The inverter 's settings menu is divided into primary menus, secondary menus, etc., with parameters listed after each menu item. The left image shows accessing the primary menu of the Altivar31 inverter, and the right image shows parameter settings.
The image on the right shows the process of starting from standby (ready to run), setting the Fun-PSS-SP2 parameter to 15Hz, and then returning to standby.
In actual setup, you might start from a certain step in the middle. If there are other parameters that need to be set, you don't need to return to standby mode; just return to the corresponding level and continue setting. After all parameters are set, you need to return to standby mode to prepare for startup. Some parameters can also be set during certain processes of the inverter.
Incorrect settings may damage the frequency converter! Do not set parameters you do not understand!
Commonly used parameters are those that are frequently used, mainly including the following (taking the Altivar31 frequency converter as an example):
1. Upper limit frequency (high speed) SEt-HSP and lower limit frequency (low speed) SEt-LSP
The upper frequency limit is the frequency corresponding to the maximum setpoint, and the lower frequency limit is the frequency corresponding to the minimum setpoint. Setting these upper and lower frequency limits is to restrict the motor speed, thereby meeting the requirements of equipment operation control.
2. Acceleration time (acceleration ramp time) SEt-ACC and deceleration time (deceleration ramp time) SEt-dEC
Acceleration time is the time required for the frequency converter to accelerate from 0Hz to the rated frequency (usually 50Hz). The acceleration ramp type is set by FUn-rPC-rPt. Deceleration time is the time required for the frequency converter to decelerate from the rated frequency to 0Hz. The acceleration and deceleration times must be matched to the acceleration and deceleration of the load. The larger the motor power, the longer the required acceleration and deceleration times. Generally, for motors below 11kW, the acceleration and deceleration times can be set to within 10 seconds.
For large-capacity motors, setting the acceleration time too short may cause the inverter to trip due to overcurrent; setting the deceleration time too short may cause the inverter to trip due to overvoltage. In situations where multiple motors operate synchronously, setting the acceleration time too short may cause the inverter to trip due to overcurrent, while setting the acceleration time too long will degrade the synchronization performance during startup. Setting the deceleration time too short may cause the inverter to trip due to overvoltage, while setting the deceleration time too long, due to differences in motor power and load, may prevent the motors from stopping simultaneously, making subsequent startup difficult.
Therefore, when multiple motors are running synchronously, it is necessary to accurately set the acceleration and deceleration times, which is also one of the main items in equipment commissioning.
3. Save the configuration drC (or IO, CtL, FUn) —SCS
Frequently used settings or settings that have been tested and proven effective on-site can be saved and restored when needed. However, configurations can only be saved once; when saved again, the previously saved settings will be replaced by the newly saved settings.
Once the SCS parameter is saved, it automatically becomes nO.
4. Return to factory settings/restore configuration drC (or IO, CtL, FUn) — FCS
During the commissioning of the frequency converter, occasional functional or data corruption may occur due to improper operation. In such cases, you can restore the configuration (FCS parameter set to rECI) or return to the factory settings (FCS parameter set to InI) and then reset the parameters.
Once the FCS parameter is saved, it automatically becomes nO.
5. Motor phase loss detection FLT-OPL
Motor phase loss detection is a fundamental function of frequency converters and is essential for practical use. However, in the Jinan Xingke test bench, the equipped motor had too low a power and was unloaded, resulting in almost zero motor current. The frequency converter could not detect the motor current and assumed no motor was connected. Therefore, in the laboratory, the OPL parameter must be set to nO (motor phase loss detection disabled), otherwise the frequency converter will not operate. However, in actual use, the OPL parameter must be set to yES (motor phase loss detection).
General-purpose frequency converters have many functions, menus, and parameters. The Altivar31 frequency converter has eight primary menus: the setting menu SEt-, the motor control menu drC-, the IO menu IO-, the control menu CtL-, the application function menu FUn-, the fault menu FLT-, the communication menu COM-, and the display menu SUP-.
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