Powder Pilot
™ HD
P/N 7192721_02
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Gun Current Path
Refer to Figure 1. All electrical circuits need a complete path for current to make
its way back to the source (circle=circuit). 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
gun driver board. The current attracted to the booth is returned through the
booth ground to the controller and back to the gun.
It is very important to provide a complete circuit for the 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 and cause damage to the controller electronics (gun
driver board and power supply).
Figure Electrostatic Current Path
Powder
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™ HD
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