4-2 Function Mode •If the automatic torque boost cannot provide the desired characteristics, adjust each item, as shown in the following table. 4 Functions Control Method (V/f Characteristics) You can set V/f characteristics (output voltage/output frequency). * To switch to the 2nd/3rd control, allocate 08 (SET)/17 (SET3) to the desired multi-function input and then turn it on. *1. Refer to "Sensorless Vector Control" (page 4-111). *2. Refer to "0-Hz Sensorless Vector Control" (page 4-112). 4-21 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 Parameter No. Function name Data Default setting Unit A044 V/f characteristics selection 00: Constant torque characteristics (VC) 01: Special reduced torque characteristics (Special VP) 02: Free V/f characteristics (Only A044/A244 can be set.) 03: Sensorless vector control (SLV) (Only A044/A244 can be set.*1) 04: 0-Hz sensorless vector control (Only A044/A244 can be set.*2) 05:
Sensor vector control (V2) (Only A044 can be set.) 00 A244 *2nd V/f characteristics selection A344 *3rd V/f characteristics selection Related functions A046, A246, A047, A247, A082, H003, H203, H004, H204