During the past few weeks, I've been working with Schneider and Delta E series inverters to test multi-speed control configurations. Today, I'd like to share what we found so far. Let's start with the Schneider inverter. Since most models in the Schneider range have similar parameters and functions, I'll use the ATV32 series as an example.
In our application, we used the digital input channels to set different speeds. Typically, LI1 is for forward rotation, LI2 for reverse, and LI3, LI4, and LI5 are used for speed selection. The relevant parameters are PSS-SP2, PSS-SP3, etc. The wiring was done using a common anode 24V configuration.
If you only need two speeds, you can use just LI3. When LI3 is at a low level (0), it activates low speed, which is determined by the LSP parameter. When LI3 is at a high level (1), usually controlled by a PLC output coil (KA), the inverter switches to high speed.
For three or four speeds, you need to activate two channels: LI3 and LI4. This works similarly to binary code. Here’s how it works:
- LI4 = 0, LI3 = 0 → Low Speed
- LI4 = 0, LI3 = 1 → Second Speed (SP2)
- LI4 = 1, LI3 = 0 → Third Speed (SP3)
- LI4 = 1, LI3 = 1 → Fourth Speed (SP4)
This method allows up to 16 different speed settings by using more channels. It’s pretty cool how such a simple setup can give you so much flexibility. If you're into automation or motor control, this kind of configuration is really useful.
Today, I’ve only covered the basics of the Schneider inverter. In the next session, I’ll go over the Delta E series and share some of the experiences and challenges we faced. If you have any questions or think I missed something, feel free to comment below. Thanks for reading!
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