AN1911 Freescale Semiconductor / Motorola, AN1911 Datasheet - Page 17

• Manufacturer Part Number: AN1911
• Description: 3-Phase AC Motor Control with V/Hz Speed Open Loop Using DSP56F80X
• Manufacturer: Freescale Semiconductor / Motorola

6.1.6 Fault Control
Inputs of the process:
Output of the process:
Results calculated by mcgen3PhWaveSine3rdHIntp function are directly passed to PWM Value
Registers using PWM driver.
This process is responsible for fault handling. The software accommodates five fault inputs:
overcurrent, overvoltage, undervoltage, overheating and wrong identified hardware.
Overcurrent: In case of overcurrent in DC-Bus link, the external hardware provides a rising edge on
the fault input pin FAULTA1 of the DSP. This signal immediately disables all Motor Control PWM’s
outputs (PWM1 - PWM6) and sets DC_Bus_OverCurrent bit of DriveFaultStatus variable.
Overvoltage: In case of overvoltage in DC-Bus link, the external hardware provides a rising edge on
the fault input pin FAULTA0 of the DSP. This signal immediately disables all Motor Control PWM’s
outputs (PWM1 - PWM6) and sets DC_Bus_OverVoltage bit of DriveFaultStatus variable.
Undervoltage: The DC Bus voltage sensed by ADC is compared with the limit within the software. In
case of undervoltage after a period defined by UnderVoltage_Count all Motor Control PWM outputs
are disabled and DriveFaultStatus variable is set to DC_Bus_UnderVoltage.
Overheating: The Temperature of the power module sensed by ADC is compared with the limit
within the software. In case of overheating after a period defined by OverHeating_Count all Motor
Control PWM outputs are disabled and DriveFaultStatus variable is set to OverHeating
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Figure 6-6. 3-ph Sine Waves with 3rd Harmonic Injection, Amplitude = 50%

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Amplitude - obtained from DC-Bus Ripple Elimination process
Omega_required - obtained from Acceleration/ Deceleration Ramp process
Indirect Power Factor Correction Using DSP56F80X
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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Software Design
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