Troubleshooting
4-4
Part 1618871−01
2020 Nordson Corporation
Air Flow Re-Zero Procedure
Perform this procedure if the Engage spray gun control screens are
indicating pattern air flow when a spray gun is off and no air is actually
flowing. This procedure re-zeros the pump control cards to eliminate false
air flow indications.
Before performing a re-zero procedure:
Make sure the air pressure being supplied to the pump cabinet is higher
than the minimum 5.86 bar (85 psi).
Each pump circuit board in the pump cabinet controls two pumps and
the pattern air for two spray guns. Make sure no air is flowing through
the pumps, around the pump control manifold gaskets, or from around
any of the solenoid valves on the manifold. Re-zeroing boards when
leaks are present in the control manifolds will result in additional errors.
Re-Zero Procedure
See Figure 4-2. For each pump board that is being re-zeroed:
1. Disconnect the atomizing and flow air tubing from all four of the 8-mm
output ports and plug the ports with tube plugs.
2. Record the board number and address settings of SW4 for each pump
board.
3. Set each address switch to zero.
4. Press the pushbutton switch SW1 to reset the module. The red LED
should be off.
5. Press and hold pushbutton switch SW2 for about two seconds, until the
red LED turns on. Release the button. The LED will turn off again in
about seven seconds. The module is now re−zeroed.
6. Move the SW4 address switches back to their original positions.
7. Press pushbutton switch SW1 again. The red LED should shut off.
8. Remove the tube plugs from the output ports.
9. On the Engage screen, check each spray gun control screen that was
previously indicating air flow when the spray gun was off. No air flow
should be indicated.
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