Sterlco SF Series Volumetric Additive Feeder - Manual (Page 45)

Additive Feeders Chapter 7: Troubleshooting 45 of 55
AC line supplying power has
too much noise.
Review routing of power wires
in machine to minimize
electrical noise. Look for other
devices which share the same
circuit and may be producing
unacceptable levels of line
noise. In some applications,
such as welding equipment, a
careful regiment of applying an
AC line filter, re-routing wires,
dividing circuits, using shielded
cable, and properly grounding
devices will usually solve the
problem.
When power is applied, “LF-L”
OR “LF-H” is displayed.
AC line supplying power to unit
has an abnormally high
frequency. The unit is designed to operate
with AC lines from 48-62 Hertz
(cycles per second). This is
typically not a problem because
the international standards are
50 and 60 Hertz.
Other service problems or questions can be answered by contacting the Service
Department.