The carrier frequency is an important parameter for the VFD operation. If increase it, the output waveform will be better and the electromagnetic noise will be smaller, but it will increase the inverter's operating temperature, poor heat dissipation, and greater leakage current. The factory default parameters have been reasonably set, and adjustments are not recommended. If it is adjusted larger, the inverter needs to be derated for use. For every additional 1k, derate by 10%.
The inverter itself needs to consume a part of energy. The inverter has a soft start function, which can reduce the starting impulse current of the motor; the frequency can be adjusted to realize the motor speed regulation. When using a inverter, the motor has been working at the rated frequency. In this case, energy saving cannot be achieved. When the water pump or fan is driven by frequency conversion, it can replace the valve to adjust the flow, which can save energy.
For example, the parameters are set as follows:
P00.01 1 Terminal control
P00.06 6 Multi-speed setting
P01.18 1
P01.21 1
P05.00 1 HDI selection
P05.01 16 S1
P05.02 17 S2
P05.03 18 S3
P05.04 19 S4
P05.09 1 HDI speed terminal
P10.04 40% S1 on, 20Hz
P10.08 60% S1+S2 on, 30Hz
P10.16 80% S1+S2+S3 on, 40Hz
P10.32 100% S1+S2+S3+S4 on,50Hz
GD350 needs to be equipped with a Bluetooth card, scan the QR code on the inverter, download and install INVT Workshop, and open the mobile phone Bluetooth to connect to the inverter. See the video link below for more steps.
GD350 needs to be equipped with a Wifi card, scan the QR code on the inverter, download and install INVT Workshop, and open the mobile phone Wifi to connect to the inverter hotspot. See the video link below for more steps.
Set vector 0 mode. Output power calculated by formula P = UI * cos φ * 1.732
Change P02.01 = 560kw, although it is the parameter of asynchronous motor, the synchronous machine algorithm is calculated according to the power of asynchronous motor.
Change P02.18 = 400V, and force the voltage parameter to 400V.
Change P03.24 = 110% and adjust the maximum voltage limit to 110%.
You can also change P02.28 and display parameters.
Or change P08.41 over modulation, into depth modulation, do not change until absolutely necessary, will have an impact on the wave.
This is the most common fault. Inverter three-phase output UVW phase maybe short circuit phenomenon, or external electrical equipment interference, or IGBT,IPM module is damaged.
1) The mechanical load is too heavy, its main feature is that the motor is hot, touching the motor shell by hand, which is obviously hot; it can also read the running current from the inverter display screen, compare with the rated current of the motor, and judge the overload situation.
2) Three phase voltage unbalance
The operation current of a certain phase is too large, resulting in overload trip. Its characteristic is that the motor heating is unbalanced, and it may not be found when reading the running current from the display screen (because many inverter displays only one phase current); the effective method is to measure the three-phase output voltage of the inverter with a voltmeter, so as to judge whether the inverter is lack of phase or voltage imbalance.
3) Misoperation
The internal current detection part of the inverter breaks down, and the detected current signal is too large, resulting in overload trip
Lightning is divided into direct lightning and induction lightning. Direct lightning is the lightning directly falling on the lightning objects, causing the greatest damage; induced lightning is the induced high voltage generated by the electromagnetic wave generated by lightning on the conductor, which makes the electrical appliances connected to the conductor over-voltage and damage.
In the power grid, multi-stage lightning arresters have been installed, but the residual voltage of the former stage lightning or the lightning induced voltage near the inverter will still cause damage to the inverter.
Solution: install lightning arrester in inverter control cabinet.
The incoming line arrester can adopt power lightning protection module, slide installation and parallel grounding. The arrester module is gap discharge, the impulse discharge current is 15kA (10 / 350 μ s), and the working voltage is 250V. It is also possible to use parallel varistor in the power line for lightning protection.
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