ST STEVAL-IHM015V1, User Manual, Page: 39 / 53

UM0432 Motor control operations
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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
P1
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 )
P2 Sets the value of the rising delay coefficient from 0 to 255
P3 Sets the value of the falling delay coefficient from 0 to 255
P4 Not used
Current mode
Open loop Closed loop
P1
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 )
P2 Sets the value of the rising delay coefficient from 0 to 255
P3 Sets the value of the falling delay coefficient from 0 to 255
P4 Not used
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