Product Description:

The digifas 7201-STEP is a servo amplifier produced by Kollmorgen within the DIGIFAS 7000 Servo Amplifiers series. Designed for installation in motion-control panels, the unit converts DC-bus energy into precisely modulated phase current for brushless servomotors that are commanded with step-and-direction signals. In automated assembly, packaging, and material-handling stations, the amplifier provides the interface between a PLC pulse train and dynamic motor torque, allowing compact axes to move with controlled speed and position accuracy.

The amplifier delivers 1.5 Arms continuously, while short bursts can reach 3.0 Arms. The DC link is maintained at 560 V, and an overvoltage shutdown engages at 750 V to prevent insulation stress. With a rated connected load of 0.9 kVA and only 33 W of power loss under that load, cabinet heat buildup is minimized. A ballast circuit can dissipate 3.2 kW of regenerated energy, preventing DC-bus rise during fast deceleration. The housing conforms to IP20 and occupies 275 × 71 × 235 mm, so ventilation slots and service clearances can be planned accurately.

The current controller bandwidth is 1 kHz, which lets the drive reproduce torque commands within a single millisecond. The output stage is clocked at 8.33 kHz, and this carrier frequency reduces audible noise while keeping switching losses moderate. Motors with inductance as low as 25 mH can be connected without excessive ripple, and the input stage presents 20 kΩ of resistance to the step interface so typical motion controllers are not heavily loaded. A dedicated brake terminal supplies 1 A for holding brakes during standstill. Position commands arrive through a Mini Combicon 3.81 mm, 12-pin, 1.5 mm² connector, and the amplifier interprets them at a resolution of 14-bit for fine incremental motion.