Modular motor controllers

DigiDrive II modular motor controllers from Anacon Systems Inc., Mountain View, Calif., operate from 115 and 230-V lines to control the speed of 0.1 to 1-hp, single-phase induction motors. The controllers use proprietary microcontrollers and software algorithms and include analog, digital, and power electronics. Applications include air handling, fan and blower control, and pumps and compressors in HVAC. The power-drive board (PDB) contains the power electronics, drive circuitry, and basic drive controls. The power interface (PINT) connects the motor and ac line to the PDB. The control interface (COIN) provides user-specific control settings and communication ports.