Product Description:

The S7720C-2CF2-NA is a servo drive manufactured by Kollmorgen for the S700 Servo Drives series. This unit conditions three-phase power for precision motion tasks by modulating voltage and current delivered to brushless or induction motors in automated machinery. Within an automation cell, it receives reference values from a PLC and applies them to the motor while supporting integrated safety and braking functions. It can be used on motion axes where stable speed regulation, controlled acceleration, and repeatable positioning are required throughout automatic operation. The drive also supports coordinated machine sequences in which command changes must be carried out without losing response at the motor shaft.

The drive accepts three-phase mains in a range of 208 to 480 V at 50/60 Hz. Internally, it uses a pulse-width-modulated stage that switches at 8 kHz to form a sinusoidal output waveform. Under continuous duty, the current is limited to 72 A rms, and an external 10 Ohm brake resistor can be connected when regenerated energy must be dissipated. Command information can be supplied through a differential analog channel that spans ±10 V and is digitized at 16-bit resolution. This arrangement supports accurate transfer of reference values from the control system to the power stage. Discrete status signals are provided through transistor outputs that source up to 100 mA, while thermal energy is removed through the coldplate option and a fan-controller expansion card is available when forced convection is required.

During dynamic events, the inverter can deliver 140 A rms for short intervals, yet its nominal supply demand remains 50 kVA, so the upstream power source must support that load. Up to 8 kW of braking energy may be routed to an external dissipator, while the internal circuit supplies 3 A to release a motor-mounted holding brake. This supports controlled deceleration when the driven load returns energy to the DC bus. Functional safety is addressed by the dual-channel STO circuit, which allows immediate torque removal without mechanical contactors. The unit is limited to 30 switch-on and switch-off operations per hour to reduce thermal stress on the power stage. Fan-assisted or coldplate cooling helps keep internal components within their rated temperature range during repeated motion cycles.