Auto Voltage Regulation (Avr) Function; Auto Energy-Saving Operation - Delta VFD-VE User Manual

Chapter 4 Parameters

From the table, we see that the PWM carrier frequency has a significant influence on the
electromagnetic noise, AC motor drive heat dissipation, and motor acoustic noise.
Auto Voltage Regulation (AVR) Function
00-18
Control
VF VFPG
mode
Settings

It is used to select the AVR mode. AVR is used to regulate the output voltage to the
motor. For example, if V/f curve is set to AC200V/50Hz and the input voltage is from 200
to 264VAC, the output voltage won't excess AC200V/50Hz. If the input voltage is from
180 to 200V, the output voltage to the motor and the input voltage will be in direct
proportion.

When setting Pr.00-18 to 1 during ramp to stop and used with auto accel./decel.
function, the acceleration will be smoother and faster.

It is recommended to set Pr.00-18 to 0 (enable AVR) when the control mode is FOCPG
or TQCPG.
 Auto Energy-saving Operation
00-19
Control
VF VFPG
mode
Settings

When the Auto Energy-saving function is enabled, the drive will operate with full
voltage during acceleration and deceleration. At constant speed, the AC drive will
calculate the optimal output voltage value for the load. It is possible for the output
voltage to be 25% below Maximum Output Voltage during auto energy-saving operation.
This function should not be used with variable loads or continuous rated output loads.

When output frequency is constant, i.e. constant operation, the output voltage will be
auto decreased with load reduction. To make the AC motor drive runs under the energy-
saving with the minimum value of the product of voltage and current.
4-58
SVC FOCPG TQCPG
0 Enable AVR
1 Disable AVR
2 Disable AVR when deceleration stop
SVC FOCPG
0 Disable
1 Enable
Factory setting: 0
Factory setting: 0