Product Details
ZF-R Series Current-Controlled Motor Soft Starter
Current-Controlled Soft Start is a technology that achieves smooth motor starting by limiting the
starting current. Its core principle involves regulating the input
current of the motor through power electronic devices (such as
thyristors) to gradually increase it during the starting process
until it reaches the rated value. During startup, the current is
restricted within a preset limit to prevent excessive current
surges that could damage the power grid and equipment. Once the
motor reaches its rated speed, the soft starter automatically
replaces the thyristors (which have completed their task) with a
bypass contactor, providing the motor with the rated voltage for
normal operation.
Features and Advantages
- Low Inrush Current: By limiting the starting current, it effectively reduces the
current surge during startup, protecting the power grid and
equipment.
- Smooth Torque Rise: During the starting process, the torque increases smoothly,
protecting the transmission machinery, equipment, and personnel.
- Stepless Regulation: Current-controlled soft starters employ power semiconductor
switches to achieve stepless regulation, enabling continuous and
stable motor starting.
- Protection Functions: Equipped with multiple protection features such as overcurrent
protection, overload protection, and phase loss protection, it
enhances system reliability and safety.
Application Scenarios
Current-controlled soft starters are widely used in applications
where starting current needs to be limited, such as:
- Industrial Production: Used in automated production lines, large fans, pumps, and other
equipment to reduce mechanical and electrical shock during startup.
- Building Equipment: Such as elevators and air conditioning systems, to reduce startup
noise and extend equipment lifespan.
- Power Systems: Applied in substations and distribution lines to enhance power
system stability.
- Transportation Facilities: In motor startups for subways, light rail, and other
transportation facilities to reduce grid impact.
Technical Implementation
- Thyristor Control: Utilizes thyristor phase control technology to regulate the
motor's input voltage, achieving precise current control by
adjusting the thyristor's conduction angle.
- Intelligent Control Algorithms: Employs advanced control algorithms to freely and steplessly
adjust to the optimal starting current based on load conditions and
grid relay protection characteristics.
- Microcomputer Control and Fault Diagnosis: Conducts pre-startup fault diagnosis on the main circuit to
improve system reliability.
Advantages
- Reduces current surge during startup, protecting circuit
components.
- Lowers starting current to prevent startup overcurrent tripping.
- Can incorporate current closed-loop control to ensure smooth motor
startup.
Company Profile
GuangDong Zhufeng Electric Co.,LTD established in 2004, is a
national high-tech and energy save enterprise with approval by
National Development and Reform Commission. Focusing on the
development and production and sale of products of “energy saving
and control speed and variable speed” , Zhufeng has been a very
good supplier for energy saving and automation control solutions .
With it’s own brands: “ACI”,“ZFENG”, Zhufeng has developed DLT
series products including vector and universal variable frequency
drive, servo system, energy saving cabinet, industrial power saver,
soft starter etc. Applications including ceramic, machinery,
petrochemical, metal, textile, food, papermaking, cement, water
supply, plastic injection, central air-conditioning, smart
building,etc.