inverter with high responsibility. (compact hoist, winding machine, etc.)
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