Prevention Of Motor Current Oscillation At Light Load; Stall Prevention Control Switching; Max Output Voltage Modulation Rate; Fine Adjustment Of Frequency Setting Signal - Toshiba TOSVERT VF-PS1 Instruction Manual

6.22.2 Prevention of motor current oscillation at light load


• Function
When a motor is in unstable with light load, this parameter can change the motor gain to make motor
condition stable. First set  =and check the motor condition. Please set  to  in case motor
needs more stable condition.This parameter is effective only in V/F control mode ( =,,)
[Parameter setting]
Title


6.22.3 Stall prevention control switching

 : Stall prevention control switching
• Function
The operation of the stall prevention control can be switched. Set
are displayed when acceleration and the deceleration are switched.
This parameter is effective at only V/f control mode(=,,).
[Parameter setting]
Title

6

6.22.4 Max output voltage modulation rate

 : Max output voltage modulation rate
• Function
In the case that Inverter output voltage drops and output current exceeds motor rating current at the frequency
higher than base frequency, Change this parameter setting and check whether the output current is reduced.
[Parameter setting]
Title

6.23

Fine adjustment of frequency setting signal

 : VI/II input bias
 : VI/II input gain
 : RR/S4 input bias
 : RR/S4 input gain
 : RX input bias
• Function
These parameters are used to fine adjust the relation between the frequency setting signal input through
the analog input terminal and the output frequency.
Use these parameters to make fine adjustments after making rough adjustments using the parameters
~.
The figure below shows the characteristic of the frequency setting signal input through the analog input terminal and
that of the output frequency.
: Motor oscillation control
Function
Motor oscillation control
Function
Stall prevention control switching
Function
Max output voltage modulation rate
Adjustment range
0:Disabled, 1:Enabled(Low gain)
2:Enabled(Middle gain)
3:Enabled(High gain)
=1 when the overvoltage trip etc.
Adjustment range
: Stall prevention control
: Stall prevention control 2
Adjustment range
0:Standard, 1:100%
2:102.5%, 3:105%
 : RX input gain
 : Optional AI1 input bias
 : Optional AI1 input gain
 : Optional AI2 input bias
 : Optional AI2 input gain
F-42
E6581386
Default setting

Default setting

Default setting
