10.3 Selecting an Inverter Drive Mode (HD/MD/LD)
10-18
10.3.2 Guideline for selecting inverter drive mode and capacity
Table 10.3-1 lists the differences between HD, MD, and LD modes. If the MD/LD mode specifications
satisfy the requirements in your application in view of the overload capability and functionality, you can
select the inverter one or two ranks lower in capacity than that of the motor rating.
Table 10.3-1 Differences between HD, MD, and LD modes
Function
HD mode MD mode
LD mode
(Applies to
5.5 kW or above)
Remarks
Application Heavy load Medium load Light load ―
Function
code
data
setting
(Switching
between HD,
MD, and LD
modes)
F80 = 0
(Factory default)
F80 = 2 F80 = 1
―
Continuous
current
rating level
(inverter rated
current level)
Capable of
driving a motor
whose capacity
is the same as
the inverter's.
Capable of
driving a motor
whose capacity
is one rank
higher than the
inverter's.
Capable of
driving a motor
whose capacity is
one or two ranks
higher than the
inverter's.
Overload
capability
150% for 1 min.
200% for 3 s
150% for 1 min 120% for 1 min
The MD-/LD-mode inverter
brings out the continuous
current rating level which
enables the inverter to
drive a motor with one or
two ranks higher capacity,
but its overload capability
(%) against the continuous
current level decreases.
For the rated current level,
refer to Chapter 12
"SPECIFICATIONS."
Maximum
frequency
Setting range:
25 to 500 Hz
Upper limit:
500 Hz
Setting range: 25 to 500 Hz
Upper limit: 120 Hz
In the MD/LD mode, if the
maximum frequency
exceeds 120 Hz, the actual
output frequency is
internally limited to 120 Hz.
DC braking
(Braking level)
Setting range:
0 to 100%
Setting range: 0 to 80%
Motor Sound
(Carrier
frequency)
Setting range:
0.75 to 16 kHz
(0.4 to 55 kW)
0.75 to 10 kHz
(75 to 400 kW)
0.75 to 6 kHz
(500, 630 kW)
Setting range:
0.75 to 2 kHz
(90 to 400 kW)
Setting range:
0.75 to 16 kHz
(5.5 to 18.5 kW)
0.75 to 10 kHz
(22 to 55 kW)
0.75 to 6 kHz
(75 to 500 kW)
0.75 to 4 kHz
(630 kW)
In the MD/LD mode, a
value out of the range, if
specified, automatically
changes to the maximum
value allowable in the
MD/LD mode.
Current limiter
(Level)
Initial value:
160%
Initial value:
145%
Initial value:
130%
Switching the drive mode
between HD, MD and LD
with function code F80
automatically initializes the
F44 data to the value
specified at left.
Current
indication and
output
Based on the
rated current
level for HD
mode
Based on the
rated current
level for MD
mode
Based on the
rated current
level for LD
mode
―
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