SCR-08 DC Motor Speed Controller AC220V 3.5A with Potentiometer
SCR-08 DC Motor Speed Controller AC220V 3.5A with Potentiometer
SCR-08 DC Motor Speed Control Module — AC220V, 3.5A, up to 500W
The SCR-08 is a precision-engineered DC motor speed control module designed for industrial and workshop applications. Running on AC220V input, it delivers smooth, stepless speed regulation via thyristor (SCR) triggering and voltage negative feedback — giving you reliable, stable motor performance across a wide range of loads. Whether you're running bag-making machinery, wire drawing equipment, food production lines, or printing and packaging systems, this compact module handles it all.
Compatible with permanent magnet, separately excited, and field-excited DC motors, the SCR-08 supplies regulated DC power directly to the motor armature for true constant-torque stepless speed control. A built-in soft-start function eliminates excessive inrush current at startup, protecting both the module and your motor.
Made in Mainland China.
Key Features
- Stepless Speed Regulation — Thyristor trigger control allows infinitely variable speed adjustment from 0 to full speed.
- Voltage Negative Feedback — Keeps motor speed stable under varying load conditions, with a 5% static accuracy rating.
- Overcurrent Cutoff Protection — Built-in current cutoff feedback circuit safeguards the motor and module against overload.
- Soft Start — Limits startup inrush current, extending the life of the motor and connected machinery.
- Displacement Controller Compatible — Supports automatic stepless speed regulation via external displacement controller.
- Remote Control Ready — Compatible with NPN or PNP photoelectric switches for remote speed control.
- Simple Terminal Connection — Screw-terminal wiring makes installation straightforward, even in demanding industrial environments.
Specifications
| Input Voltage | AC 220V, 50/60Hz |
| Output Current | 3.5A |
| Suitable Motor Power | 50W – 500W |
| Armature Output Voltage | DC 0–220V |
| Excitation Output Voltage | DC 200V / 1A |
| Static Accuracy | 5% |
| Circuit Topology | Single-phase bridge half-control with negative voltage feedback |
| Trigger Method | Single-junction transistor (UJT) |
| Connection Type | Terminal (screw terminal) |
| Dimensions | 146 × 100 × 40 mm |
Operating Environment
- Ambient temperature: -10°C to +40°C
- Relative humidity: ≤85% (non-condensing), with good ventilation
- Not suitable for explosive atmospheres or environments with conductive metal dust
Package Contents
- 1× SCR-08 Motor Speed Control Module
- 1× Potentiometer
Safety & Electrical Standards
When installing and wiring motor control modules, always follow applicable electrical safety guidelines. For general electrical safety best practices in industrial settings, refer to OSHA Electrical Safety Standards.
Frequently Asked Questions
Q: What types of DC motors are compatible with the SCR-08 speed control module?
A: The SCR-08 is compatible with permanent magnet DC motors, separately excited DC motors, and field-excited (excitation) DC motors rated between 50W and 500W. It regulates speed by controlling the armature voltage from DC 0V to DC 220V, enabling smooth, constant-torque stepless speed control.
Q: Can the SCR-08 be used with an external controller or automated system?
A: Yes. The SCR-08 supports external displacement controllers for automatic stepless speed adjustment, and is also compatible with NPN or PNP photoelectric switches for remote speed control integration — making it suitable for automated production lines and machinery.
Q: How does the soft-start feature protect my motor?
A: The built-in soft-start circuit gradually ramps up the voltage supplied to the motor armature at startup, limiting inrush current that would otherwise stress the motor windings and connected components. This extends equipment service life and reduces wear on downstream machinery.
Q: What is the input voltage requirement for the SCR-08?
A: The SCR-08 requires a single-phase AC 220V, 50/60Hz power supply. It is not designed for 110V systems without an appropriate step-up transformer. Always verify your local mains voltage before installation.