Sr Liquid Resistance PLC Rotor Starter
|FOB Price:||US $38,770-46,155 / Piece|
|Min. Order:||1 Piece|
|Min. Order||FOB Price|
|1 Piece||US $38,770-46,155/ Piece|
|Production Capacity:||1000 Sets Per Year|
|Transport Package:||Wooden Case|
|Payment Terms:||L/C, T/T, Money Gram, Western Union|
- Model NO.: Sr
- Output Type: Triple
- Switch Mode: High Carrier Frequency PWM Control
- Voltage of Power Supply: Medium Voltage Variable-Frequency Drive
- Nature of DC Power: Voltage Variable-Frequency Drive
- Applicable Motor Power: <6000 Kw
- Specification: CE, ISO9001
- HS Code: 85141090
- Application: Three Phase Transducer, High Frequency Converter Transducer
- Principle of Work: PLC Control
- Main Circuit Type: Voltage
- Link of Transformation: AC-AC Variable-Frequency Drive
- Brand: Big Pawer
- Trademark: Big pawer
- Origin: Xiangyang, Hubei Province, China
SR Series rotor starters (hereinafter referred to as starters) are the new kind of starting devices developed for improving the starting feature of large- and medium sized wire-wound AC asynchronous motors. Having solved the problems of ordinary liquid resistor starters which are not continuous or frequent start, on the work of environmental requirements, add water frequently, large quantity of maintenance, the starters of this series are suitable for the heavy-load starting of the motors of ball grinding mills, air compressors, crushers, large-sized blast fans and large-sized pumps which are used in the industrial branches of building materials, metallurgy, chemical industry, mining.
2 Standard & criterion
GB4720-1984 electric control devices part I low-voltage electric control devices
GB4942.2-1993 low-voltage electric devices shell protection grade
GB/T5226.1-1996 industrial mechanical electric devices part I general technical condition
GB/T13384-2008 mechanical electric products casing general technical condition
GB14048.4-2003 low-voltage switch devices and control devices
low-voltage mechanical electric contactors and motor starters
3 Working condition
Upper limit of ambient temperature is no more than +55ºC, and lower limit is no less than -5ºC.
The relative humidity is no more than 85 percent. The height above sea level is no more than 3000m.
It should be placed on an indoor place without obvious shake and impact, without fire and explosive dangers and the vertical gradient is no more than 5º.
There must be no conductive dust and corrosive gas.
4 Type explanation
4.1 Significance of auxiliary function code:
B Equipped with vacuum circuit breaker
4.2 See table 1 for suitable motor capacity
Note: 1)The rotor starter for the motor with even large capacity will be designed and manufactured according to the requirements of customers.
2) Different types of the load, the load moment of inertia has the very big differerce, the starting time and temperature rise is a differert.
3) The starting times has relation with envirnoment temperature and load types. The starting times = (the alarm temperature – the initial temperature)/the starting temperature rise.
5.1 Fundamental Principle
Allow the relative distance between the two parallel plates in the conductive liquid to decrease progressively up to zero through a mechanical driving device and make the resistance value run into the return circuit of motor rotor decrease continuously, so as to realize the heavy-load smooth starting of large- and medium-sized wire-wound motors.
5.2 Technical characteristics
5.2.1 The starting current is low but constant without impact on power network; the starting current is no more than 1.3 times the rated current. Therefore the requirements of the heavy-load starting of motor for transformer capacity can be decreased, reducing lump sum investment.
5.2.2 It is smooth in starting, so as to lower its impact on the mechanical equipment, and the service life of the mechanical equipment and motor can be prolonged.
5.2.3 Fully enclosed structure, strong ability to adapt to the environment, maintenance free, convenient and reliable use, long service life.
5.2.4 Full metal body, fast heat dissipation, heat capacity, continuous starting times no limit.
5.2.5 Using PLC and touch screen control, pole position, depth of liquid level, temperature and other key parameters all have visual display, more convenient use and maintenance.
5.2.6 With the function of automatic water replenishment, without artificial replenishment, reduce maintenance.
5.2.7 With stirring function, to ensure that every time starting performance.