Product Description:

The digifas 7201-SPS is a servo amplifier manufactured by Kollmorgen for the DIGIFAS 7000 Servo Amplifiers series. It converts high-voltage DC bus energy into regulated motor phase currents, forming the power stage between a motion controller and a rotary or linear servo motor in automated equipment. The unit combines control electronics, power electronics, and ballast circuitry in one IP20-rated frame, which supports compact cabinet layouts and fast torque response in packaging, assembly, and electronic production lines. This arrangement also reduces the need for separate external braking components in many installations.

In service, the amplifier sustains a DC link of 560 V DC, and if the link exceeds 750 V, the drive issues an overvoltage trip to protect the semiconductors. A current loop bandwidth of 1 kHz lets the internal regulator settle current error within one millisecond. The stage supplies a continuous phase current of 1.5 Arms, while transient moves may draw up to 3.0 Arms. Conduction and switching losses remain at 33 W at rated current, which helps keep internal components within thermal limits during normal operation. The enclosure carries an IP20 protection class suited for ventilated control racks. Ten PLC digital leads and a Mini Combicon 3.81 mm, 12-pin, 1.5 mm² SPS connector provide discrete and serial links to higher-level controllers.

The integral ballast network manages regenerated energy and dissipates a steady 75 W while absorbing 3.2 kW pulses, engaging at 720 V and releasing at 680 V to keep the bus within safe margins. The amplifier can deliver 0.9 kVA of apparent power to the motor, and its output transistors switch at 8.33 kHz, pushing acoustic noise above most audible frequencies. Kollmorgen specifies a minimum motor inductance of 25 mH, because operating with windings below this value can overstress the current regulators. This inductance requirement is important when pairing the amplifier with small or highly responsive servo motors. Regenerative braking, switching behavior, and motor matching all need to stay within these operating limits during axis motion.