The Bypass Type Intelligent Soft Starter is an advanced solid-state motor starting and management system independently developed and manufactured in China by Yongfan Electric Co., Ltd. (YOF®). Built around a high-performance 32-bit microprocessor control core, this unit seamlessly integrates anti-parallel SCR (silicon controlled rectifier / thyristor) power drive technology, hardware and software closed-loop protection, an intuitive LCD screen, tactile keypad programming, torque ramp control, and dynamic fuzzy PID closed-loop algorithms into a high-reliability industrial starting device.
Engineered specifically to eliminate mechanical shock, water hammer transients, and line voltage dips during three-phase induction motor starting and stopping, the device delivers smooth voltage ramp soft starting, controlled soft deceleration stopping, and light-load energy saving. Full compliance with national and international standard GB14048.6-2008 (and IEC 60947-4-2) guarantees high operational stability across global industrial and commercial applications—including transmission conveyors, industrial ventilation fans, slurry machines, water pumps, crushers, and heavy air compressors.
High-speed real-time voltage and current sampling dynamically regulates thyristor conduction angles, providing smooth linear torque acceleration and eliminating mechanical transmission shock.
Upon reaching full operational speed (Ue=100%), the internal controller triggers the external AC bypass contactor (KM), completely isolating SCRs to eliminate steady-state heat generation and lower energy loss.
Clear backlit LCD display and keypad provide menu-driven parameter programming, diagnostic fault monitoring, and telemetry. RS485 communication port links directly to PC host software or DCS/SCADA networks.
Engineered for severe-duty industrial motors across mining, metallurgy, petrochemicals, water treatment, and HVAC—powering pumps, fans, ball mills, extruders, crushers, and rotary compressors.
Incorporates a programmable restart interval lockout timer. This intelligent parameter strictly prohibits immediate re-starting before thermal heat from previous operational runs dissipates, shielding motor stator windings and rotor bars from cumulative thermal breakdown caused by frequent starting cycles.
Precisely synchronizes the transfer between solid-state thyristor conduction and bypass AC contactor (KM) engagement. By ensuring that switching only occurs when the motor reaches 100% rated terminal voltage (Ue=100%) and current stabilizes, heavy inrush arcing is completely eliminated, protecting contactor points from contact burnout or welding.
All system parameters, operational metrics (real-time RMS voltage, 3-phase current, power factor), and detailed diagnostic trip codes are displayed on the backlit LCD. Enables field technicians and plant electricians to execute commissioning, parameter tuning, and troubleshooting effortlessly without specialized handheld programmers.
Equipped with isolated RS485 serial communication supporting standard industrial networking protocols. Dedicated upper PC computer software enables centralized remote start/stop control, parameter uploading/downloading, and automated real-time performance logging across factory control rooms.
Active during both the starting phase and steady-state bypass operation. Completely replaces separate external thermal overload relays and motor protectors, reducing equipment capital costs and panel assembly footprint:
Full support for custom input voltages (220V, 380V, 415V, 480V, 660V, 690V AC, 50/60 Hz), specialized enclosure ingress protection ratings (IP20 standard, IP54 custom cabinet integration), and customized firmware ramp algorithms tailored to specialized heavy industrial loads.
As an established China manufacturer and factory direct supplier, we offer comprehensive OEM / ODM services including customized silk-screen brand logos, private-label packaging, tailored firmware interface translations, and complete custom soft starter cabinet assemblies.
Manufactured under strict ISO9001 quality management systems and verified against GB14048.6-2008 and IEC 60947-4-2 standards. Flexible low MOQ starting at 1 unit for engineering prototypes, prompt lead times for volume container orders, and worldwide export sea/air freight support.
Hello, I am the online customer service
