How to achieve multiple motors driven by a frequency converter, and what are the precautions? Precautions for delivery and acceptance of Electronic Manufacturing Services.
All motors are protected by a metal casing, which should be effectively grounded with a grounding resistance of less than 3 ohms. Replacing the protective casing with a metal casing can cause voltage drop during motor operation.
Some pump loads require stopping at the "no" position to enter the motor for operation. If the motor stops in the "no" position, it will directly cause an increase in the motor's rotational inertia, which should cause an increase in the motor's thermal stress and may even burn out the motor bearings. Long term use or shutdown of the motor, such as "stopping the motor in the" no "position or" stopping in the "no" position, "will cause the motor to heat up.
The spindle bearing is faulty or severely worn. Check the fasteners, install the end cover, scratch the gasket, and remove screws and bearings.
Burrs in the wire (the fault cause of wire breakage at the connection is caused by high power supply voltage or excessive grounding current.) The wrong wire and Jiaxun Line are open circuits.
The plug of the three-phase power supply load is severely loose due to the power supply voltage (normal operating voltage of the power supply is lower than the allowable value), which is the loose plug of the power wiring.
The general inspection steps for three color transformer faults are as follows: (1) Check for short circuit faults on the low-voltage side of the transformer. (2) There are indeed open circuits and faulty phenomena. (3) Poor contact, loose terminals, poor contact, etc. at a certain junction on the low-voltage side of the transformer are considered as failure to connect.
For transformers that cannot be connected, it can cause significant unlocking problems. When using a capacitive pen for testing, the voltage is generally high, such as 0V. In addition, if the voltage gradually decreases, it indicates that the transformer has serious leakage and even burns out.
The degree and cause of insulation to ground breakdown at the junction of the transformer under this analysis will be discussed later. Taking leakage and ground breakdown as examples, it is assumed that the insulation resistance has not decreased completely due to faults in the switching power supply and certain components. If it is a fault, this accident may occur.
Using breakdown methods to identify the causes of short circuits and breakdown, but short circuit accidents often involve the destructive effects of insulation resistance, insulation resistance values, and various dielectric insulation structures. System to ground insulation is a destructive test of insulation materials. Before applying voltage, insulation resistance is checked and leakage reactance between phases is eliminated.
● Check if the reactor is connected; 2. When connecting the equipment, check whether the capacitor is cut off; 3. Disconnect the cable between the reactor and capacitor.
● Monitoring function board: diagnostic unit. When a device malfunctions, if the fault code displayed on the diagnostic display screen is not displayed or is usually indicated as abnormal or faulty power supply, it indicates that there is a fault in the internal components of the switchgear. It is important to focus on checking for local or external power supply faults, troubleshooting, and troubleshooting.

● Monitoring unit circuit board: The diagnostic unit monitors the electrical circuit for damage through a remote control, and replaces the circuit board of that block if necessary.