1. No-load current test of Mitsubishi inverter
1. Ground the ground terminal of the Mitsubishi inverter.
2 Connect the power input terminal of Mitsubishi inverter to the power supply through the leakage protection switch.
3 Check if the factory display of Mitsubishi inverter display window is normal. If it is not correct, it should be reset, otherwise it needs to be returned.
4 Familiarize yourself with the operating keys of the inverter. The general inverter has six keys: RUN, STOP, PROG, DATAPENTER, UP (UP), DOWN, DOWN, and other inverters. The definition of the keys is basically the same. In addition, some inverters also have function keys such as MONITORPDISPLAY, RESET, JOG, and SHIFT.
Second, Mitsubishi inverter with motor no-load operation
1. Set the power and number of the servo motor, and consider the operating current of the inverter.
2. Set the maximum output frequency, fundamental frequency and set torque characteristics of Mitsubishi inverter. The general-purpose inverters are equipped with multiple VPf curves for the user to select. The user should select the appropriate VPf curve according to the nature of the load. In the case of fan and pump loads, set the torque running code of the frequency converter to variable torque and torque reduction operating characteristics. In order to improve the low-speed performance of the inverter when starting, the torque output from the motor can meet the requirements of the production load start-up, and the starting torque should be adjusted. In the asynchronous motor variable frequency speed control system, the torque control is more complicated. In the low frequency band, since the influence of resistance and leakage reactance cannot be ignored, if the VPf is kept constant, the magnetic flux will decrease, thereby reducing the output torque of the motor. For this reason, the voltage is appropriately compensated at the low frequency band to increase the torque. Generally, the inverter is manually compensated by the user.
3. Set the Mitsubishi inverter to its own keyboard operation mode, press the run key and stop key to observe whether the motor can start and stop normally.
4. Familiar with the protection code when the operation of Mitsubishi inverter is faulty, observe the factory value of the thermal protection relay, observe the setting value of the overload protection, and modify it if necessary. The user of Mitsubishi inverter can set the electronic thermal relay function of Mitsubishi inverter according to the instruction manual of Mitsubishi inverter. When the output current of Mitsubishi inverter exceeds its allowable current, the overcurrent protection of Mitsubishi inverter will cut off the output of the inverter. Therefore, the maximum threshold of the Mitsubishi Inverter Electronic Thermal Relay does not exceed the maximum allowable output current of the inverter.
Third, Mitsubishi inverter with load test run
1. Manually operate the operation stop button of the Mitsubishi inverter panel, observe the motor running stop process and the display window of the inverter to see if there is any abnormality.
2. If the overcurrent protection action occurs in the Mitsubishi inverter during the start of the P stop motor, the acceleration P deceleration time should be reset. The acceleration of the motor during acceleration and deceleration depends on the acceleration torque, and the frequency change rate of the Mitsubishi inverter during start and brake is set by the user. If the motor's moment of inertia or motor load changes, when the speed is increased or decelerated according to the preset frequency change rate, there may be insufficient acceleration torque, which may cause the motor to stall, that is, the motor speed is not coordinated with the output frequency of Mitsubishi inverter, resulting in Over current or over voltage. Therefore, it is necessary to set the acceleration and deceleration time according to the motor inertia and load, so that the frequency change rate of Mitsubishi inverter can be coordinated with the motor speed change rate. The reason for checking whether this setting is reasonable is to first select the acceleration and deceleration time according to experience, and if there is overcurrent during the starting process, the acceleration time can be extended appropriately; if overcurrent occurs during braking, Prolong the deceleration time appropriately. On the other hand, the acceleration and deceleration time should not be set too long. If the time is too long, it will affect the production efficiency, especially when it is frequently started and braked.
3. If the Mitsubishi inverter is still protected within a limited time, the running curve of the start P stop should be changed from straight to S-shaped, U-shaped or S-shaped, anti-U-shaped. When the motor load inertia is large, a longer start-stop time should be used and the run curve type should be set according to its load characteristics.
