First, the inverter's no-load current test
1. Ground the ground terminal of the inverter.
2. Connect the power input terminal of the inverter to the power supply through the leakage protection switch.
3. Check if the factory display of the inverter display window is normal. If it is not correct, it should be reset. Otherwise, it is required to be returned.
4. Familiar with the operation keys of the inverter.
The general inverter has 6 keys, such as running (RUN), stop (STOP), programming (PROG), data P confirmation (DATAPENTER), increasing (UP, â–²), reducing (DOWN, "), different inverter operation. The definition of the keys is basically the same. In addition, some inverters also have function keys such as monitoring (MONITORPDISPLAY), reset (RESET), JOG, and shift (SHIFT).
Second, the inverter with motor running at no load
1. Set the power and number of poles of the motor, and consider the working current of the inverter.
2. Set the maximum output frequency, fundamental frequency and set torque characteristics of the inverter. The choice of VPf type includes items such as maximum frequency, base frequency and torque type. The highest frequency is the highest frequency that the inverter-motor system can operate. Since the maximum frequency of the inverter itself may be high, when the maximum frequency allowed by the motor is lower than the highest frequency of the inverter, it should be set according to the requirements of the motor and its load. set.
The basic frequency is the dividing line between the inverter for constant power control and constant torque control of the motor, which should be set according to the rated voltage of the motor. The torque type refers to whether the load is a constant torque load or a variable torque load. The user selects one of the types according to the VPf type map and load characteristics in the inverter's instruction manual. 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. The Hitachi J300 frequency converter offers users two options: self-setting and automatic torque boost.
3. Set the 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 inverter runs faulty, observe the factory value of the thermal protection relay, observe the set value of the overload protection, and modify it if necessary. The user of the inverter can set the electronic thermal relay function of the inverter according to the instruction manual of the inverter. The threshold of an electronic thermal relay is defined as the ratio of the rated current of both the motor and the frequency converter, usually expressed as a percentage. When the output current of the inverter exceeds its allowable current, the overcurrent protection of the inverter will cut off the output of the inverter. Therefore, the maximum threshold of the inverter electronic thermal relay does not exceed the maximum allowable output current of the inverter.
Third, with load test run
1. Manually operate the running stop button of the 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 inverter has overcurrent protection during the start of 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 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 and the inverter output frequency are not coordinated, resulting in overcurrent. 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 the 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 inverter is still protected for a limited time, change the running curve of the start P stop, change from straight line to S-shaped, U-shaped line or reverse S-shaped, anti-U-shaped line. 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 inverter still has an operation fault, try to increase the protection value of the maximum current, but you cannot cancel the protection. Leave at least 10% to 20% of the protection margin.
5. If the inverter operation failure still occurs, replace the inverter with a larger power.
6. If the inverter drives the motor, the preset speed cannot be reached during the startup process.
Five types of frequency converter operation method (1)1. Operation of Fuji inverter:
2. Fuji inverter setting:
First, press the PRG key to display the menu - press the FUNC key to display the menu details - press the ∧ , ∨ key to move the cursor selection item - press the FUNC key to display the corresponding content - enter the data, use the SHIFT "> key to arbitrarily select the data to be changed Bit - press FUNC to save it to memory - press RESET and PRG to return to the original state.
The setting procedure of the parameters during self-learning is the same as above, and the parameter F02 is set to 0, then press the FWD or RWD key - the spindle of the machine tool is automatically turned to stop and then press the STOP key - then set the parameter F02 to 1 to complete the frequency conversion. The operation of the device.
1. Yaskawa inverter
2, Yaskawa inverter settings
(1) Language replacement process:
First, press the MENU/ESC key several times to enter the Programming menu - press the ENTER key - display A1-00 = 1 - use the "" key to move the cursor to select the number of digits to be changed to enter data - press ∧, ∨ key to select To change the value of the data - change to A1-00 = 0 - enter the English language control state - press ENTER to save it to the memory.
(2) Self-tuning process:
First, press the MENU/ESC key several times to enter the AUTO-TUNING menu - press the ENTER key - press the ∧ , ∨ key to move the selection item up or down - press the ENTER key to enter - use the "" key to move the cursor to select the bit to be changed The number can be entered into the data - press ∧, ∨ to select the value of the data to be changed - press ENTER to save it to the memory - repeat the above steps and then input the following sum into the inverter - press ENTER When “TUNING READY?†“PRESS RUN KEY†appears, press the “RUN†button to start auto-tuning. The “TUNE SUCCESS†message appears at the end of the auto-tuning. Press "MENU" again to put the inverter in the "QUICK SETTING" state.
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