30 Operation principle and hardware description
Printed circuit boards
The drive contains the following printed circuit boards as standard:
• main circuit board (AINT)
• motor control and I/O board (RMIO) with a fiber-optic link to the AINT board
• input bridge control board (AINP)
• input bridge protection board (AIBP) which includes snubbers for the thyristors
and varistors
• power supply board (APOW)
• gate driver control board (AGDR)
• diagnostics and panel interface board (ADPI)
• brake chopper control board (ABRC) with option +D150
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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