I am using a USC-B5-R38 to run two inverters UMI-022BE-B1
most of the time I try to start them running with "VFD Run frequency Mode" the output code becomes -4 (goes through 2 before)
The VFDs are active, Enable communication is on
vfd is connected = 1
Enable periodic status Read = 1
I can download and upload profiles but trying to get the inverters running nearly always gives me error nr -4 "Communication timeout exceeded" .
(mod edited out your email address, Daniel)