Spray Gun Preset Settings
5-13
Part 1056418-07
E 2019 Nordson Corporation
Setting kV
The kV setting determines the voltage output of the spray gun. The higher
the output the stronger the electrostatic charge imparted to the powder.
Part geometry, distance from the gun to the part, and system and part
grounding affect the charge and the powder transfer efficiency.
See Figure 5-10. To set kV, touch the kV button then use the slider bar or
rotary dial.
Versa-Spray guns: 0 or 30−100 kV
Sure Coat guns: 0 or 25−95 kV
Prodigy guns: 0 or 25−95 kV
Setting AFC
See Figure 5-10. To set AFC, touch the AFC button and use the slider bar
or rotary dial.
Versa-Spray guns: 10−120 μA
Sure Coat, Prodigy, Encore, Encore HD guns: 10−100 μA
For Versa-Spray, Sure Coat, Prodigy, Encore, and Encore HD guns, AFC
(Automatic Feedback Current) sets the maximum current output (μA) from
the spray gun. While coating parts with this setting, the output voltage is
automatically set to maximum. If the current feedback reaches the AFC
setting then the output voltage is automatically reduced. Use AFC when
coating parts with interior corners and deep recesses at close range.
For Tribomatic guns, use AFC to set the minimum current feedback level.
If the current feedback falls below this level then the powder is not receiving
the expected electrostatic charge. The alarm relay trips and a fault
message is logged. To disable the alarm, set AFC to zero.
To set the minimum current feedback level, start coating parts. Note the μA
output (yellow) on the status display (page 5-3), then set AFC to a lower
number. A typical setting would be 0.5−1.0 μA lower than the output of a
new Tribomatic gun. The setting resolution is 0.1 μA.
NOTE: Different types of powders tribo-charge at different levels, so if you
switch powders you may also have to change the alarm level.
Select Charge Mode
See Figure 5-10 and Tables 5-5 and 5-6. Select Charge mode provides you
with three pre-programmed electrostatic charging modes (Modes 1−3) and
one user programmable mode (Mode 4). The settings for modes 1−3
cannot be changed. Mode 4 allows both kV and μA to be set for a particular
powder or part. Mode 0 turns off Select Charge so you can set kV or AFC.
Select Charge mode is not used with Tribomatic guns.
Touching the Select Charge button repeatedly toggles through the modes.
The icon next to the button indicates the mode setting. Mode icons and
descriptions of each mode are described in the following tables:
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