UM0432 datasheet(43/53 Pages) STMICROELECTRONICS

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UM0432

Motor control operations

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After power-on, the control board’s green LED should blink, signaling that the firmware has

started to run. After a while a green LED stays on indicating an "idle" state.

7.6.4

Setting the potentiometers

Before running the motor, the three potentiometers P1, P2, P3 must be set (see Table 19 for

the correct configuration).

7.6.5

Running the motor (LED action)

Push the Start/Stop button. After pushing the button the LEDs toggle from green to red to

indicate a "run" state. The motor starts running.

During any state: idle, start, run or brake, a still red LED together with the brake of the motor

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: the start-up phase ends without getting a sufficient number of valid zero

crossing events.

●

Motor stalled: during the running of the motor no zero crossing events have been

observed.

Note:

Blinking of the red LED during the running of the motor indicates that a software current

limitation is in action.

7.6.6

Changing the real-time parameters

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

Table 19 explains the potentiometer functionality based on the driving strategy.

Table 19.

Potentiometer functionality based on open/closed loop driving strategy

Voltage mode

Open Loop

Closed loop

Sets the duty cycle percentage from 0% to 100%.

Sets the target rotor frequency value from the

minimum value to the maximum value configured

(see Section 7.4.4).

Sets the value of the rising delay coefficient from 0 to 255

Sets the value of the falling delay coefficient from 0 to 255

Not used

Current mode

Open loop

Closed loop

Sets the current reference value from 0 A to the

maximum current allowed.

Sets the target rotor frequency value from the

minimum value to the maximum value configured

(see Section 7.4.4).

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