Veichi JT550 Series Manual page 99

JT550 Series Inverter Manual
Excitation adjustment
F5.13
proportional gain
Excitation adjustment integral
F5.14
Torque adjustment proportional
F5.15
F5.16 Torque adjustment integral gain
These function parameters are vector control current loop PI parameters. They are obtained from
motor auto-tuning. Adjustment of these parameter is not required normally.
The dimension of current loop integral regulator is integral gain rather than integral time. Very large
current loop PI gain may lead to control loop oscillation. When current oscillation or torque fluctuation is
great, decrease the proportional gain or integral gain.
Group F6: V/F Control Parameters
F6.00
0: Linear V/F
It is applicable to common constant torque load.
1: Multi-point V/F
It is applicable to special load such as dehydrator and centrifuge. Any such V/F curve can be obtained
by setting parameters of F6.03 to F6.08.
2: Square V/F
3: 1.2-power V/F
4: 1.4-power V/F
6: 1.6-power V/F
8: 1.8-power V/F
2 to 8 is suitable for fans, pumps, centrifugal loads
F6.01
F6.02 Cut-off frequency of torque boost
The torque compensation function compensates for insufficient torque production at low frequency.
F6-01 compensates for insufficient torque production by boosting output voltage of the AC drive. But
very large setting will result in motor overheat and AC drive over-current.
●On starting a heavy load and insufficient torque is experienced, increase the torque boost in F6-01.
● Decrease this parameter on light loads to avoid overheating the motor. F6-02 sets the cutoff frequency.
The torque boost function is disengaged when the output frequency exceeds the cutoff point.
F6.03 Multi-point V/F frequency 1
F6.04 Multi-point V/F voltage 1
F6.05 Multi-point V/F frequency 2
F6.06 Multi-point V/F voltage 2
F6.07 Multi-point V/F frequency 3
F6.08 Multi-point V/F voltage 3
These six parameters are used to define the multi-point V/F curve.
The multi-point V/F curve is set based on the motor's load characteristic. The relationship between
voltages and frequencies is:V1 < V2 < V3, F1 < F2 < F3
At low frequency, higher voltage may cause overheat or even burnt out of the motor and overcurrent
stall or overcurrent protection of the inverter.
gain
gain
V/F curve setting
Torque boost
Range:0~60000
Range:0~60000
Range:0~60000
Range:0~60000
Range:0~8
Range:0.0~30.0
Range:0.00Hz~max.freq
Range:0.00Hz~F6.05
Range:0.0%~100.0%
Range:F6.03~F6.07
Range:0.0%~100.0%
Range:F6.05~rated motor
frequency （F1.04）
Range:0.0%~100.0%
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Chapter 7 Maintenance and Troubleshooting
Default:2000
Default:1300
Default:2000
Default:1300
Default:0
Default:Model
dependent
Default:50.00Hz
Default:0.00Hz
Default:0.0%
Default:0.00Hz
Default:0.0%
Default:0.00Hz
Default:0.0%