Greetings Experts!
We are planning to use a couple of frequency-convertes (or is VFD the correct English term?) to adjust the speed of some pumps.
These are relative small motors (1,5kW). We have not decided for witch manufacturer of VFD we are going to use, but it will probably be telemecanique.
My question is, from a PLC I/O point of view, what signals are needed to control the VFD?
My guess is that it must have a analog output value (4-20mA) for speed reference, and a digital output run-signal. And also a digital input signal for run-feedback? Is this correct?
Regards
JSMtek
We are planning to use a couple of frequency-convertes (or is VFD the correct English term?) to adjust the speed of some pumps.
These are relative small motors (1,5kW). We have not decided for witch manufacturer of VFD we are going to use, but it will probably be telemecanique.
My question is, from a PLC I/O point of view, what signals are needed to control the VFD?
My guess is that it must have a analog output value (4-20mA) for speed reference, and a digital output run-signal. And also a digital input signal for run-feedback? Is this correct?
Regards
JSMtek