Product Description:

The S7720C-NANA-PA is a digital servo drive produced by Kollmorgen within the S700 Servo Drives series. It converts three-phase mains power into a precisely regulated output that governs the torque, speed, and position of matched servo motors in automated machinery. Integrated fieldbus ports for EtherCAT and CANopen simplify networked motion control, while analog channels keep the unit compatible with existing voltage-command architectures. The drive can therefore be integrated into packaging, conveying, and positioning equipment that requires stable axis response over changing loads.

This model accepts a three-phase mains supply within a nominal window of 208 to 480 V, allowing installation on low- or medium-voltage distribution panels. Under that input, it can deliver a continuous motor current of 72 Arms, which indicates the thermal limit used when selecting conductors and overload protection. During short acceleration events, the drive outputs up to 140 Arms, supplying the extra torque needed for rapid indexing without tripping current monitors. Power entering the DC link may climb to 50 kVA, so upstream fusing and contactors must match that apparent load. Internal IGBTs switch at 8 kHz, a rate that balances motor acoustic noise with semiconductor losses while still meeting servo bandwidth demands.

The mechanical layout uses a cold-plate design that bolts directly to a cabinet heat sink, reducing forced-air requirements and helping move losses out of the control enclosure. This arrangement also leaves the front of the unit clear for electrical connections and status access inside the cabinet. Its housing carries an IP20 rating, so installation inside an enclosure is required when dust or liquid exposure is expected. For functional safety, the unit presents dual-channel STO inputs; this architecture removes energy from the motor windings without relying on external relays. Motion feedback can be trimmed through the ±10 V analog channel, where each sample is digitized at 1.25 mV resolution to reduce offset error during signal processing. With the control loops disabled, the electronics dissipate only 24 W, which is useful for cabinet thermal calculations during standby.