Nordson Encore HD iControl 2, Installation, Troubleshooting, Repair

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3-12 Installation
Spray Gun Current Path
See Figure 3-6. All electrical circuits need a complete path for current to make its way
back to the source. Electrostatic spray guns emit current (ions) and therefore require a
complete circuit. Some of the current emitted by the spray gun is attracted to the spray
booth, but most is attracted to the grounded parts moving through the booth. The current
attracted to the parts flows through the part hangers to the conveyor and to the building
ground, back to the controller through a ground braid and back to the spray gun through
the spray gun driver board. The current attracted to the booth is returned through the
booth ground to the controller and back to the spray gun.
It is very important to provide a complete circuit for the spray gun current. A break in
the circuit conductors (conveyor, booth, braided ground cables, controller) can cause
voltage to build up on the conductors up to the maximum output of the spray gun voltage
multiplier (up to 100 kV). The voltage will eventually discharge in a high frequency arc,
which can cause damage to the controller electronics (spray gun driver board and power
supply).
Spray Gun Current Path
Ions
iControl 2
Ground Braid
Figure 3-6 Electrostatic Current Path