2. Operation and Maintenance of Flex-Flo Control Unit
PNEG-1955
Flex-Flo Control Unit
7
LED Indicator Lights Inside Enclosure
There are three (3) LED indicator lights inside the enclosure on the lower left portion of the bottom PC
board. The left LED is red and indicates when the Flex-Flo Control Unit is in “sensitivity level programming
mode” used to adjust the sensitivity level of the safety backup switch.
The center LED is yellow and indicates when the safety backup switch has been activated and is detecting
feed. When this light is ON, the Flex-Flo auger will not run.
The right LED is green. When it is on solid, the safety backup switch has not been activated and the
Flex-Flo auger will be allowed to run as long as the auxiliary switch is calling for feed. When the green LED
is flashing, the Flex-Flo auger is in the 30 seconds time delay period prior to being allowed to run.
Figure 2C LED Indicator Lights Inside Enclosure
Safety Backup Switch Time Delay
The Flex-Flo Control Unit safety backup switch has a fixed 30 seconds time delay. Once feed falls away
from the safety backup switch, the Flex-Flo Control Unit will begin to count down until the 30 seconds has
expired. At that time, the Flex-Flo auger will be allowed to run as long as the auxiliary switch is calling for
feed. The green LED inside the enclosure on the lower left portion of the bottom PC board will flash during
the 30 seconds time delay period. Once the 30 seconds time delay period has expired, the green LED will
remain on solid and the Flex-Flo auger will be allowed to run.
Safety Backup Switch Sensitivity Level Adjustment
The safety backup switch inside the Flex-Flo Control Unit does not rely on feed pressure to activate. It
uses a special sensor inside the enclosure that can sense the presence of feed through the back plastic
wall of the enclosure. When feed builds up to a level that is even with the center of the enclosure, it
activates the safety backup switch. This prevents feed pressure from causing a bridging event once the
feed falls away.
NOTE:
The safety backup switch is factory adjusted to the proper sensitivity level for most feeds. It should
only require adjusting if it fails to activate when feed builds up inside the box behind the control unit
enclosure and causes the auger motor’s thermal overload protector to kick out.
WARNING
While adjusting the sensitivity level of the Flex-Flo Control Unit’s safety backup
switch, there is live high voltage power inside the enclosure. Use a screwdriver with
an insulated handle to adjust the sensitivity level. While adjusting the sensitivity
level, make sure to never touch any terminals or exposed bare wire ends.
