Siemens inverter M430 frequency given programming - Database & Sql Blog Articles

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I'm checking the data and trying to understand how the frequency signal works. It mentions that the given signal has both current and voltage components. For example, a 0-10V signal is used to generate a frequency of 0-50Hz. When programming the PLC for frequency input, some conversion is required. The question is whether the given frequency should be multiplied by 50Hz, and if dividing the signal word by 10V (i.e., 50 * word / 10) is correct. Is the voltage signal actually up to 100V? That doesn’t seem right, but I've seen the program in the image. I think it might mean that 0-100V corresponds to 0-60Hz, but I’m not sure. Could someone clarify this? I asked about this image before, but the issue wasn't resolved. Can the frequency be set at any time during debugging, or is it fixed once programmed? From what I’ve seen, it seems like the frequency value is set once, but maybe it can be adjusted during testing. I haven’t worked on-site or interacted with the inverter directly—just reviewed the program. Frequency Converter Frequency Reference: A: To set the frequency reference, you only need to configure the maximum frequency (P1082), minimum frequency (P1080), and reference frequency (P2000). The 0-10V input will be automatically calibrated. For instance, if your minimum frequency is 0Hz and the maximum is 100Hz, then 0V corresponds to 0Hz and 10V to 100Hz, with a linear relationship between them. You can also add a dead zone to reduce zero drift. If you're setting the value through the PLC, you can easily limit the upper and lower bounds within the program. As for calculating speed, use the formula: 60f/p = synchronous speed. The actual speed will be slightly less due to slip. At 100Hz, the rotor speed would be 60f/p × (1 - s), where s is the slip rate. However, when the motor operates above its rated frequency, it enters constant power mode, and torque decreases as speed increases.

1. In PLC programming, does the frequency need to be converted? Should the given frequency be calculated as 50Hz multiplied by the signal word divided by 10V (i.e., 50 × word / 10)? Yes, conversion is needed, but it's not as complicated as you might think. You just need to provide a relative percentage of the desired frequency. For example, if you want to set 40Hz and the reference frequency is 50Hz, the PLC only needs to output: 40 × 16384 / 50. (Note: P2000 is set to 50Hz, and 16384 represents 100% of the reference.) 2. Is the voltage signal given by the frequency actually 100V? No, that’s not possible. Otherwise, the analog input port of the inverter would be damaged by overvoltage. 3. Can the frequency reference be adjusted at any time during debugging, or is it fixed once programmed? The frequency reference can be set dynamically during debugging. It's a flexible process, and the settings can be changed as needed depending on the application.