Cost reduction is a principle always adhered to by SNNA. Each SQ actuator is integrated with an all-in-one frequency converter. This innovative concept is far superior to the traditional actuator solution of motor + reduction gear, which simplifies the mechanical structure and reduces manufacturing and application costs.

The basic control functions of the SQ control unit include motor power supply control, overload sensor control, solid-state reversing starter with mechanical/electrical self-locking function, and a monitoring control board that monitors all signals to ensure normal operation of the actuator.

The proportional control unit precisely modulates the valve opening proportionally according to analog signals. The valve position feedback unit converts the valve opening accurately into analog signals for feedback output.

All internal and external signals can indicate normal status or faults via LED indicator lights.

Frequency Conversion & Intelligence – Absolute Safety

Main power supply monitoring

Single-phase / phase loss protection

Wrong phase sequence connection protection

Motor overheating protection

Power / torque overload protection

Open/close fault relay

Frequency Conversion Intelligent Motor Control Unit

Equipped with comprehensive motor protection functions

Automatic correction of power supply phase sequence

No need for an external motor control cabinet

Optimize the control process by regulating motor speed

Wide adjustable range for closing torque and output shaft speed→ Greatly simplifies model selection in the initial design stage

Valve Protection Functions

Soft start and soft close

Output torque never exceeds the preset upper limit

Proportional Control Board

Input Signal:4-20mADC, 0-5VDC, 0-10VDC, 1-5VDC, 1-10VDC

Input Impedance: 250Ω

Potentiometer Signal: 500Ω–10kΩ

Excitation Signal: 2.3VDC

Dead Zone Adjustment: 0.1–4.5% adjustable (0.3% step, 15 steps in total)

Inhibit Time Adjustment: 0–7.5s (0.5s step, 15 steps in total)

Regulation Accuracy: 1%

Valve Position Transmitter

Input: 110/220VAC±10%Output: 4-20mA/1-10VDCFull Scale Adjustment: ±30%Zero Point Adjustment: ±20%

Monitoring Board

Overload and overheating protection

Fault and phase sequence error detection

Phase loss or power failure monitoring