4. If the Mitsubishi inverter still has an operation fault, try to increase the protection value of the maximum current, but you cannot cancel the protection. You should leave at least 10 to 20 protection margin. Imported pump valve
5. If the operation of Mitsubishi inverter is still faulty, replace the inverter with a larger power.
6. If the Mitsubishi inverter drives the motor to reach the preset speed during the start-up process, there may be two cases:
(1) Electromechanical resonance occurs in the system and can be judged from the sound of the motor running.
By setting the frequency jump value, you can avoid the resonance point. Generally, the inverter can set three-level jump point. When the VPf-controlled Mitsubishi inverter drives the asynchronous motor, the current and speed of the motor will oscillate in some frequency bands. In severe cases, the system will not run. Even during the acceleration process, overcurrent protection will cause the motor to fail to start normally. It is more serious when the load or moment of inertia is small. The common inverters are equipped with a frequency jump function. The user can set the jump point and the jump width on the VPf curve according to the frequency point at which the system oscillates. These frequency segments can be automatically skipped when the motor accelerates to ensure that the system can operate normally.
(2) The torque output capability of the motor is not enough. The factory parameters of different brands of inverters are different. Under the same conditions, the load capacity is different, and the load capacity of the motor may be different due to different control methods of the inverter; or Due to the different output efficiencies of the system, the load capacity will vary. In this case, the value of the torque boost amount can be increased. If it is not available, the manual torque boost function can be used. Do not set too large, and the temperature rise of the motor will increase. If it still does not work, the new control method should be used. For example, Hitachi inverter adopts the method of constant VPf ratio. When the startup fails to meet the requirements, it uses the speed sensorless space vector control method, which has greater torque output capability. For fan and pump loads, the curve for the torque reduction should be reduced.
4. Mitsubishi inverter is connected with the host computer for system debugging. After the manual basic setting is completed, if there is a host computer in the system, the control line of Mitsubishi inverter is directly connected with the upper machine control line, and the operation of Mitsubishi inverter is completed. The mode is changed to terminal control. According to the needs of the host computer system, set the range of the receiving frequency signal terminal of Mitsubishi inverter to 0~5V or 0~10V, and the response speed of the Mitsubishi inverter to sample the analog frequency signal. If an additional monitoring head is required, select the monitoring amount of the analog output and adjust the range of the Mitsubishi inverter output monitoring terminal.
1. Ground the ground terminal of the Mitsubishi inverter.
2 Connect the power input terminal of Mitsubishi inverter to the power supply through the leakage protection switch.
3 Check if the factory display of Mitsubishi inverter display window is normal. If it is not correct, it should be reset, otherwise it needs to be returned.
4 Familiarize yourself with the operating keys of the inverter. The general inverter has six keys: RUN, STOP, PROG, DATAPENTER, UP (UP), DOWN, DOWN, and other inverters. The definition of the keys is basically the same. In addition, some inverters also have function keys such as MONITORPDISPLAY, RESET, JOG, and SHIFT.
Second, Mitsubishi inverter with motor no-load operation
1. Set the power and number of the servo motor, and consider the operating current of the inverter.
2. Set the maximum output frequency, fundamental frequency and set torque characteristics of Mitsubishi inverter. The general-purpose inverters are equipped with multiple VPf curves for the user to select. The user should select the appropriate VPf curve according to the nature of the load. In the case of fan and pump loads, set the torque running code of the frequency converter to variable torque and torque reduction operating characteristics. In order to improve the low-speed performance of the inverter when starting, the torque output from the motor can meet the requirements of the production load start-up, and the starting torque should be adjusted. In the asynchronous motor variable frequency speed control system, the torque control is more complicated. In the low frequency band, since the influence of resistance and leakage reactance cannot be ignored, if the VPf is kept constant, the magnetic flux will decrease, thereby reducing the output torque of the motor. For this reason, the voltage is appropriately compensated at the low frequency band to increase the torque. Generally, the inverter is manually compensated by the user.
3. Set the Mitsubishi inverter to its own keyboard operation mode, press the run key and stop key to observe whether the motor can start and stop normally.
4. Familiar with the protection code when the operation of Mitsubishi inverter is faulty, observe the factory value of the thermal protection relay, observe the setting value of the overload protection, and modify it if necessary. The user of Mitsubishi inverter can set the electronic thermal relay function of Mitsubishi inverter according to the instruction manual of Mitsubishi inverter. When the output current of Mitsubishi inverter exceeds its allowable current, the overcurrent protection of Mitsubishi inverter will cut off the output of the inverter. Therefore, the maximum threshold of the Mitsubishi Inverter Electronic Thermal Relay does not exceed the maximum allowable output current of the inverter.
