10.3 Selecting an Inverter Drive Mode (HD/MD/LD)
10-17
Chapter 10 SELECTING OPTIMAL MOTOR AND INVERTER CAPACITIES
10.3 Selecting an Inverter Drive Mode (HD/MD/LD)
10.3.1 Precaution in making the selection
A FRENIC-MEGA inverter is available in three different drive modes--HD (High Duty: for heavy duty load
applications), MD (Medium Duty: for medium duty load applications), and LD (Low Duty: for light duty load
applications), which allows users to switch the drive modes on site.
Select the inverter drive mode appropriate to the user application, considering the motor capacity, overload
characteristics, and HD/MD/LD mode referring to Section 10.3.2 "Guideline for selecting inverter drive
mode and capacity."
HD mode designed for heavy duty load applications
Apply to general-purpose 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 3 seconds.
MD mode designed for medium duty load applications
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.
LD mode designed for light duty load applications
Apply to variable load equipment such as fans, pumps, and centrifugal
machines 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.
The LD mode is available only in inverters with a capacity of 5.5 kW or above, and the MD mode, in the
400 V class series of inverters with 90 kW or above.
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