Omron SYSDRIVE 3G3FV User Manual page 235

Advanced Operation
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 p y
number
C4-02 Torq Comp Time
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.
Setting g Units Default
range setting
0 to ms (See
10000 note.)
Valid access levels
V/f V/f with Open Loop
Control PG
Advanced
Chapter 6
Flux
Vector Vector
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