SC402-026 Pacific Scientific
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The Pacific Scientific SC402-026 is a servo drive in the SC400 Servo Drives series. It features a continuous output current of 3.50 A and a peak output current of 7.0 A. The drive has a maximum current loop bandwidth of 3 kHz and supports a velocity input command of ±10 V with a minimum input impedance of 50 kohms.
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Product Description:
Pacific Scientific manufactures the SC402-026 servo drive as part of the SC400 Servo Drives series. Installed in a control cabinet, the device accepts analog velocity references and generates three-phase output, allowing industrial controllers to manage brushless motor speed without requiring adjustments at the motor terminals. It operates as a stand-alone amplifier that closes the current loop internally, reducing the high-frequency regulation workload placed on the host PLC. This arrangement allows the external controller to issue motion commands while the drive regulates motor current in response to changing load conditions.
The power section delivers a continuous output current of 3.50 A, which supports compatible mid-frame motors under rated load. For rapid acceleration, the amplifier can supply up to 7.0 A of peak current for short intervals. A digitally implemented current regulator has a bandwidth of 3 kHz, permitting tight torque control before velocity feedback is processed. Pulse-width modulation operates at an output ripple frequency of 20 kHz, reducing audible switching noise and simplifying output filtering. The command circuit accepts a velocity reference of ±10 V, so the drive can connect directly to standard differential analog outputs from CNC systems or motion-control cards. Internally measured motor current is available through a monitor pin, where every ampere produces 0.63 V and the signal saturates at its full-scale value.
System diagnostics are provided through a collector output that can sink up to 25 mA while operating with a fault-line voltage of 30 VDC. When an alarm is active, the real-time motor current monitor remains available and reaches a maximum output of +4.4 VDC. This signal allows the connected control system to observe current demand while evaluating the reported fault condition. For accurate command tracking, the velocity input has a minimum impedance of 50 kΩ, preventing excessive loading of upstream analog stages. The high input impedance also helps preserve the commanded voltage as it passes from the motion controller to the servo drive.
