UM0324 datasheet(33/105 Pages) STMICROELECTRONICS

33 / 105 page

UM0324

Running the demo program

33/105

Set the DC source at low voltage (50V).

Run the system in closed loop operation, and on the LCD, observe the target and

measured speeds.

The error occurs if the sign of the measured speed is opposite to the sign of the target

speed. (For help with the LCD menus see Section 3.2 on page 29):.

If the error occurs, you can correct it by simply swapping and rewiring the encoder

output signals.

If this isn’t practical, you can modify a software setting instead: in the 75x_encoder.c

file, replace the code line:

TIM_InitStructure.TIM_IC1Polarity = TIM_IC1Polarity_Rising;

with:

TIM_InitStructure.TIM_IC1Polarity = TIM_IC1Polarity_Falling;

3.5

Fault messages

This section provides a list of possible fault message that can be displayed on the LCD

when using the software library together with the STR750MC-KIT:

●

“Over Current”

An Emergency Stop was detected on the PWM peripheral dedicated pin. If using

STR750-MCKIT it could mean that either the hardware over temperature protection or

the hardware over current protection were triggered. Refer to the STR750-MCKIT User

Manual for details,

●

“Over Heating”

An over temperature was detected on the dedicated analog channel; the digital

threshold NTC_THRESHOLD and the relative hysteresis (NTC_HYSTERESIS) are

specified in the MC_Misc.c source file. Refer to the STR750-MCKIT User Manual for

details.

●

“Tacho timed out”

The speed feedback timed out. Verify speed sensor connections.

●

“Start up failed”

The motor ramp-up failed. Refer to Section 3.1 and Section 3.2 for in-depth information,

●

“Bus Over Voltage”

An over voltage was detected on the dedicated analog channel. The digital threshold

(OVERVOLTAGE_THRESHOLD) is specified in the MC_Misc.c source file. Refer to the

STR750-MCKIT User Manual for details.

●

"Bus Under Voltage"

The bus voltage is below 20V DC. This threshold is specified in the

UNDERVOLTAGE_THRESHOLD

parameter in the MC_Misc.c source file.

Note:

The corresponding FAULT flag is not cleared by firmware, therefore the STR750 must be

reset after the bus voltage has been switched on.

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