Toshiba Inverters

I am currently using inverters from Toshiba, namely the VF-nC1S and VF-S11 models.

Petty normal inverters when all is said and done, but with a couple of big advantages for the applications I am working with:

1. 110V single phase input models.
This is a big plus, since they still provide 220V three phase motor control and it allows use on U.S supplies (and others) that use 110V 1-ph. It also means that all machine units can be built and wired with a standard motor, with only the inverter needing to be changed depending on the shipping location. No 110V to 220V step-up transformers!

2. Three speed control inputs.
Three inputs as standard on the VF-S11, and by configuring a multi-use input on the VF-nC1S allows for eight distinct binary selected frequency selections. Sixteen can be selected by configuring a fourth input.



The VF-S11 models are slightly higher spec in that they have more functions and control I/O at your disposal.

A drawback of the 110V models is the lack of a built-in EMC filter, so an external one is required.

Also, the particular VF-nC1S model I am currently using - the 0.4kW model - has a relatively high earth leakage current. This is stated as 11mA in the specs, and measured at around 6-10mA depending on load. This can prove a problem if multiple units are powered from the same supply due to nuisance ELCB tripping, and the requiremnet to use a much more stringent earthing policy depending on the arrangement of units.