Cause : Units changeover: Reference parameter value invalid. When changing over the units to the referred representation type, it is not permissible for any of the required reference parameters to be equal to 0.0

Fault value (r0949, parameter):
Reference parameter whose value is 0.0.
See also: p0595 (Selecting technological units)

Remedy:

Set the value of the reference parameter to a number different than 0.0.
See also: p0596 (Reference quantity, technological units), p2000 (Reference speed), p2001 (Reference voltage),
p2002 (Reference current), p2003 (Reference torque), r2004 (Reference power)