As an important device in the field of industrial automation, the stable operation of Siemens frequency converters is of vital importance to the production system. However, in practical applications, the following common faults may occur:
1. Power supply and input-related faults
Power failure
Abnormal input voltage (overvoltage, undervoltage, phase loss) causes the frequency converter to fail to start or trip during operation.
A damaged power module may cause a black screen or failure to boot up.
Corrosion or poor contact of the power terminal causes power supply interruption.
External wiring failure
Loose, broken cables or damaged plugs cause abnormal signal transmission.
Wiring errors (such as reversing the positive and negative poles) may directly damage the frequency converter.
2. Operation and control faults
Overload and overcurrent
Excessive motor load, too short acceleration time or improper parameter Settings trigger overload protection.
Output short circuit, insulation damage or inverter module failure cause overcurrent alarm.
Overheat protection
A malfunction of the cooling fan, a clogged heat sink or an excessively high ambient temperature can cause overheating and shutdown.
The continuous excessive load has caused the temperature of the internal components to exceed the limit.
Incorrect parameter setting
The motor parameters (such as rated power and speed) do not match the Settings of the frequency converter, resulting in abnormal operation.
Unreasonable Settings of control parameters (such as frequency and acceleration) affect the performance of the equipment.
3. Hardware and circuit faults
Control board failure
Abnormal base plate voltage (such as too low 15V), damage or short circuit of CUVC board, causing the panel to display an "E" alarm or black screen.
A malfunction of the communication board may cause data transmission interruption or control failure.
Power module failure
The IGBT module is damaged, resulting in the inability to output current or abnormal output.
A malfunction of the driver board may cause the module to malfunction or burn out.
Insurance and protection devices
The internal fuse has blown, which may be caused by overcurrent, short circuit or component damage.
If the tripping protection device malfunctions, it is necessary to check whether there is a short circuit or other abnormalities in the internal circuit.
4. Display and communication failure
Display anomaly
The panel shows no display, garbled characters or alarm codes (such as "008"), which may be caused by power failure, damage to the display module or software issues.
Backlight failure causes the screen to be dim or unclear.
Communication failure
Communication interruption with devices such as PLC and HMI may be caused by wiring errors, improper baud rate Settings or communication module malfunctions.
Protocol mismatch leads to abnormal data transmission.
5. Other common questions
Ground fault
Poor grounding of the motor or frequency converter may cause leakage, tripping or equipment damage.
Capacitor aging
The aging of the DC bus capacitor can lead to a decrease in capacity or leakage, which may cause overvoltage or undervoltage faults.
Environmental factors
Dust, moisture or corrosive gases can erode, causing short circuits in circuit boards or damage to components.
Vibration or shock causes the internal connection to loosen.