Product Description:

The GADSA03LB22 is an AC servo amplifier produced by Sanyo Denki within the G Sanmotion AC Servo Amplifiers series. As a power stage for permanent-magnet synchronous servomotors, it receives analog or pulse command references from a motion controller and modulates three-phase output using insulated-gate bipolar transistor switching. In industrial automation, it closes the torque, velocity, or position loop between the drive and a matched Sanmotion G motor. The unit conditions feedback, manages regeneration, and supervises safety inputs while occupying minimal panel space.

It draws three-phase mains current at 6.9/7.0 Arms, and the power section is rated for 2.4 kVA, providing headroom for acceleration transients. Output to the motor reaches a steady 5.2 Arms and can surge to 16.3 Arms during rapid torque commands. Inside the amplifier, an IGBT sinusoidal PWM control system shapes the current waveform, while the logic section requires only 0.3 Arms from the control circuit. Command references are accepted as analog ±10 V signals or differential pulse trains, and two sourcing GPO channels provide status signals to peripheral devices. When the motor demands its maximum 1.5 kW mechanical output, the amplifier maintains current regulation without exceeding its thermal limits.

The thermal design is supported by a 30 A amplifier capacity and a regenerative circuit capable of dissipating 60 W through an external resistor. The drive connects to a 10 Ω regeneration resistor mounted on a panel rail, preventing DC-bus overvoltage during deceleration. Motion bandwidth benefits from a 1:5000 velocity control range, and stable tuning is possible even when the load reflects up to 10 times the rotor inertia. The safe torque-off input is wired without a delay circuit, so motor torque is disabled immediately when the controller issues a stop. The external resistor remains accessible without opening the amplifier housing.