Product Description:

The SC402-001-T4 is a servo drive manufactured by Pacific Scientific within the SC400 Servo Drives series. It regulates torque and speed for brushless or brushed servomotors in industrial automation cells, linking motion axes to PLC-based control schemes through analog command inputs. By converting single- or two-phase mains power to a regulated DC bus, the unit supplies the closed-loop current demanded by high-bandwidth positioning tasks while also delivering diagnostic signals used by supervisory controllers.

The power front end accepts an input of 115/230 VAC and rectifies it into separate bus levels of 160 VDC when the lower line is used and 320 VDC on the higher line, giving designers two operating envelopes without hardware changes. A main input fuse rated 20 A at 250 V protects the rectifier, while a 0.5 A, 250 V control-supply fuse isolates the logic section. Current regulation operates with a maximum bandwidth of 3 kHz, and the switching stage imposes an output-ripple carrier near 20 kHz, keeping ripple outside most motor velocity loops. The drive interprets a ±10 V velocity input and a 4.2 V full-scale current command, then reports actual phase current on a 0.63 V/A scale with a 4.4 V full-scale limit. A fault transistor sinks 25 mA at 30 VDC so external alarms can follow drive status.

During acceleration or load transients, the amplifier can deliver a peak phase current of 7.0 A, corresponding to burst mechanical outputs of 1000 W from a 115 V line or 2000 W from a 230 V source. The internal analog tachometer input is calibrated for a gradient of 4.0 V/Krpm, allowing straightforward speed feedback scaling. Continuous operation is monitored by the current loop and by the fault output so external controllers can remove the enable line when fuse trips, over-temperature, or bus under-voltage conditions arise.