UM0432 datasheet(46/53 Pages) STMICROELECTRONICS

46 / 53 page

Motor control operations

UM0432

46/53

Note:

Turning the P3 potentiometer modifies the "phase shift" parameter. To optimize driving, the

correct value of this parameter must be set. Finding the optimum value of the "phase shift"

can be useful to monitor the DC current provided by the power supply. You should try to

fine-tune the P3 potentiometer to minimize current absorption. When this parameter has

been found, the potentiometer P3 can be left at this value for all future tests.

During any state: idle, start, run or brake, a blinking red LED indicates a fault condition. A

fault condition is due to one of the following:

●

hardware overcurrent: current flowing inside the motor reaches a value greater than the

maximum allowed current of 7.65 A (see Section 7.4.16).

●

Over-voltage: the bus voltage reaches a value greater than 29 Vac.

●

Over-temperature: the on-board temperature sensor measures a temperature greater

than 110° C.

●

Start-up failed: no signal is received from the sensors at the end of the start-up

sequence.

●

Motor stalled: during the running of the motor no sensor signal has been observed.

7.7.6

Changing the real-time parameters

The real-time parameters can be changed using the control board’s potentiometers.

Table 22 explains the potentiometer functionality based on the driving strategy.

If during the GUI configuration phase the "set phase shift according to Pf/F curve" control

was checked, the value of the "phase shift" is not set by P3 but is calculated at run-time

based on the Pf/F curve (see Section 7.4.7).

The maximum current allowed by the GUI has been set to 8 A (see Section 7.4.8).

7.7.7

Stopping the motor (LED action)

Push the Start/Stop button to stop the motor. The LEDs toggle from green to red to indicate

an "idle" state.

Table 22.

Potentiometer functionality based on an open-/closed-loop driving strategy

Open loop

Closed loop

Sets the voltage modulation index from 0% to 100%

of the bus voltage.

Sets the target rotor frequency value from the

minimum value to the maximum value configured

(see Section 7.4.6).

Not used

Manual setting of the phase shift. The maximum CCW position is 0° of the phase shift and the maximum

CW position is 360° of the phase shift.

Not used

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