We are offering top quality of variable frequency converters dedicated to drive applications. For mains voltage difference they are divided into two groups: AFC type with 230V AC mains and MFC-type with 3x400V 50Hz AC mains. AFC series contains devices with power rating up to 3kW, MFC311 series - up to 15kW and MFC310 - from 18,5kW up to 315kW. Recently introduced vector (sensorless) controlled frequency converters was named MFC710.
Drive sets and power distribution units:
Wide offer of drive sets (AC and DC) in the form of steel cases. In control system - according to customer needs - standard elements are used, as well as industrial controllers (PLC).
Notes: For detailed user manual,pls do feel free to contact us!
Worked out vector frequency converters are based on previous, standard-line devices. In proposed new vector inverters innovative control method was used (DTC - Direct Torque Control) to direct control of motor generated torque. This method makes possible to accurately control of motor torque (also for zero velocity conditions with stopped motor shaft) and maintain declared drive parameters also without an speed/position (encoder) installed. For the sake of using innovative control methods use of mechanical speed/position sensor isn't necessary.
Proposed frequency converters are totally domestic products. These are competitive products for worlds potentates as ABB, Vacon, Siemens, Danfoss, Eurotherm Drives etc. Proposed electrical drives (frequency converters) don't have functional equivalents on national market in proposed power range.
Product Specification / Models
Sensorless vector frequency converter MFC710 type 1.1-315kw
DTC-SVM technology (Direct Torque Control - Space Vector Modulator) with perfert performance
* Three-phase supply3*400v 50/60 Hz
* Output0-400 Hz,3*400v
* Rated output power 15-315kwt
* Advance control modes:
Vector mode (sensor or sensorless)
-tRemovable operating panel with LCD alphanumeric display
-tIntegrated Logic Controller (PLC)
-tBuilt-in pump or fan set controller
-tIntegrated PID controller
-tEmbedded communication module RS232/RS485 (Modbus)
-tProgrammable fixed frequencies
-tDigital potentiometer function
-tDirect rotational (or linear) incremental encoder (5V line interface)
-tElimination of resonance frequencies bands
-tDefinable shapes and slopes of selected frequency characteristic (linear, "S"-shaped)
-tAllowable work with torque control
-tAutomatic identification of motor parameters
-tProgrammable control structure:
- two customizable control variants (A & B):
- speed selector block (control panel, analog input, PID controller, digital potentiometer, function block),
- torque selector block(analog inputs, function block),
- run and direction control (control panel, digital input, function block),
- programmable digital inputs: run, direction, run blockade, external trip, trip cancellation,
- programmable digital outputs (3 relays and 1 open collector type): ready, run, fault, warning, overtemperature of heatsink, given speed reaching, threshold speed reaching, current limit, function block),
- programmable analog outputs: frequency, rotational speed, output current, voltage, loading of motor, function block.
-tTotal work counter (hours)
-tDiagnostic and blockade system
-tControl panel protection with system of passwords
-tEmbedded RFI filter (for up to 15kW)
-tMemory for 4 motors parameters
-tAllowable use of default values for all parameters
Application / Models
Knitting Machine, compressor, extruding machine, injection machine, motor, braiding machine, pressure fan, forced draught blower, blower, blowing machine, blow molding machine, root's blower, film blowing machine, cutter bar, cut-off machine, slitter, Cutting machine, conveyor, pump, grinder, cluster, glazing machine, polisher, polishing machine, laundry-drier, drying machine, ball crusher, ball grinding mill, drawing machine
Shandong TWERD Electrical Co.,Ltd.is located in Weihai, a beautiful coastal city in Shandong province. Advanced technologies have been introduced from the company of TWERD Power Electronics and Warsaw University of Technology.
Our frequency converters can compete with many products available on the market in terms of functionality and reliability. They were presented in 1999 at VIII International Mielec-town Fair and awarded as “the most innovative product of the fair”.
Recently introduced new series of vectorial MFC-710 frequency converters was honored by Prof. Robert Szewalski Grand Prix at TECHNICON 2005 Fair of Science and Technology in Gdansk
From the moment of its establishment company has been carrying on research and development work, initially independently, then together with Technical Universities from Gdansk, Warsaw and Lviv. In cooperation with the Institute of Control and Industrial Electronics (Warsaw University of Technology) we designed vector control of frequency converter with high generated torque at low speed. Applied DTC-SVM method (Direct Torque Control - Space Vector Modulator) provides good dynamic response of drive.
Our products are of complete function, high reliability and easy operation. Several properties are of A level according to the inspection of CECDE. Our products were awarded bronze metal at the 2007 international technology innovation trade fair in Belgium, silver metal at the second international Warsaw invention conference in Warsaw. Our company has been approved by GOST-R compulsory certification and Certification of ISO9000 Quality Management System. The products have been exported to Poland, Russia and other countries.We welcome friends from various circles at home and abroad to sincerely cooperate for a better future.