Third, Mitsubishi inverter with load test run
1. Manually operate the operation stop button of the Mitsubishi inverter panel, observe the motor running stop process and the display window of the inverter to see if there is any abnormality.
2. If the overcurrent protection action occurs in the Mitsubishi inverter during the start of the P stop motor, the acceleration P deceleration time should be reset. The acceleration of the motor during acceleration and deceleration depends on the acceleration torque, and the frequency change rate of the Mitsubishi inverter during start and brake is set by the user. If the motor's moment of inertia or motor load changes, when the speed is increased or decelerated according to the preset frequency change rate, there may be insufficient acceleration torque, which may cause the motor to stall, that is, the motor speed is not coordinated with the output frequency of Mitsubishi inverter, resulting in Over current or over voltage. Therefore, it is necessary to set the acceleration and deceleration time according to the motor inertia and load, so that the frequency change rate of Mitsubishi inverter can be coordinated with the motor speed change rate. The reason for checking whether this setting is reasonable is to first select the acceleration and deceleration time according to experience, and if there is overcurrent during the starting process, the acceleration time can be extended appropriately; if overcurrent occurs during braking, Prolong the deceleration time appropriately. On the other hand, the acceleration and deceleration time should not be set too long. If the time is too long, it will affect the production efficiency, especially when it is frequently started and braked.
3. If the Mitsubishi inverter is still protected within a limited time, the running curve of the start P stop should be changed from straight to S-shaped, U-shaped or S-shaped, anti-U-shaped. When the motor load inertia is large, a longer start-stop time should be used and the run curve type should be set according to its load characteristics.
4. If the Mitsubishi inverter still has an operation fault, try to increase the protection value of the maximum current, but you cannot cancel the protection. You should leave at least 10 to 20 protection margin. Imported pump valve
5. If the operation of Mitsubishi inverter is still faulty, replace the inverter with a larger power.
6. If the Mitsubishi inverter drives the motor to reach the preset speed during the start-up process, there may be two cases:
(1) Electromechanical resonance occurs in the system and can be judged from the sound of the motor running.
By setting the frequency jump value, you can avoid the resonance point. Generally, the inverter can set three-level jump point. When the VPf-controlled Mitsubishi inverter drives the asynchronous motor, the current and speed of the motor will oscillate in some frequency bands. In severe cases, the system will not run. Even during the acceleration process, overcurrent protection will cause the motor to fail to start normally. It is more serious when the load or moment of inertia is small. The common inverters are equipped with a frequency jump function. The user can set the jump point and the jump width on the VPf curve according to the frequency point at which the system oscillates. These frequency segments can be automatically skipped when the motor accelerates to ensure that the system can operate normally.
(2) The torque output capability of the motor is not enough. The factory parameters of different brands of inverters are different. Under the same conditions, the load capacity is different, and the load capacity of the motor may be different due to different control methods of the inverter; or Due to the different output efficiencies of the system, the load capacity will vary. In this case, the value of the torque boost amount can be increased. If it is not available, the manual torque boost function can be used. Do not set too large, and the temperature rise of the motor will increase. If it still does not work, the new control method should be used. For example, Hitachi inverter adopts the method of constant VPf ratio. When the startup fails to meet the requirements, it uses the speed sensorless space vector control method, which has greater torque output capability. For fan and pump loads, the curve for the torque reduction should be reduced.
4. Mitsubishi inverter is connected with the host computer for system debugging. After the manual basic setting is completed, if there is a host computer in the system, the control line of Mitsubishi inverter is directly connected with the upper machine control line, and the operation of Mitsubishi inverter is completed. The mode is changed to terminal control. According to the needs of the host computer system, set the range of the receiving frequency signal terminal of Mitsubishi inverter to 0~5V or 0~10V, and the response speed of the Mitsubishi inverter to sample the analog frequency signal. If an additional monitoring head is required, select the monitoring amount of the analog output and adjust the range of the Mitsubishi inverter output monitoring terminal.
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