# Toshiba TOSVERT VF-AS1 Manual

Current and speed control gain adjustment method

E6581333
TOSVERT VF-AS1/PS1
Current and speed control gain adjustment method

#### Summary of Contents for Toshiba TOSVERT VF-AS1

• Page 1 E6581333 TOSVERT VF-AS1/PS1 Current and speed control gain adjustment method...
• ### Page 2: Related Parameters

E6581333 1. Introduction Thank you for purchasing a TOSVERT VF-AS1/PS1 industrial inverter. This instruction manual explains the functions of the VF-AS1/PS1’s parameters f458 through f466. 2. Function 2-1. Control gain adjustment function (f458 to f462) When the inverter is operated in automatic torque boost mode or vector control mode (setting of parameter pt: 2, 3, 4, 7 or 8), the speed response can be optimized according to the inertia of the load and vibrations can be reduced.
• Page 3 E6581333 4. Adjustment 4-1. How to adjust the speed control gain This section explains how to adjust the speed control gain-related parameters (f458, f460, f461, f462). By default, the response is set at approximately 5Hz based on the assumption that the inertia of the load is almost the same as the inertia of the motor (CPU versions of VF-AS1 is 124 and later).
• Page 4 E6581333 To increase the response in the state in (1) by a factor of K f460= K × f460 f461= 1/K × f461 (Example of setting) If f461 is set to 500 in (1) To further increase the response by a factor of 2, set  to the following value (default value): f460= 2 ×...
• Page 5 E6581333 4-1-2. If the inertia of the load is unknown, but there is a waveform measuring device such as an oscilloscope available (1) Connect the probes of the measuring device to the analog monitor output terminals (FM terminal-CC terminal) of your inverter. Then, change the FM terminal output setting to 6: speed feedback (real time value).
• Page 6 E6581333 4-1-4. Adjusting the moment of inertia of the load (f462) The parameter for the adjustment of the moment of inertia of the load is effective in preventing a rapid change in acceleration during acceleration or deceleration. When a machine with a high-inertia load is accelerated or decelerated, speed may overshoot the specified limit because of a change in acceleration, especially at acceleration and deceleration stop points.
• Page 7 E6581333 If the operation frequency is equal to or lower than the switching frequency (f466: Speed PI switching frequency): Enable parameters f460, f461 and f462. If the operation frequency is higher than the switching frequency (f466: Speed PI switching frequency): Enable parameters f463, f464 and f465.