NPE-LF10 and NPE-HF10 Powder Spray Guns
7
Part 108191C
E
2003 Nordson Corporation
Electrostatic Cable Installation
The electrostatic cable is the high-voltage link between the power unit and
the spray gun. The cable must be properly installed and maintained. If it is
damaged, the high voltage can burn through the cable, arc to a grounded
object, and start a fire or explosion.
WARNING:
Protect electrostatic cables from mechanical damage and
strong solvents. Inspect and test the cable frequently. A damaged cable
used in a hazardous environment can cause a fire or explosion that could
result in personal injury and property damage.
1. Remove the electrostatic cable (8) from the shipping box and carefully
unroll it. Establish a protected path between the electrostatic power unit
and the spray gun for the cable. The power unit end of the cable has a
metal tag on the threaded fitting and is tipped with a brass ball.
NOTE:
Do not bend the cable around a radius of less than 150 mm (6 in.)
at stationary points or 200 mm (8 in.) at flexing points.
2. Secure the cable to the gun mounting bar and other supports so it is off
the floor and out of the way of moving equipment. If you are mounting
the spray gun on a reciprocator, secure the cable so it will not be
damaged by repeated rubbing against nearby equipment or the floor.
Allow enough slack to prevent any strain on the cable.
CAUTION:
Clean the cable ends before connecting the cable to the gun
and power supply. Contaminants on the cable ends can cause arcing
between the voltage source and ground. This will damage the cable and
can significantly reduce gun performance.
3. Make sure the cable ends are clean and dry. Use isopropyl alcohol to
clean the cable ends.
4. Look into the cable adapter (9) and make sure the insulating tube is
filled with dielectric grease. Insert the spray gun end of the cable into
the cable adapter until it is pressing against the resistor spring (item 7,
Figure 3). Wipe off the dielectric grease extruded from the cable
adapter.
WARNING:
The cable end and resistor spring must be completely
embedded in dielectric grease. Air pockets could allow the high voltage to
arc and burn through the insulating tube and cable well.
5. Thread the cable retaining nut onto the cable adapter and tighten it by
hand.
6. Remove the dust cap from the power unit cable well.
7. Remove the shipping spacer from the well and fill it with dielectric oil.
8. Insert the cable end into the well until it contacts the bottom. Thread the
cable retaining nut onto the cable well and tighten it by hand. Wipe up
any spilled oil.
