Chapter 12 Description of Parameter SettingsME300
Automatic Voltage Regulation (AVR) Function
Default: 0
Settings 0: Enable AVR
1: Disable AVR
2: Disable AVR during deceleration
The rated voltage of a 220V motor is usually AC 200 V, 60 Hz / 50 Hz, and the input voltage of
the AC motor drive may vary from AC 180 V to 264 V, 50 Hz / 60 Hz. Therefore, when the AC
motor drive is used without the AVR function, the output voltage is the same as the input voltage.
When the motor runs at the voltage exceeding 12–20% of the rated voltage, it causes higher
temperatures, damaged insulation, and unstable torque output, which result in losses due to
shorter motor lifetime.
The AVR function automatically regulates the output voltage of the AC motor drive to the motor
rated voltage. For example, if the V/F curve is set at AC 200 V, 50 Hz and the input voltage is at
AC 200–264 V, then the drive automatically reduces the output voltage to the motor to a maximum
of AC 200 V, 50 Hz. If the input voltage is at AC 180–200 V, the output voltage to motor and input
power are in direct proportion.
0: When the AVR function is enabled, the drive calculates the output voltage according to the
actual DC bus voltage. The output voltage does NOT change when the DC bus voltage changes.
1: When the AVR function is disabled, the drive calculates the output voltage according to the
actual DC bus voltage. The DC bus voltage changes the output voltage, and may cause
insufficient or over-current or shock.
2: The drive disables the AVR function when decelerating to stop, and may accelerate to brake.
When the motor ramps to stop, the deceleration time is shorter when setting this parameter to 2
with auto-acceleration and deceleration, and the deceleration is quicker and more stable.
Torque Command Filter Time
Default: 0.050
Settings 0.001–10.000 sec.
IMV/F and PMSVC Control Mode only.
When the setting is too long, the control is stable but the control response is delayed. When the
setting is too short, the response is quicker but the control may be unstable. Adjust the setting
according to the stability of the control and response times.
Slip Compensation Filter Time
Default: 0.100
Settings 0.001–10.000 sec.
IMSVC Control Mode only.
Change the compensation response time with Pr.07-24 and Pr.07-25.
If you set Pr.07-24 and Pr.07-25 to 10 seconds, the compensation response time is the slowest;
however, the system may be unstable if you set the time too short.
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