UM0432 datasheet(39/53 Pages) STMICROELECTRONICS

39 / 53 page

UM0432

Motor control operations

39/53

During any state: idle, start, run or brake, a blinking 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.

7.5.6

Changing the real-time parameters

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

Table 15 explains the potentiometer functionality based on the driving strategy.

If during the GUI configuration phase the "from RV1" control was unchecked, the value of

the duty cycle (or the value of the current reference) is not set by P1 but has a fixed value.

If during the GUI configuration phase the "from RV2 - RV3" control was unchecked, the

value of the rising delay coefficient and the value of the falling delay coefficient are not set by

P2 and P3 but have fixed values.

The maximum duty cycle allowed in voltage mode depends on the value of the PWM

frequency and the value of the PWM minimum off time set by the GUI.

Table 15.

Potentiometer functionality based on open/closed loop driving strategy

Voltage mode

Open loop

Closed loop

Sets the duty cycle percentage from 0% to the

maximum duty cycle allowed.

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)

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

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