Hello,
I would like to use SSRs to control ( forward/reverse ) an AC motor in a new machine I am building for work. Motor specs:
TEC 0.18kW (0.25HP) Single Phase 240V Capacitor Run 4 Pole.
Full Load Current - 1.5A.
Starting Current is 4A.
https://www.inverterdrive.com/group...EC-Single-Phase-Motor-180W-1400RPM-LST-63F-B3
https://www.inverterdrive.com/file/Motor-Connections-TEC-TPC
I have used the same motor in a previous project which was controlled manually using standard electrical mini-contactor blocks but this caused large voltage spikes and was causing emf havoc with the micro-controller I was using to control the rest of the machine. I installed standard plug-in emf suppressor modules on the contactors and spent a lot of time trying to shield against emf but all this only partly cured the problem.
In the new machine I would like to use SSRs to eliminate emf problems and also to allow me to control the AC motor via the micro-controller. As far as I understand SSRs are generally not recommended for AC motor control, standard contactors being the preferred option ( comments? ). Having said that I found an SSR solution ( http://www.jelsystem.co.jp/en/product/ssr/ssr_oyo.html, application circuit N.o 4 ) that apparently works. Unfortunately the diagram is not self explanatory and I don't know enough about electrics to be able to:
1) Fully determine suitable SSR specs for the motor I am using
2) How to relate the motor connections in the SSR schematic to that of the motor I am using
3) What components the two black 'bow-tie' symbols are referring to and why they are there...
The above would be the best solution in terms of EMF elimination and control and also keep component count to a minimum, otherwise there are two other less preferred ( but for me more understandable ) options:
1) Use a couple of standard contactors and have them operated using SSRs to power the contactor coils ( with contactor emf suppressors installed ). I will still get some EMF but able to use M/C for control.
2) Use two separate banks of SSRs wired raw into the motor so that each bank would independently power the motor in forward and reverse mode (effectively swapping out the original contactors and replacing with SSRs ).
These are the SSRs I am thinking of using for 1) and 2) above:
http://www.rapidonline.com/Electron...lid-State-Relay-Din-Module-5A-3-15VDC-50-9509
Suitable? Issues..?
Long post I know, but I wanted to get as much relevant info in as I could...
Anyone able to help/point me in the right direction..?
Thanks!
I would like to use SSRs to control ( forward/reverse ) an AC motor in a new machine I am building for work. Motor specs:
TEC 0.18kW (0.25HP) Single Phase 240V Capacitor Run 4 Pole.
Full Load Current - 1.5A.
Starting Current is 4A.
https://www.inverterdrive.com/group...EC-Single-Phase-Motor-180W-1400RPM-LST-63F-B3
https://www.inverterdrive.com/file/Motor-Connections-TEC-TPC
I have used the same motor in a previous project which was controlled manually using standard electrical mini-contactor blocks but this caused large voltage spikes and was causing emf havoc with the micro-controller I was using to control the rest of the machine. I installed standard plug-in emf suppressor modules on the contactors and spent a lot of time trying to shield against emf but all this only partly cured the problem.
In the new machine I would like to use SSRs to eliminate emf problems and also to allow me to control the AC motor via the micro-controller. As far as I understand SSRs are generally not recommended for AC motor control, standard contactors being the preferred option ( comments? ). Having said that I found an SSR solution ( http://www.jelsystem.co.jp/en/product/ssr/ssr_oyo.html, application circuit N.o 4 ) that apparently works. Unfortunately the diagram is not self explanatory and I don't know enough about electrics to be able to:
1) Fully determine suitable SSR specs for the motor I am using
2) How to relate the motor connections in the SSR schematic to that of the motor I am using
3) What components the two black 'bow-tie' symbols are referring to and why they are there...
The above would be the best solution in terms of EMF elimination and control and also keep component count to a minimum, otherwise there are two other less preferred ( but for me more understandable ) options:
1) Use a couple of standard contactors and have them operated using SSRs to power the contactor coils ( with contactor emf suppressors installed ). I will still get some EMF but able to use M/C for control.
2) Use two separate banks of SSRs wired raw into the motor so that each bank would independently power the motor in forward and reverse mode (effectively swapping out the original contactors and replacing with SSRs ).
These are the SSRs I am thinking of using for 1) and 2) above:
http://www.rapidonline.com/Electron...lid-State-Relay-Din-Module-5A-3-15VDC-50-9509
Suitable? Issues..?
Long post I know, but I wanted to get as much relevant info in as I could...
Anyone able to help/point me in the right direction..?
Thanks!