2. Operation and Maintenance
10
PNEG-2223
Flex-Flo Control Unit with Auto Calibration
Safety Backup Switch Sensitivity
The safety backup switch inside the Flex-Flo Control Unit does not rely on feed pressure to activate. It
uses a special electronic 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 feed.
Calibration Mode
Calibration Mode is used to correct the unit when the Safety Backup Switch does not properly sense the
presence of feed through the enclosure and housing wall. It may fail by sensing feed that is not present
and prevent the auger motor from starting. Or it may fail by not sensing feed that is present and prevent
the auger from shutting off when full, resulting in a motor overload.
When starting Calibration Mode, the sensitivity will be displayed by flashing the external red LED.
During Calibration Mode, the external red LED will flash 4 times, followed by a pause. It will continue this
sequence of flashes for 15 seconds, before completing a red/green LED flashing sequence for 5 seconds
at the end of the Calibration Mode cycle.
NOTE:
In Calibration Mode feed MUST NOT be in front of the Flex-Flo Control Unit.
Auto Calibration at First Time Start-Up
When the customer receives a new Flex-Flo unit, it will not be calibrated. Upon start-up the first time the
unit receives power, the Flex-Flo will automatically enter Calibration Mode. See Calibration Mode above.
Manual Calibration
When the light is not solid green and the Manual ON button is pressed, the yellow light will begin to flash.
Release the button then press and hold the button again and the auger will turn ON. (This is to prevent
the case of a button failure and keeping the auger running.) If the button is held down for 5 seconds, the
flashing will stop (the yellow LED will go OFF) and a manual calibration will automatically be performed.
There will be no other light indicators for the calibration.
Alternate Manual Calibration
At start-up (turn the power switch on the side from the OFF to the ON position) the red external LED light
will flash one time. Right after the one flash and the LED turns OFF, turn the power switch OFF and back
ON again. The red external LED will now flash two (2) times. When the LED goes OFF after the second
flash, turn the power OFF and back ON again. The red external LED will now flash three (3) times.
After the third flash, turn power OFF and back ON. The unit will now enter Calibration Mode.
Auto Calibration
The control unit will sense changing environmental conditions and automatically perform calibrations
as needed.
