product description

The AC squirrel-cage motor soft starting technology has been used in developed countries for many years, and has successfully solved the problems of the large starting current caused by the AC motor, the influence on the quality of the power supply voltage, the increase in the loss of the power supply line, and the impact on the mechanical equipment.

CHRHR soft starter is based on advanced microprocessor as the core, applies advanced software design method and hardware technology, adopts thyristor phase shift technology, realizes the soft start and soft stop functions of AC asynchronous motor, and has the functions of phase failure and overvoltage at the same time. , undervoltage, overcurrent, overload, three-phase unbalance, short circuit and many other protection functions.

The soft starter covers 15-800KW, with reliable quality and good electromagnetic compatibility (EMC), suitable for underground coal mines, open-pit coal mines, metallurgical mines, ports and terminals, coal preparation plants, power plants, fans, pumps, conveying and compressors It is an ideal replacement product for step-down starting equipment such as star/delta conversion, auto-coupling step-down, and magnetron step-down.

Typical Application

▪Water pump——Using the pump control function, when starting and stopping, the phenomenon of pump flow water hammer caused by the impact of liquid flow is reduced, which saves system maintenance costs

▪Ball mill - start with double ramp voltage, reduce the wear of gear torque and reduce maintenance workload, which saves time and money

▪Fan - use a soft starter to replace the old traditional starter, reduce belt wear and mechanical shock, and save maintenance costs

▪Compressor - using current limiting or dual ramp start, to achieve smooth start, reduce motor heating and prolong service life

▪Crushers - use locked rotor and fast protection to avoid motor overheating and burning due to mechanical failure or blockage

▪Conveying machinery - use soft start and preset low speed operation to achieve a smooth, gradual start process to avoid product displacement and liquid spillage

Features

1. Three starting methods: voltage ramp starting method can obtain the maximum output torque, constant current soft starting method can obtain the maximum limited starting current, and heavy-load starting method can output the maximum starting torque

2. Stop mode: voltage ramp soft stop, free stop

3. Programmable delay start mode, programmable interlock control, programmable fault contact output

4. No phase sequence requirement for input power

5. The starting time and stopping time can be programmed to modify

6. Has a variety of protection functions: overcurrent, three-phase current unbalance, overheating, phase loss, motor overload, etc.

7. Dynamic fault memory function, easy to find the cause of the fault

8. The three-phase maximum starting current and maximum running current can be searched online

9. Chinese character display function: LCD liquid crystal screen displays various working conditions parameters, with text prompts in programming and fault states

Use environment

▪Applicable standard: GB14048.6-2008 (IEC947-4-2)

▪Applicable motor: squirrel cage three-phase asynchronous motor

▪Rated voltage: AC three-phase symmetrical power supply 380V±15%, 660V±15%, 1140V±15% Frequency: 50Hz±2%

▪Anti-seismic capability: below 3000 meters above sea level, and below 0.5G for vibration force device

▪Starting times: frequent or infrequent starting can be done, recommended starting times ≤ 10 times/hour

▪Cooling method: natural cooling (Z6 forced air cooling) Shock resistance: 15g 11ms Protection class: IP20

▪Working height: The altitude of the installation site is not more than 1000 meters, and the current is reduced by 0.5% for every 100 meters.

▪Operating temperature: 5℃～55℃, the current decreases by 1.2% for every 10℃ increase

▪Relative Humidity: Maximum 90% when the temperature is 20℃

Working Principle

The block diagram of the CHRHR soft starter is shown in Figure 2. The power part is composed of three pairs of anti-parallel thyristors as shown in Figure 1. The core microprocessor of the control part collects the synchronization signal, voltage signal, current signal and motor power factor angle of the grid. The control software changes according to these four parameters. , the application of thyristor phase shift technology, so that the voltage added to the motor slowly reaches the full voltage according to a certain law. By properly setting the control parameters, the torque and current of the motor can be better matched with the load requirements.

Circuit Connection

CHRHR-Z22 series soft start dimensions and installation dimensions