AN1857 Freescale Semiconductor / Motorola, AN1857 Datasheet - Page 45

• Manufacturer Part Number: AN1857
• Description: A 3-Phase ac Induction Motor Control System Based on the MC68HC908MR32
• Manufacturer: Freescale Semiconductor / Motorola

AN1857
MOTOROLA
READ_CONST is accessed from the main software timer in READ_CONST
rate. The following sequence is performed. See
READ_CONST:
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All the inputs are scanned (speed pot, start/stop switch,
forward/reverse switch, temperature, dc bus current). dc bus
voltage is measure in AD interrupt routine.
The speed command is calculated according to the operational
mode.
The dc bus voltage is compared with the overvoltage limit and
overcurrent flag is checked.
In case of a fault condition, the fault recovery routine is entered
and until the recovery time expires; the drive remains disabled.
Finally, the LED driver controls individual LEDs according to the
status of the drive.
The PFC hardware is enabled/disabled according to the drive
status.
PC-Master commands are serviced.
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Figure 25
Application Note
Software
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