The Harmonica is a powerful servo drive that operates in digital current, velocity,position and advanced position modes, in conjunction with a permanent-magnet synchronous brushless motor or DC brush motor. The Harmonica features flexible sinusoidal and trapezoidal commutation, with vector control. The Harmonica can operate as a stand-alone device or as part of a multi-axis network in a distributed configuration.

The Harmonica drive is set up and tuned using Elmo’s Composer software. This Windows-based application enables users to quickly and simply configure the servo
drive for optimal use with their motor.

The Harmonica power source is a 10 to 195 VDC nominal power line. A separate 24 VDC power supply serves as both the auxiliary supply and the backup supply. This allows as safe and economical "power backup" feature that is essential for positioning systems.
Two variations of the Harmonica are available: the Standard version and the Advanced version, which features advanced positioning capabilities. Both versions operate with RS-232 and/or CANopen communication.