6-61
This
parameter can be changed during operation, but normally no adjustments are required. Make
ad
-
justments in the following cases:
If the wiring distance between the Inverter and the motor is long, raise the set value.
If the motor capacity is less than the Inverter capacity (the maximum application motor capacity),
raise the set value.
If the motor generates excessive vibration, lower the set value.
Set
the torque compensation gain so that the output current at low-speed rotation does not exceed
50%
of
the Inverter
’
s rated output current. If the setting exceeds
100% of the Inverter
’
s rated output current,
the Inverter may be damaged.
Parameter Display name Setting Units Default
Valid access levels
number
range setting
V/f
Control
V/f with
PG
Open Loop
Vector
Flux
Vector
C4-02 Torq Comp Time 0 to
10000
ms (See
note.)
Advanced ---
This parameter cannot be changed during operation.
Note When the control mode is switched, the factory default setting changes as follows:
V/f control: 200; V/f with PG: 200; open-loop vector 20
The
torque compensation time constant does not normally need to be adjusted, but make adjustments
in the following cases:
If the motor generates excessive vibration, raise the set value.
If motor responsiveness is low, lower the set value.
H Setting the Carrier Frequency (C6)
The carrier frequency characteristics differ according to the control mode.
V/f control and V/f with PG control: Carrier frequency variable setting possible.
Open-loop
vector control and flux vector control: Constant frequency (The carrier frequency
upper
limit only is set.)
The carrier frequency does not normally need to be adjusted, but make adjustments in the following
cases:
If
the wiring distance between the Inverter and the motor is long, lower the carrier frequency
. The
standards
are 15 mHz or less for a wiring distance of 50 meters or less; 10 mHz or less for 100 me
-
ters or less; and 5 mHz or less for over 100 meters.
If there are great irregularities in speed or torque, lower the carrier frequency.
Setting the Carrier Frequency and Inverter Overload “OL2”
For a 400-V Inverter, if the carrier frequency is set to a value higher than the default setting, the
Inverter
overload detection value will decrease in consideration
of an increase in the heat that will be
generated
by the change in the carrier frequency
. Since the detection value is set to decrease by
approximately
15% for an increase of 2 kHz, carefully set the frequency so that the rated motor cur
-
rent can be output.
Advanced Operation Chapter
6
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