Several cases of inverter debugging

Editor:浙江汇迅骏机电技术有限公司 │ Release Time:2021-07-02 

— First, no-load test run of the converter is carried out First check whether all the wiring of the inverter is correct, the output end of the inverter is not connected to the motor, and the inverter is first no-load test. Before powering on, read the inverter user manual carefully, get familiar with related functions, Settings and operation methods, and power on this basis.  The purpose of no-load test operation is two: one is to get familiar with the keyboard and related operation methods through practical operation, such as forward, reverse, stop and other operations, and observe the inverter action, temperature rise is normal.  2 it is the setting that combines object to come familiar with relevant function, operation method, after setting, can try the action state of basic function and action process, if rise, drop time setting to wait. On this basis, the signal of the external terminal, control action is normal, such as clockwise rotation potentiometer or change frequency when the given current, the change of the output frequency of the frequency converter is changed at the same time as the given signal.


— Inverter with motor no-load trial run

After the no-load trial operation of the inverter is normal, it can be connected to the motor for no-load trial operation.  Before connecting the motor, make sure that the technical indicators of the motor are qualified.  Do not load the motor. Then let the frequency converter drive the motor to rotate, observe whether it is normal, such as whether the direction of rotation of the motor meets the requirements. Turn the potentiometer at the given frequency counterclockwise to 0Hz at the left end, and then switch on the positive turn switch of the frequency converter (FWD), slowly rotate the potentiometer clockwise, so that the given frequency gradually increases, observe the rotation of the motor, at 50% of the maximum frequency, let the motor rotate for a few minutes, and observe the value of voltage and current,  Then let the output frequency of the converter reach its maximum frequency, and let the motor run for a few minutes.  Then reduce the output frequency to 75% or 25% of the maximum frequency, let the motor run for a while, then increase the output frequency, and then turn off the FWD switch to see whether the motor stops according to the set deceleration time.  This process basically does not need to set parameters, using the preset parameter value of the converter factory is feasible.


— Inverter on-load operation debugging

Before starting the debugging, check that there is no person working around the load and no foreign matter on the load before carrying the debugging.  During debugging, a small frequency should be given first to observe whether the load is running smoothly and whether there is abnormal sound. If so, analyze the cause; Observation, inverter torque, current whether there are abnormal, general inverter with load startup, the electrical torque is bigger, run to a given frequency, the electrical torque is stable, moreover, external load torque current have certain amplitude decrease after period, if the inverter after the operation load is achieved when rating, we must determine whether the inverter and motor selection and load match, if you have, Need to consider timely replacement of a large model of frequency converter and motor, so that the control current, torque within the range; In addition, according to the load characteristics, reasonable acceleration and deceleration time is set to ensure that the inverter does not report overcurrent fault during operation and startup.