December 2001 The Control Loop 6 – 147
6.8.5 Current Controller (Only TNC 426 PB/M, TNC 430 PA/M)
Analog current controllers are integrated in the TNC 426 PB, TNC 430 PA:
n TNC 426 PB: analog current controller for 5 axes and 1 spindle
n TNC 430 PA: analog current controller for 6 axes and 1 spindle
n TNC 426 M: analog current controller for 5 axes and 1 spindle
n TNC 430 M: analog current controller for 6 or 9 axes and 1 spindle
The phase currents I1 and I2 are servo controlled. The phase current I3 is
calculated from I1 and I2. The sum of all phase current values is zero.
The actual current values for I1 and I2 are found from the motor power stage
and are provided to X51 to X59 and X61 as voltage signals.
The phase currents I1, I2 and I3 are transferred as PWM signals to the motor
power stage.
Circuit diagram:
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