Operation principle and hardware description 25
Printed circuit boards
The drive contains the following printed circuit boards as standard:
• Main circuit board (RINT)
• Motor control and I/O board (RMIO)
• EMC filter board (RRFC) when EMC equipment is selected or varistor board
(RVAR) otherwise
• Control panel (CDP 312R)
Motor control
The motor control is based on the Direct Torque Control (DTC) method. Two phase
currents and DC link voltage are measured and used for the control. The third phase
current is measured for earth fault protection.
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