MC3PHAC Datasheet, PDF (38/44 Pages) Motorola, Inc – 3-Phase AC Motor Controller

MC3PHAC/D
Freescale Semiconductor, Inc.
• RevSteady — This state is entered from the RevAccel state after the
actual motor speed has reached the requested speed defined by the
Speed In variable. In this state, the motor is held at a constant reverse
speed.
• RevDecel — This state is entered from the RevAccel or RevSteady
states whenever a CmdStop or CmdFwd command is received. This
state can also be entered from the RevSteady state if the Speed In
variable is decreased below the actual current speed. In this state, the
motor is decelerated in reverse according to the chosen parameters.
• SetBaseFreq — This state is entered from any state whenever a
CmdBaseFreqxx command is received. In this state, the motor
frequency at which full voltage is applied is configured and the state is
then automatically exited and the original state is re-entered.
• SetAccel — This state is entered from any state whenever a write to the
Acceleration variable occurs. In this state, the motor acceleration is
configured and the state is then automatically exited and the original
state is re-entered.
• SetSpeed — This state is entered from any state whenever a write to
the Speed In variable occurs. In this state, the requested motor speed is
configured and the state is then automatically exited and the original
state is re-entered.
• Fault — This state is entered from any state whenever a fault condition
occurs (see Fault Protection on page 16). In this state, the PWM
outputs are driven off (unless the fault state was entered from the
PWMHighZ state, in which case, the PWM outputs remain in the High Z
state). When the problem causing the fault condition is removed, a timer
is started which will wait a specified amount of time (which is user
programmable) before exiting this state. Under normal operating
conditions, this timeout will cause the Fault state to be automatically
exited to the PWM0RPM state, where motion will once again be initiated
if a CmdFwd or CmdRev has been received. The exceptions to this rule
are the cases when the Fault state was entered from the PWMHighZ or
PWMOFF states, in which case, exiting from the Fault state will return
back to these states.
38
3-Phase AC Motor Controller
MOTOROLA
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