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Mistake 1: Connecting electromagnetic switches and contacts in the output circuit of the frequency converter
In practical applications, some situations require the use of contactors for frequency converter switching, such as switching to power frequency operation in case of frequency conversion failure, or when using the one driven two mode, one motor malfunctions and the frequency converter turns to drag another motor, etc. So many users may think that adding electromagnetic switches and contactors to the output circuit of the frequency converter is a standard configuration and a safe way to disconnect the power supply. In fact, this approach has significant hidden dangers.
Disadvantage: When the frequency converter is still running, the contactor opens first and suddenly interrupts the load. The surge current will cause the overcurrent protection to act, which will have a certain impact on the main circuit of the rectifier and inverter. Seriously, it may even cause damage to the IGBT output module of the frequency converter. At the same time, when carrying an inductive motor load, the energy of the inductive magnetic field cannot be quickly released, which will generate high voltage and damage the insulation of the motor and connecting cables.
Response strategy: Connect the output side of the frequency converter directly to the motor cable, and the normal start and stop of the motor can be achieved by triggering the frequency converter control terminal, achieving the effect of soft start and soft stop. If a contactor must be used on the output side of the variable frequency governor, necessary control interlocking must be implemented between the output of the variable frequency governor and the action of the contactor to ensure that the contactor can only operate when there is no output from the variable frequency governor.
Contact information: 15359293870
WhatsApp:+86 15359293870
Contact person: KELLY
Email: geabbdcs@gmail.com 386353502@qq.com
Official website:
The E2400 series frequency converter is a vector controlled frequency converter with IP55 protection level developed by Ourui Transmission. Adopting advanced vector control core and rich system functions, it has advantages such as high voltage utilization rate, high power factor, fast dynamic response, high accuracy, low noise, low rotational speed and large torque output. At the same time, it has good dynamic performance, rich application functions, and can meet the requirements of IP55 protection level. It is suitable for indoor harsh environmental conditions, such as dust, graphite, moisture, and corrosive environments.
Power range: 0.4kW~500kW
Product characteristics
Advanced vector control technology makes control more precise and dynamic performance more excellent
● Support asynchronous motor VVVF, SVC, VC control
Support permanent magnet synchronous motor SVC control
Output frequency 0.50-650.0Hz, resolution up to 0.01Hz
● Settable V/F curves and custom curves
Ultra low noise, carrier frequency adjustable from 3K to 12K
Timely and reliable control protection, high system stability, and support for parameter copying function
● Optional built-in filter
Automatic torque increase, starting torque 150%/0.5Hz, torque control accuracy ± 5%
Output frequency 0.50-650.0Hz (V/F), 0.50-200.0Hz (SVC)
● Protection level reaches IP55 level
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