0
\$\begingroup\$

Im currently working in an office environment developing a system to communicate over rs485 Modbus with an 3 phase EV charger. Due to the location it is not possible to get three phase power. However I won't be charging cars and will be using a tester(mostly to simulate car type, charge times etc) is it possible/save to hook up an 1-3 phase 1.5kW frequency regular to do this kind of testing?

Thanks in advanced

\$\endgroup\$
2
  • \$\begingroup\$ Probably not (due to sine quality). Test at location a few times, simulate the other communications. But this is more of a usage question, not design.... \$\endgroup\$
    – Jeroen3
    Sep 3, 2020 at 9:50
  • \$\begingroup\$ I just searched at a known seller of lab equipment. A 1,5kW AC source suited to replace a real grid is about 10.000 $/€. Think about emulating the 3 phase EV charger's communication. Thats cheeper and less risky \$\endgroup\$
    – schnedan
    Sep 9, 2020 at 9:30

1 Answer 1

0
\$\begingroup\$

It might be possible with a single phase using a transformer.

enter image description here

Figure 1. A VFD outline schematic. (Image source: EE.SE unattributed.)

The charger probably has an input stage similar to the variable frequency drive above. A three-phase bridge rectifier charges up the DC-link capacitor to √2 times the peak mains voltage. In Europe this would be a 400 V supply so about 560 V. Since you're not charging you might be able to run it from one 400 V supply generated by a 230 to 400 V step up transformer and connected to two of the input terminals.

I suspect that this will generate some internal "lost phase" errors which may make the exercise unusable but it might work and give you a useful error message to help debug your system.

Either way the manufacturer would be the right people to ask. A "frequency regular" will may not give out a sine wave and may have difficulty with the capacitive load.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.