Delta VFD4A8ME21ANNAA User Manual

Chapter 12 Description of Parameter SettingsME300
12.1-07-10

Automatic Energy-saving Setting
Default: 0
Settings 0: Disable
1: Enable
 When energy-saving is enabled, the motor acceleration operates with full voltage. During
constant speed operation, it automatically calculates the best voltage value according to the load
power. This function is not suitable for fluctuating loads or loads which are nearly full during
operation.
 When the output frequency is constant (that is, constant operation), the output voltage decreases
automatically as the load decreases. Therefore, the drive operates with minimum multiplication
of voltage and current (electric power).

Energy-saving Gain
Default: 100
Settings 10–1000%
 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
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.

Delta VFD4A8ME21ANNAA Specifications

General

Brand	Delta
Model	VFD4A8ME21ANNAA
Category	DC Drives
Language	English