Parameter setting and wiring of frequency converter in different operation modes

by:V&T Technologies     2019-11-09
There are many modes of operation of the inverter, and its parameters are also very many. To make the inverter run efficiently and serve us better, we must follow our actual situation and control requirements, select a running mode that suits us. Our company has a number of inverters produced by different companies, such as: Fuji, Siemens, Mitsubishi, Panasonic, etc. According to the experience in the work, I found that although their shapes vary widely, but the control mode is similar. Here is Fuji's FRN0. 4 ~ 220G11S- 4CX series inverter as an example, talk about its operating mode. To make the inverter run, one must have a start signal, and the other must have a speed signal, both of which are indispensable. According to whether the signal is taken from the outside of the inverter or from itself, it can be divided into the following three types: 1. E mode: that is, the signal is taken from the outside of the inverter; 2. PU mode: I . e. the signals are all taken from the frequency converter itself; 3. pu e mode: that is, the signal has both the outside of the frequency converter and the frequency converter itself. In PU mode, the operation is carried out through the panel of the inverter. Use ∧ and ∨ Keys to set the frequency, press FWD key to rotate forward, Press REV Key to rotate reverse, and press STOP key to slow down and STOP. In the operation, the ∧ and ∨ keys are used to change the frequency to achieve the purpose of changing the speed. This method is very effective when the wiring is completed and the power-on test run is completed, but it is not commonly used in normal operation because its signal is not controlled by US and is given by the inverter itself. In pu e mode, if the start signal is given by the FWD key, REV Key and STOP key of the panel, the frequency setting signal comes from the outside, this mode is not of great significance in actual operation, because it is extremely inconvenient to open the electrical control cabinet and press the corresponding keys on the panel every time it runs and stops; If the speed is not switched frequently during normal operation, we can control it like this: the start signal is given by an external switch contact or control system, and press the ∧ and ∨ keys to enter the digital frequency setting, set an appropriate frequency to store, and then run at this speed every time you run it. Only when you need to change the speed, press ∧ and ∨ to increase or decrease the speed. In this mode, two parameters are critical: parameter F01 (That is, frequency setting mode)Set to 0 ( That is, set by FWD key and REV key of the panel); Parameter F02 (Operation mode)Set to 1 (That is, through the external terminal 【FWD],【REV]As a start signal) In fact, the E mode is commonly used in practical work. The following is a focus on this mode. In this mode, many subclasses can be separated according to the signal mode of speed adjustment. These speed adjustment signals can be voltage or current, switch signals, digital inputs or pulse column inputs, which will be described in combination with different settings of parameters and hardware wiring. The speed adjustment signal adopts analog voltage and is input by terminal 12 of the frequency converter. The voltage can be 0 ~ 10 V, or-10V ~ 10 V. The former parameter F01 is set to 1 and the latter is set to 4. In addition, if reactionary operation is required, that is, 10V corresponds to low speed, 0V corresponds to high speed, and F01 needs to be set to 6. The speed adjustment signal adopts analog current and is input by terminal C1 of the frequency converter. The current signal is 4 ~ 20mA. When positive action is required, parameter F01 is set to 2; The reactionary work is set to 7. Sometimes, the voltage signal and the current signal can be combined to control the set frequency, that is, the sum of terminal C1 of terminal 12 is used as the set value. At this time, the parameter F01 is set to 3. Pay attention to the above two methods, the influence of parameters F17 and f18. F17 is the frequency gain and F18 is the frequency bias. The speed adjustment signal adopts the combination of external switch signals, and the inverter has nine contact input terminals that can be freely defined by parameters. Parameters E01, E02, E03 and E04 are defined as 0, 1, 2 and 3 respectively, the contact input terminals X1, X2, X3 and X4 are assigned as switch signals SS1, SS2, SS4 and SS8, which have 24 = 16 combinations, there are 15 kinds of combinations that are all zero, so that 15 kinds of speeds can be set to correspond to them. A potentiometer is indirectly connected to terminals 11, 12 and 13 of the inverter, and the speed can be continuously adjusted by using the internal 24VDC power supply, and the potentiometer can be installed on the control panel, this is very convenient. Using the ∧ and ∨ keys of the panel, the frequency can be changed conveniently and quickly. In fact, through parameter definition, we can lead these two signals to the terminal of the inverter. We define parameters E05 = 17 and E06 = 18, thus assigning contact input terminals X5 and X6 as growth commands (UP), Deceleration command (DOWN). Of course, we can put X1 ~ Any terminal between X9 is defined as UP or DOWN. Then set the parameter F01 to 8 (Acceleration/deceleration mode 1)Or 9 (Acceleration/deceleration mode 2) In this way, the motor speed up and down is controlled by pressing the button connected to X5 and X6. All kinds of control modes in the above E mode, the control signals are weak analog signals, which are easily subject to external interference, and the inverter itself is a large noise source. It is very necessary to strengthen anti-interference measures, the following measures are worth considering: 1. control line as short as possible, and use shielding line, pay attention to good grounding; 2. Use twin contacts for processing weak signals; 3. Connect the capacitor and ferrite core on the analog signal equipment side. Mastering various operation modes of frequency converters is of great benefit to us in choosing the appropriate frequency converter operation mode and also helps us to take our work to a new level.
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