The control frequency of the 440 inverter is switched to the given frequency and grounding requirements
1. I use USS communication and analog input to control the frequency of the inverter, but how does the inverter switch the command source of a given frequency?
MM440 inverter has three sets of two types of storable parameter groups, namely CDS defining command parameters and DDS defining drive parameters. Because there are three sets, the parameters are distinguished by Index0, 1, 2 subscripts. A switch can be used to select which set of parameters to be used currently. To adapt to the control of the command source (local, remote, mode, etc.) and the working conditions of different motors sharing one inverter (if there is only one set of motor parameters, the motor parameters need to be re-entered to change the motor). In addition, the subscript also represents a choice in other parameters (for example, different fields of communication, different connection items in free function blocks.).
2. There is another question. The power supply voltage of the inverter is single-phase 220V. Does it have requirements for the grounding of the power supply? I mean, the N wire of the power supply does not need to be grounded.
Single-phase inverters still have grounding requirements for the power supply. But it is not the grounding of the N wire, but the protective grounding PE terminal. You should not connect the protective terminal to the N wire as ground. That is totally wrong! The PE terminal should be grounded separately. Even if it is used in an apartment, there is a separate ground wire (yellow and green two-color wire) and a separate neutral wire in the apartment.
3. Does an ordinary three-phase 380V variable frequency motor only need to change its wiring method when wiring, and change the star shape to an angular shape, without considering other factors?
Ordinary three-phase 380V variable frequency motor only needs to change its wiring method when wiring, change the star shape to the angle shape, no need to consider other factors.
//The parameters that control the switch CDS command parameter group are parameters P0810 (bit 0) and P0811 (bit 1), which control a binary bit 0 and bit 1 respectively. This can form 00, 01, 11. You can see the currently selected CDS parameter group in the read-only parameter r0050. // //P0810 (P0811) is the source of setting control. For example, if you want to switch to CDS parameter group 1 with terminal 3, you should set P0703=99, and then set P0810=722.2. In this way, when terminal 3 is set to one (closed), the related control commands and frequency setting sources stored in Index(1) are all activated. For example, the parameter group Index(0) saves the start and frequency controlled by the communication link. Index(1) saves terminal control start and analog input control frequency. When you connect terminal 3, the current control becomes terminal start, and the analog input controls the frequency. // //DDS drive parameter group is similar to the above, but uses the parameters P0820 and P0821// //Of course, it is not necessarily non-use terminal, it can also be defined by a certain bit of the control word in the communication link. // //Finally, please make full use of the parameter copy function P0809 (CDS) and copy function P0819 (DDS) //
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