Omron SYSDRIVE 3G3MX-A2002, User Manual

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4-13
4-2 Function Mode
4
Functions
„
Torque Boost
• Compensates for the voltage drop caused by the motor primary resistance or by wiring and
suppresses torque reduction at a low speed range.
Manual Torque Boost [A042/A242, A043/A243]
• Adds the voltage characteristics set in A042/A242 and A043/A243 to the V/f characteristics, and
outputs the resulting voltage. The addition value is set in percentage terms based on the AVR
voltage selection (A082) as 100%.
• The manual torque boost frequency (A043/A243) is set in percentage terms based on the base
frequency as 100%.
• If you raise the set value of the manual torque boost, be careful about motor overexcitation.
Otherwise, the motor may burn out.
• Should such a situation occur, lower the set value of A042/A242.
Automatic Torque Boost (Intelligent Sensorless Vector Control)
• Automatically adjusts output voltage and output frequency according to the load status.
• To avoid a possible overcurrent trip during deceleration, set the AVR selection to "Always ON"
(A081: 00).
• Sufficient characteristics may not be obtained if you select two or more lower rank motor size than
specified.
0
Output voltage
(100%)
Manual torque
boost voltage
(A042/A242)
Manual torque boost
frequency (A043/A243)
Base frequency
(A003/A203)
Max. frequency
(A004/A204)
Output frequency (Hz)
V/f characteristics (e.g. VC)
Phenomenon Adjusting method Adjustment item
Insufficient torque at low
speed
(Motor does not run at
low speed.)
Gradually increase the voltage setting of the manual torque boost. A042/A242
Gradually increase the slip compensation gain of the automatic torque
boost.
A047/A247
Gradually increase the voltage compensation gain of the automatic
torque boost.
A046/A246
Reduce the set value of the carrier frequency. b083
Rotation speed lowers
when load is applied. Gradually increase the slip compensation gain of the automatic torque
boost.
A047/A247
Rotation speed
increases when load is
applied.
Gradually reduce the slip compensation gain of the automatic torque
boost.
A047/A247
Overcurrent trip occurs
when load is applied.
Gradually reduce the voltage compensation gain of the automatic
torque boost.
A046/A246
Gradually reduce the slip compensation gain of the automatic torque
boost.
A047/A247
Gradually reduce the voltage setting of the manual torque boost. A042/A242