Hello all,
I just received 2 brand new KR C4 compact robot controllers. They very clearly state 200-230VAC. I have 480VAC supply in my building and a 208VAC Wye transformer ready to go. When I triple checked with Kuka regarding the 208 wye, they told me it would not work, and I needed 230v single phase or 230v two-phase at a phase angle of 180 degrees. I have looked through their wiring schematics (in German...) and nothing looks like it would be damaged... But I do not know German and do not have the bill of material. The manual says:
"200 V - 230 V AC, single-phase, two-phase (with grounded neutral (as symmetrical as possible) between the phases used) 50 Hz ± 1 Hz or 60 Hz ± 1 Hz"
I took this to mean if I have two-phases they should be symmetrical about ground/neutral with regard to voltage. A 208VAC wye is symmetric about ground (120V each at 120 degree phase shift).
Has anyone run these controllers on 208VAC wye? What could possibly require 180 degree phase angle?
Thanks!