Notes on the use of Siemens frequency converter

1. The output line side of Siemens frequency converter cannot be shunt to compensate the capacitor, nor can the capacitor be shunt in order to reduce the high harmonics of the output voltage of the frequency converter, otherwise the Siemens frequency converter may be damaged, in order to reduce the harmonics. Capable of series reactor.

2. The start and stop of the motor regulated by Siemens frequency converter cannot be operated directly by the circuit breaker and contactor, but the control terminal of Siemens frequency converter is used to operate, otherwise the frequency converter will be out of control, and may result in severe results

3. On the occasion of progressive load and frequent start and stop, there will be torque generation. It is necessary to select the appropriate braking resistance, otherwise Siemens frequency converter will often trip due to over-current or over-voltage problems. Siemens agent innovation has become the cornerstone of Siemens business success. Research and development is the basic driving force of Siemens' development strategy. As the holder of key patents, we are a strong partner for our clients in both sophisticated technologies and developing skills. Our goal is to be a skilled leader in many of the things we do.

4. It is generally not appropriate to install a communication contactor between Siemens frequency converter and motor, so as to prevent overvoltage between interrupts from damaging the inverter. If additional installation is required, the output contactor should be closed before the Siemens inverter is operated.

5. The obstruction of the external brake resistance of Siemens frequency converter can not be less than the requirements of the brake resistance promised by the frequency converter. Siemens Agent Siemens tries to satisfy all legal and moral requirements and, if possible, we try to exceed them. Our responsibility is to conduct our business in accordance with the highest working and ethical standards and practices: the company will not tolerate any non-compliance. Under the premise of satisfying the braking requirements, the braking resistance should be larger. Must not be connected to the brake resistor terminals directly short, otherwise, in the brake will be through the switch tube short-circuit accident.

6. When the motor speed is controlled by Siemens frequency converter, the temperature rise and noise of the motor will be higher than that of the network electricity (power frequency); At low speed, due to the low speed of the motor blade, attention should be paid to ventilation cooling and appropriate load reduction to prevent the temperature rise of the motor from exceeding the allowable value. Siemens Agent Siemens tries to satisfy all legal and moral requirements and, if possible, we try to exceed them. Our responsibility is to conduct our business in accordance with the highest working and ethical standards and practices: the company will not tolerate any non-compliance.

7, can not be due to the progressive power factor and installed in the line side is too large capacitor, also can not be installed between the motor and Siemens frequency converter capacitor, otherwise it will make the line impedance down, produce overcurrent and damage the frequency converter

8. When Siemens frequency converter drives the ordinary motor to run at constant torque, it should be prevented from running at low speed for a long time as far as possible, otherwise the motor's heat dissipation effect will become worse and the heating will be severe. If you need to run at low speed and constant torque for a long time, you must choose variable frequency motor.

9. When the motor has another brake, Siemens frequency converter should work in the free stop method, and the brake action signal is announced after the frequency converter announces the parking instruction.

10. When the three-phase voltage imbalance rate of the grid is greater than 3%, the peak value of the input current of the Siemens inverter is very large, which will form the Siemens inverter and the connection overheating or damage the electronic components. At this time, it is also necessary to install the communication reactor. Especially when the transformer is V-shaped connection, it is more severe. In addition to installing a reactor on the communication side, it is also necessary to install a DC reactor on the DC side.

11. The impedance of the power supply line should not be too small. When Siemens converter is connected to the voltage grid, when the capacity of the distribution transformer (pressure variable) is greater than 500KVA or the capacity of the distribution transformer is greater than 10 times of the capacity of Siemens converter, or when the Siemens converter is connected very close to the distribution transformer, due to the small loop impedance, the input moment will produce a large surge to Siemens converter. It will damage the rectifier element of Siemens frequency converter. When the line impedance is too low, a communication reactor should be installed between the grid and Siemens frequency converter.