Description
Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Pacific Scientific |
| Product Family | SCE900 |
| Model | SCE903A3-002-01 |
| Product Type | Digital Servo Drive / Servo Controller |
| Axis Configuration | Single axis |
| Main Supply | 230–400 VAC, 3-phase |
| Control Supply | 230 VAC class |
| Main Supply Frequency | 50/60 Hz |
| Rated Apparent Power | Approximately 2.5 kVA |
| Output Current | Approximately 3.75 A continuous |
| Motor Type | Brushless three-phase permanent-magnet servo motor |
| Control | Closed-loop current, velocity, and position |
| Cooling | Cooling-plate / forced-air arrangement depending on installation |
| Feedback | Motor feedback/parser interface |
| Communications | No optional communications/setup interface identified for this configuration |
| Option Configuration | Factory-assigned configuration |
| Series Status | Discontinued / legacy |
There is a specification discrepancy in secondary documentation worth flagging. One source describes the unit as a 90–264 VAC single-phase input servo drive with 5.3 A continuous output, while other documentation identifies SCE903A3-002-01 with a 230–400 VAC three-phase main supply and approximately 3.75 A / 2.5 kVA rating.
For procurement, do not use the 90–264 VAC figure as the basis for installation without checking the actual nameplate and OEM documentation for the exact unit.
Product Introduction
Pacific Scientific SCE903A3-002-01 Product Introduction
The Pacific Scientific SCE903A3-002-01 is a legacy SCE900-series single-axis digital servo drive designed for closed-loop control of brushless permanent-magnet servo motors. It handles the motor’s current, velocity, and position control functions and forms the power stage between the machine controller and servo motor.
This drive is most relevant when maintaining an existing SCE900 motion-control installation. Its discontinued status makes exact part-number matching important. The motor feedback interface, supply configuration, output rating, cooling arrangement, and factory option code should all be verified before replacement.
SCE903A3-002-01
Application Scenarios & Field Pitfalls
Engineering Pain Point
A servo axis can fail without the drive itself being defective. Encoder/parser feedback, motor power wiring, DC-bus faults, and mechanical overload can all trigger drive protection. With an obsolete SCE900 installation, replacing the controller with a visually similar drive is particularly risky because the factory option code can define important electrical and feedback characteristics.
Typical Applications
- CNC Machinery — Single-axis positioning and feed-axis motion control.
- Packaging Equipment — Precise indexing, cutting, forming, and synchronized machine movements.
- Material Handling — Servo-controlled positioning and coordinated mechanical movement.
- Industrial Automation — Single-axis brushless servo applications requiring closed-loop position and velocity control.
Technical Pitfalls to Avoid
- Verify the actual supply configuration.
Published secondary specifications for this exact part number are inconsistent. Before energizing a replacement, read the nameplate and compare the main and control supply requirements with the cabinet wiring. - Match the motor feedback system.
The SCE900 drive is intended for closed-loop servo operation. A motor with the wrong feedback device, parser arrangement, or feedback wiring can produce an immediate drive fault or uncontrolled commissioning behavior. - Do not substitute based on current rating alone.
A replacement SCE900 unit needs to match the motor, supply voltage, feedback interface, option configuration, and application requirements—not merely the approximate ampere rating. - Inspect the cooling arrangement.
The drive’s thermal performance depends on the installation and cooling method. A drive operating in a restricted cabinet with inadequate airflow can develop intermittent overtemperature faults even when electrical parameters appear normal. - Check the mechanical load before blaming the servo drive.
Excessive friction, seized bearings, an obstructed mechanism, or incorrect acceleration parameters can cause high current and repeated drive trips. Measure the mechanical system as part of the diagnosis.
Related Products
- Pacific Scientific Series — The product family to which SCE903A3-002-01 belongs. Other drives vary in power level, supply arrangement, feedback configuration, and factory options.
- Pacific Scientific SCE904AN-002-01 — Another -family servo drive. It should be evaluated by its complete ordering code rather than assumed to be interchangeable with the SCE903A3-002-01.
- Pacific Scientific SCE903A3 Series — Closely related SCE903 drive configurations. The suffix determines the specific electrical and option configuration.
- Pacific Scientific Brushless Servo Motors — The motor side of the motion-control system. Motor winding characteristics and feedback device must match the selected servo drive.
- Pacific Scientific SR-Series Servo Motors — Legacy Pacific Scientific brushless motor family commonly encountered with older motion-control equipment. Motor model and feedback type must be verified before pairing with an drive.
- Pacific Scientific 6410 Series — Another Pacific Scientific motion-control drive family, but with a different drive architecture and application range. It should not be considered a drop-in replacement.
- Pacific Scientific SC750 Series — Another legacy Pacific Scientific servo-drive family. It can be relevant during system modernization, but supply, feedback, motor compatibility, and command interface require engineering review.
- Danaher Motion / Pacific Scientific successor hardware — Later corporate product generations may provide modernization paths, but an obsolete installation should be evaluated at the system level before changing drive families.
