Datasheet

AN1208

FIGURE 9: INSTALL FEEDBACK

CURRENT SELECTION

RESISTORS

4. Remove the LK2 jumper connection and place a

link on jumper LK1.

5. Place jumper LK4 in the 1-2 position.

6. Place jumpers on link LK5 through LK12.

System Execution Procedure

Complete the following steps to execute the integrated

PFC and Sensorless FOC algorithm that controls the

motor:

1. Launch the MPLAB software and open the

program.

2. Run the algorithm.

3. Apply AC input voltage to the dsPICDEM MC1H

High Voltage Power module.

4. Make sure VR2, the Speed Reference POT, is in

its minimum position and VR1, the Initial Torque

Reference POT, is set between the 0% and 25%

position.

5. Start the motor by pressing the S4 switch.

The motor starts in Open Loop mode and ramps

up the speed until it is equal to 900 rpm, and

then makes a transition from Open Loop mode

to Closed Loop mode.

6. When the motor enters Closed Loop mode and

stabilizes, start the PFC calculations by pressing

the S7 switch.

The DC bus voltage boosts from its initial value

based on the amplitude of the applied AC input

voltage.

7. Change values of the VR2 POT to operate the

motor at a different speed.

8. Stop the motor by pressing the S4 switch.

To obtain feedback current, the circuit links must

be completed.

To activate the current feedback for this

application, populate links LK20, LK21, and LK31

with 5.6 kΩ resistors.

LK20, LK21, and LK31 Links

5.6 kΩ Shunt Resistors

BEFORE

AFTER