2. Operation and Maintenance
PNEG-2223
Flex-Flo Control Unit with Auto Calibration
11
Bypass Mode
If auto or manual calibration still does not allow the auger to run, the unit may be set to “Bypass Mode”.
This mode is only available for units manufactured in November of 2018 and after. In bypass mode, the
auger will run for a maximum of 2 hours or until the primary feed sensor shuts it OFF. To set the control
unit (FLX-5350) into bypass mode, power up and push the grey button once within the first 5 seconds after
the red light has flashed once. The auger will turn ON and the green indicator light will be on solid while
the yellow indicator light will flash quickly. To disable bypass mode, re-cycle power.
Error Signals
Broken Sensor
The red external LED will continuously flash in normal runtime mode.
Calibration Failed or Lost
If the red external LED continuously flashes very quickly and the auger does not run, the calibration has
failed or been lost. A Manual Calibration must be performed to correct this problem. See “Manual
Calibration”
.
Replacing Top Circuit Board
Before determining if top circuit board is bad, contact your nearest AP or Cumberland Service
Representative to aid in diagnosis.
To replace the top circuit board, begin by removing the “Incoming Power” and “Flex-Flo Motor” wires from
the left terminal block. Un-plug the “Auxiliary Switch” terminal block plugs on the right side of the top circuit
board. Unplug the “Toggle Switch” spade terminal wires from the right side of the top board. These wires
must not be reversed. Remove the Flex-Flo relay terminal connection from the left side of the top board.
Remove the four (4) screws (S-7393) that secure the top board to the bottom enclosure.
To attach a new top circuit board, reverse the procedure above.
Figure 2D Remove Connections from Board
