Check The Electrical Grounding - Graco A Series Instructions-Parts List Manual

Check the Electrical Grounding

WARNING
Proper electrical grounding of every part of your
system is essential. For your safety, read the
warning section, FIRE
HAZARD, on page 5. Ground the system as
explained there. Then check your system as
explained below.
1. Make sure the High Voltage Power Supply is pro–
perly grounded and located outside the spray area.
The Power Supply case and spray gun actuator can
become charged if the case is not well grounded. The
ground wire is part of the high voltage circuit and
must, without fail, be connected to a true earth
ground. As an added precaution, attach a separate
ground wire to the case of the High Voltage Power
Supply.
2. Shut off the Power Supply and the air and fluid lines
to the gun.
3. Have a qualified electrician check the electrical
grounding continuity of the spray gun. Use an ohm-
meter (V) to measure resistance between the handle
of the gun (Q) and a true earth ground (U). The resis-
tance should be less than 20 ohms.
WARNING
If the resistance is over 20 ohms, the gun is not
properly grounded, and the system may be haz-
ardous. Check again that you have properly
grounded your system components; see FIRE OR
EXPLOSION HAZARD, on page 5. Since the gun
is grounded through connection to an undamaged,
properly grounded, high voltage cable and power
supply, check for a grounding problem with the ca-
ble and power supply first. BE SURE you have cor-
rected the problem before using the system.
INSTALLATION
(See Fig 1)
OR EXPLOSION
KEY
Q Gun
U True Earth Ground
V Ohmmeter
Q
Fig 1
U
V