General  Introduction

• No need of extra output filtering device

• Directly driving the general medium voltage 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,  medium voltage variable frequency drive has the following functions :

• 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-high variable frequency drive, it can realize No-step speed regulation, which makes the typical motors into intelligent motors.

 Medium voltage variable frequency drive has the following  features:

• High quality power input: By phase shifting of the secondary winding and multi-pulse diode rectifier, isolated powers can be acquired and supplied for power cells. (18 pulses for 3/3.3kV, 30/36 pulses for 6/6.6kV, 48/54 pulses for 10/11kV) 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 RS485 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.

Specification