ATA QB-7 series motor soft starters integrate power electronics and advanced motor control technology. They are an ideal replacement for traditional auto-transformer, star-delta and magnetic starters. With excellent soft starting performance, they are perfectly applicable to heavy-duty loads such as fans, pumps, compressors and ball mills. They effectively reduce starting impact, protect motors and mechanical equipment, and extend service life with stable and reliable operation.
Dual CPU structure with mutual redundancy for reliable operation,proprietary compact internal design for easy integration into existing systems.
The built-in bypass functionality eliminates the need for external accessories, saving costs and reducing space requirement.
Standard 485 communication, PROFIBUS communication is optional, 1 fault output (passive), 2 programmable relay output (passive), 2 programmable logic input (active), 1 programmable logic output (active), users can configure according to needs.
Expandable function（The built-in bypass mode is unavailable）: You can choose the Internet real-time monitoring module or leakage detection module extension according to your needs. (Both are optional accessories,And you can only choose one of two).
ATA QB-7 series features four starting modes: voltage start, ramp start, current-limit start, and heavy-load (kick start) start.
Dynamic fault log stores 80+ records, enabling quick troubleshooting.Automatic updating saves storage space.
Suitable for electric motor internal and external wiring mode.
Over current, motor overload, current three-phase unbalance, over/under-voltage, phase loss, overheating, under-load, PTC and thyristor short circuit and other protection functions.
The built-in communication port allows direct communication with the PC for remote control and telematics. (RS-485 interface as standard, Porfibus interface is optional).
LCD display in line with a variety of working conditions, language support Chinese and English switching, support expandable display, convenient for complete sets of cabinets.
| Voltage range | AC380V-AC1140V |
|---|---|
| Current range | 16A-1600A |
| Typical power range | Up to 800kW |
| Starting current limit | 200%-500% of rated current, adjustable |
| Starting modes | Voltage start / Ramp start / Current-limit start / Kick start |
| Stop modes | Free stop / Soft stop |
| Protection functions | Over-current, motor overload, current three-phase unbalance, over/under-voltage, phase loss, overheating, under-load, PTC and thyristor short circuit and other protection functions. |
| Communication interfaces | Standard 485 communication, PROFIBUS communication is optional |
| Operating temperature | -10 to +40 degrees C |
| Altitude | Up to 2000m standard, higher on request |
| Enclosure protection class | IP20 standard / IP54 for cabinet version |
| Certifications for this specific model | CE: CN25QSYC 001, CCC: 2024010304706152 |
| Cabinet dimensions for 7.5kW-250kW | 600*800*2200 |
| Cabinet dimensions for 320kW-800kW | 800*800*2200 |
| Equipment types this model is suitable for | Fans / Pumps / Compressors / Conveyors / Ball Mills / Crushers / Mixers / Blowers |
|---|---|
| Petrochemical | Pump starts on refinery sites |
| Steel and Metal | Starting large rolling mill drive motors |
| Mining | Compressor starts in underground environments |
Yes, QB-7 models integrate a built-in bypass contactor, reducing on-site wiring complexity and minimizing heat loss during continuous operation.
Yes, QB-7 supports heavy-duty starting with adjustable initial voltage and ramp-up time, ideal for ball mills, crushers, and other high-inertia loads.
Yes, QB-7 includes a soft stop function with adjustable ramp-down time, which effectively reduces water hammer and pipe pressure shocks in centrifugal pump systems.
Yes, QB-7 is designed for a wide input voltage range (380–1140V AC, 50/60Hz), suitable for most global low-voltage power grids.
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