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VFD Run frequency Mode Returns -4


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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)



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