SDU-5000 Series
Stepper Motor Driven Regulators
The SDU-5000 Series provides a practical method of controlling pressure or vacuum electronically by interfacing a stepping motor and gear box to modified 800 or 900 series regulators. Every unit includes a detailed calibration report, ensuring an open-loop accuracy of < ± 3% FS (including linearity, repeatability, and hysteresis).
System Integration
- Compatible with 4103/4104 Comparators
- Supports EVB-5000 Evaluation Boards
- Direct interface with SDB-5000 Boards
- Compact: 2.8" x 2.1" x 3.5"
Drive Performance
- 15° Bi-polar stepping motor
- 20.83:1 Gear Ratio
- Typical Step Rate: 200 steps/sec
- 100% duty cycle @ < 170 mA/coil
Regulator Performance Comparison
| Feature | SDR-800/900 | SDR-810/910 | SDR-820/920 |
|---|---|---|---|
| Type | Constant Bleed, Relieving | Non-bleed, Non-relieving | Non-bleed, Relieving |
| Repeatability | < ± 0.1 PSI | < ± 0.25 PSI | < ± 0.25 PSI |
| Sensitivity | 1" H2O | 1" H2O | 2" H2O |
| Consumption | < 150 cc/min @ 30 PSI | N/A | < 5 cc/min |
Drive Information & Methods
The SDU-5000 supports multiple drive methods, including Constant Voltage, L/R, Chopper, and Bi-Level. For high-speed applications without frequency ramps, a bi-level drive is recommended to allow pressure changes at increased power before reducing to an "idle" setting to prevent overheating.
Step Sequence Logic: Refer to the truth table to define the relationship between sequence and direction.
Ordering Information
| Part Number | Range & Porting |
|---|---|
| SDU-5000/SDR-800/[Range] | Pressure (0.7-90 PSI), 1/8" NPT Ports |
| SDU-5000/SDR-900/[Range] | Pressure (0.7-90 PSI), 10-32 Ports |
| SDU-5000/SDV-800/[Range] | Vacuum (0.7-30" Hg), 1/8" NPT Ports |
| SDU-5000/SDV-900/[Range] | Vacuum (0.7-30" Hg), 10-32 Ports |