Products Overview
The JJR8800 series AC soft start device adopts a wall-mounted metal enclosure with a powder-coated finish, presenting a refined and professional aesthetic. It is engineered for the reliable and efficient starting of small to medium-sized industrial motors, particularly in applications involving fans, pumps, and general machinery.
Products Advantages
Compact & Integrated Design
Features a built-in bypass contactor, eliminating the need for external components, saving cabinet space, and simplifying installation through its front-access, slide-cover terminal design.
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Intelligent & Flexible Control
Offers two primary starting modes (voltage ramp and current-limited) alongside programmable settings. Its closed-loop control, based on motor feedback voltage, ensures successful starts across varying loads and grid conditions.
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Comprehensive Protection Suite
Provides extensive safeguards including overcurrent, overvoltage, phase loss, ground fault, and motor underload protection, alongside dedicated pump functions like anti-dry-run.
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Enhanced Connectivity
Comes with built-in Modbus RTU communication, with optional modules (PROFIBUS DP, PROFINET, Modbus TCP/IP) for seamless integration into industrial automation networks.
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Technical Specifications
| Category | Parameter |
|---|---|
| Main Circuit | Voltage: AC400V (-15% ~ +10%); Current: 45A ~ 960A; Frequency: 50Hz/60Hz (±2%) |
| Control Power | AC220V ±15% |
| Adjustable Times | Start: 1.0 ~ 60.0 s; Stop: 1.0 ~ 60.0 s; Kick Start: 0.1 ~ 20.0 s |
| Control Ranges | Initial Voltage: 15% ~ 80%; Current Limit: 1.0 ~ 8.0 x Ie; Kick Start Voltage: 20% ~ 100% |
| Cooling / Communication | Natural + Fan Cooling / RS485 (Modbus RTU), Optional Fieldbus Modules |
For more product details, please feel free to contact us.
Working Principle
At the heart of the JJR8800 AC soft start device is a DSP microprocessor that controls Silicon Controlled Rectifiers (SCRs). By precisely managing the SCRs' conduction phase, it regulates the voltage and current supplied to the motor during startup. This results in a smooth, controlled acceleration that limits inrush current, reduces mechanical stress on both the motor and driven equipment, and minimizes disturbance to the power grid.
Application-Specific Value for Pump Systems
The JJR8800 delivers targeted benefits in pump control, addressing common operational challenges:
Mitigate Water Hammer: The soft-stop function gradually reduces pump speed, effectively minimizing destructive pressure surges (water hammer) in pipelines during shutdown, thereby protecting valves and pipes.
Prevent Clogging & Clean Pipelines: The programmable "kick start" function can briefly reverse or jolt the pump to dislodge debris, helping to clear minor clogs and maintain flow efficiency.
Avoid Dry-Running: The adjustable underload protection feature monitors motor current. If a low-load condition indicative of dry-running is detected, it trips to protect the pump from damage.
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