Delta VFD300C43S-HS User Manual page 403

Energy-saving Gain

Settings
 When Pr. 07-21 is set to 1, use this parameter to adjust the energy-saving gain. The default is
100%. If the result is not satisfactory, adjust it by decreasing the setting value. If the motor
oscillates, then increase the setting value.
 In certain applications such as high-speed spindles, the temperature rise in the motor is a major
concern. When the motor is not in working state, reduce the motor current to a lower level.
Reduce this parameter setting to meet this requirement.
Auto Voltage Regulation (AVR) Function

Settings
 The rated voltage of the motor is usually 200V
input voltage of the AC motor drive may vary between 170V
50Hz/60Hz. 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 temperature, 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 200V
200V to 264V
AC
maximum of 200V
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 (V/F and SVC Control Mode)

Settings
 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 quick but the control may be unstable. Adjust the setting
according to the stability of the control and response times.
10–1000%
0: Enable AVR
1: Disable AVR
2: Disable AVR during deceleration
, then the drive automatically reduces the output voltage to the motor to a
AC
/ 50Hz. If the input voltage is at 170V
AC
0.001–10.000 sec.
Chapter 12 Description of Parameter SettingsC2000-HS
–240V (380V
AC AC
AC
AC
12.1-07-12
Default: 100
Default: 0
–480V ), 60Hz/50Hz and the
AC AC
–264V (323V
AC AC
/ 50Hz and the input voltage is at
to 200V , the output voltage to
AC
Default: 0.500
–528V ),
AC AC