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Wanlida Medium voltage frequency inverter

Energy Saving Fields

• Power Generation: Induced draft fan, forced draft fan, condensate pump, feed pump, primary air fan, secondary air fan, booster fan, circulating pump, mill fan, slurry pump etc
• Cement: draft fan, high-temperature fan, air blower, dust collection fan, grinding machine etc.
• Metallurgy: blast furnace blower, slurry pump, feed water pump, dust fan, compressor etc.
• Petroleum&Chemical: Water injection pump, crude oil pump, Compressor, fan, circulation pump, etc
• Urban water supply: Water delivery pump, water intake pump, water supply pump, sewage treatment industry, self-fractionating pump etc
• Minerals & Mining: Mud pump, ventilation fan, belt conveyor, slurry pump etc
  Others: Loads such as fan, pump and compressor in pharmaceutical, paper making and wind tunnel test.

Especially for: Fan and Pump

Product Structure

Wanlida Series  Medium voltage frequency inverterconsists of By-pass cabinet,Transformercabinet, power unit cabinetand controller cabinet from left to right.

Technical advantages

• No need of extra output filtering device
• Directly driving the generalmediumvoltage synchronous or asynchronous motor and the temperature of the motor will not be increased.
• No need of motor derating operation
• No dv/dt damage to insulation of motor and cable
• No torque ripple induced by harmonics, and the service life of motors and mechanism devices can be extended
• No cable length limited when voltage drop is in the allowable range.

Besides the above advantages, Wanlida  Medium voltage frequency inverterhas the followingfunctions and features:

• Protection of overload, overheat, over-current, open-phase, grounding, over-voltage, negative sequence.
• Current limited function
• Interlock protection of control power supply
• Two sets of control power hot standby for redundancy
• Power cell by-pass function
• Control cabinet automatic bypass function
• Cabinet door opening alarm function
• Lock-phase function
• Synchronizing switch function between variable frequency and power frequency (optional)
• Soft start of motors, no impact to mechanical equipment and network
• Voltage source High-highvariablefrequencydrive, it can realize No-step speed regulation, which makes the typical motors into intelligent motors.
• Highqualitypowerinput:By phase shifting of the secondary winding and multi-pulse diode rectifier, isolated powers can be acquired and supplied for power cells. (*8 pulses for 3/3.3kV,*0/*6 pulses for 6/6.6kV, *8/*4 pulses for *0/*1kV) By using the technique of multi-pulse rectifier, the harmonic current could be eliminated greatly.
• Power cell communicate with controller through optic-fiber, completely electric isolated
• Inner set PID regulator, can realize running in closed-loop
• Multiple communication methods with host computer, isolated RS**5 interface, standard MODBUS RTU, communication protocol, PROFIBUS DP (optional), industrial Ethernet communication protocol (optional)
• Accurately fault records, can inquiry information and locate fault
• Compact construction, reasonable layout (can do customer-design)
• Very good protective design to dust, ferrum pulveratum, acid mist, moisture etc.
• Bypass cabinethas a function of "five-protection", meanwhile, it has a pressure relief channel to ensure the safety of operators.
• Modularized design of power units, interchangeable and easy to produce and repair.