|
1, no-load power converter test
1. To the inverter earth ground terminal.
2. The power converter input terminals through the leakage protection switch received power on.
3. Check inverter display window of the factory display is normal, if not correct, should be reset, or requests returned.
4. Familiar with the operation of key converter.
General inverter are running (RUN), stop (STOP), programming (PROG), data / confirmation (DATA / ENTER), increase (UP, ▲), reduced (DOWN, ▼) and other six keys, different frequency the definition of machinery operation is basically the same key. In addition, there is some converter to monitor (MONTTOR / DISPLAY), reset (RESET), Jog (JOG), shift (SHIFT) and other function keys.
Second, run the inverter with motor load
1. To set the motor power, very few, the work to be taken into account the current inverter.
2. Set the maximum inverter output frequency, fundamental frequency, set the torque characteristics. V / f type options include the highest frequency, fundamental frequency and type of project torque. The maximum frequency is inverter - motor system can run the highest frequency, because the highest frequency converter itself may be higher, when the motor is allowed a maximum frequency of less than the maximum frequency converter, motor and load requirements should be established set. Fundamental frequency is constant power converter of the motor control and constant torque control of the line, should be rated motor voltage setting. Type refers to the load torque is constant or variable torque load torque load. User manual in accordance with inverter V / f type map and load characteristics, select one of a type. General Inverter are available in a number of V / f curve for the user to select the user in the nature of use should be selected according to load the appropriate V / f curves. If the fan and pump load, the torque converter to run the code set to become operational characteristics of torque and reduced torque. In order to improve performance at low speeds when the converter starts, the motor output torque can satisfy the requirements of the load starts to adjust the starting torque. In the induction motor speed regulation system, the torque control more complex. In the low frequency range, due to resistance, anti-leakage effect can not be ignored, if maintained V / f constant, the flux will decrease, thus reducing the motor's output torque. To this end, the voltage at low frequencies to the appropriate compensation to increase torque. General inverter by the user manually set the compensation. Hitachi J300 inverter was providing two options: self-configuration and automatic torque increase.
3. The converter is set to bring their own keyboard operation mode, press the run button, stop button, observe whether the normal motor start and stop.
4. Familiar with the converter to run the code protection failure to observe the thermal protection relay of the default setting, observe the overload protection settings can be modified when necessary. Staff can use the inverter by inverter instruction manual of the inverter's electronic thermal relay function settings. Electronic thermal relay is defined as the threshold between the motor and inverter rated current ratio, usually expressed as percentage. When the inverter output current exceeds its allowed current, the inverter over-current protection will cut off the inverter output. Therefore, the inverter's electronic thermal relay does not exceed the maximum threshold of the maximum allowable output current of the inverter.
Third, load test run
1. Manually operated inverter operation panel to stop key to stop the process of observation of motor and inverter to run the display window to see if there are anomalies.
2. If the start. Stop the motor over-current protection movement emerged during the transducer should be re-set speed
, Deceleration time. Motors in Canada and the acceleration of deceleration depends on the acceleration torque, while the frequency converter in the Kai, the frequency of the braking process the rate of change is the user settings. If the motor moment of inertia or motor load changes, a pre-determined rate of frequency change is accelerated or deceleration, there may be insufficient acceleration torque, resulting in motor stall, the motor speed and output frequency to lack of coordination, resulting in excessive current or voltage. Therefore, the need to motor inertia and load plus a reasonable setting, deceleration time, the rate of change to the frequency converter motor speed change rate with the coordination. Check the settings are a reasonable approach is to add the selected first by the experience, deceleration time settings, if there have been during the startup process flow, can be appropriate to extend the acceleration time; if overflow occurs during braking, then appropriate to extend the deceleration time. On the other hand, Canada should not set the deceleration time is too long, too long will affect productivity, especially frequent Kai, braking.
3. If the frequency converter is still protected within the time limit should be changed start / stop operation curves, from linear to S-shaped, U-shaped line or anti-S-shaped, anti-U-shaped line. Motor load inertia is large, it should start with a longer stop time and run according to the load characteristic curve of the type set.
4. If the transducer is still operational failure, should try to increase the maximum current protection value, but can not cancel the protection, should be left at least 10% -20% of the protection margin.
5. If the inverter or operational failure occurred, replace the more a power inverter.
6. If the frequency converter driven motor in the startup process reach preset speed, there may be two situations:
(1) mechanical and electrical system at resonance, the sound operation from the motor to judge. Value by setting the frequency hopping method, you can avoid the resonance. General inverter can be set to three jump points. V / f controlled inverter drive induction motor, in certain frequency bands, the motor current, speed oscillation occurs, the system can not run a serious, even in the acceleration process occurs over current protection does not start the motor, the motor light load, or moment of inertia is small, even more serious. With frequency converter were common across jump, users can point system in the frequency of oscillation, in the V / f curve set point and cross-cross jump jump width. When the motor speed can be automatically skip these frequency bands to ensure that the system can function properly.
(2) the motor torque output capability is not enough, different brands of converter factory set different parameters in the same conditions, with a carrying capacity of different inverter control methods may also be due to different causes in different motor load capacity; or the efficiency of the system output due to different causes with a carrying capacity will vary. In this case, can increase the amount of torque increase value. If you fail, torque increase can be used manually, do not set too large, the motor temperature rise will increase this time. If still not, should use the new control methods, such as Hitachi inverter with V / f ratio constant method, start fail, they use speed sensor space vector control method, it has more torque output capacity. For the fans and pump load, should reduce the value of reducing the torque curve.
IV converter connected with the host computer for system debugging
The basic setup is complete in the manual, if a host computer system, the inverter control line control line directly with the host computer connected to the inverter mode of operation and to terminal control. According to the needs of PC system, it is set to receive the frequency signal pin converter range 0-5V or 0-10V, and the sampling frequency converter on the analog frequency signal response speed. If you need additional monitoring header, select the analog output of the monitor should be the amount, and adjust the inverter output terminals to monitor the amount of range.
|
