Frequency converter repair
We repair frequency inverters from a wide range of manufacturers and power classes quickly, reliably and cost-effectively. The frequency inverter controls asynchronous and synchronous motors and enables infinitely variable speed and torque control. This allows motors to be used flexibly in drive electronics. Frequent sources of faults are defective power semiconductors, control boards, power supply units or capacitors. After a comprehensive diagnosis, we only replace the components that are actually damaged. On request, we can overhaul the entire device to minimise downtime and extend its service life.
Functionality of a frequency inverter
A frequency inverter generates a DC voltage from the mains frequency. This DC voltage is then converted into the desired output voltage and frequency.
Power components
In order for the frequency inverter to fulfil its function, it requires power components. The most important power components from the frequency inverter are described below.
Electronic switches
Electronic switches are, for example, mosfets, IGBTs and transistors. They are used wherever a small current needs to control a large current.
Rectifier
Diodes are referred to as rectifiers. The electrical property of diodes is that they only ever allow current to pass in one direction. This function allows them to be used to convert alternating voltage into direct voltage.
Interfaces to the frequency converter
There are various interfaces so that you can work with the frequency inverter. Many Fus have a small display with buttons for viewing and changing the parameters. The frequency inverter can be parameterised and checked on site here. There are also usually a few analogue and digital inputs to implement simple controls directly with the frequency inverter. To enable other devices to work with the frequency inverter, there are various BUS systems that are used for communication.
Areas of application for frequency inverters
There are many areas of application for frequency inverters. We have summarised a few of the most common ones for you.
Pumps and fans Application
Frequency converters are used for soft starting, air volume/water volume control or pressure control. This means that the fan/pump control can be used in many different applications.
Lifting and moving applications
Control systems for lifts, escalators and conveyor belts are always implemented with frequency converters. The frequency inverter is used to realise smooth start-ups, different speeds, changing directions of rotation, etc.
Servo drive
Frequency inverters are also used for the servo drive. With a sensor on the motor, the controller always knows exactly where the motor is and can set or hold it to within a few millimetres. An example of a servo drive is the XYZ control on large CNC machines.
Typical faults of frequency inverters for repair
The tolerances of individual components change over time due to long and heavy use. This can lead to the frequency inverter no longer fulfilling its function. In such cases, a professional frequency inverter repair can help. You will find typical faults in the following section, many of which we can reliably rectify. For more information on frequency inverter repair, please contact us by phone or email.
No more drive
The display shows and outputs error codes. The history is usually filled with faults. The engine is completely without function, has no power or keeps failing.
No communication
The control system or visualisation can no longer communicate with the frequency inverter. The motor can usually still be controlled using the display on the frequency inverter.
Input no longer possible or display without function
The frequency inverter functions normally via the external control, the display is without function and no longer accepts any input.
Complete failure
The display no longer shows anything and communication with the frequency inverter has also failed. In addition, the circuit breaker may trip as soon as the frequency inverter is connected to the mains.
