Product Description:

The S7720A-NANA-NA is a three-phase digital servo drive produced by Kollmorgen within the S700 Servo Drives series. The unit regulates torque, speed, and position of synchronous or induction servomotors by converting the incoming AC supply to a controlled output waveform. In automated packaging machines, pick-and-place stations, or gantry axes, the drive interfaces with higher-level motion controllers over EtherCAT or CANopen that are already integrated on its control board, providing deterministic bus communication without additional expansion cards.

At the input, the drive can accept line voltages from 208 to 480 V, drawing up to a continuous 50 kVA of apparent power when operating near its upper current limit. Under normal duty, it delivers a motor phase current of 72 Arms, while transient demands such as acceleration or reversal are handled by a peak output of 140 Arms for short intervals. Pulse-width modulation occurs at 8 kHz, balancing control bandwidth with semiconductor heating, and the current form factor of 1.01 indicates that the RMS value closely matches the average, minimizing motor copper losses. The minimum permissible motor inductance at 400 V is 0.51 mH, permitting current ripple control over a range of rotor designs.

For protective coordination, a fuse rated at 80 A is specified to clear line faults without stressing the input bridge. Dynamic braking energy is routed to an external resistor of 10 ohms, sized to absorb up to 8 kW during rapid deceleration. With the DC bus stabilized at 400 V, internal conduction and switching losses reach 1005 W, and when the power stage is disabled these losses fall to 24 W. Functional safety is provided by dual-channel STO, enabling torque-free shutdown through two independent circuits. Additional limits include a residual output voltage of 6 V, a maximum of 30 on-off cycles per hour, and noise emission that does not exceed 68 dB(A).