High Potential Test Of Finished Units - Kirby G5 Service Manual

SECTION 4 -120 VT
4.5

High Potential Test of Finished Units

Purpose:
The high potential test is one method
of checking the electrical insulation
characteristics of finished units. A high
voltage potential is provided from the
internal wiring of the cleaner and the
exposed metallic case of the cleaner.
Current that passes from the live inter­
nal wiring to the case is measured, and
if the current is above a specified trip
value, a fail indication is given by the
test instrument. A pass reading indi­
cates that the insulation is limiting the
current to a safe value.
The high potential test might be per­
formed on a cleaner in the shipping box
or on the test table but if the cover is re­
moved for any reason. the high potential
test should be done after the unit is as­
sembled and prepared for the customer.
The following procedure should be used
to high potential test the finished units.
1. Record the following information:
a. date
b. location
c. signature of the person making the
check
d. serial number of the cleaner being
checked
e. special comments regarding the
particular test conditions or reasons
f. results of check (to be recorded later
in the procedure)
TROUBLESHOOTING
2. To perform the high potential test the
3. With the cleaner in the on mode, the
4. NOTE: The Generation Series cleaners
5. The test voltage should remain on for 60
6. Record the results and turn the high po­
29
cleaner must be in the on condition.
There must be an accessory in the
front mounting (like a nozzle) and an
accessory on the side exhaust port (like
a dust bag) for the cleaner to be on.
One way to ensure the cleaner i s on is
to run the cleaner, and while running,
pull out the plug.
plug removed from the wall outlet, and
the high potential tester off, attach one
of the probes from the high potential
tester to the cord prongs and the other
probe to the exposed metal surface of
the cleaner. The cleaner should pass
with either cord prong or both prongs
connected to the test probe.
contain a circuit board with some ele­
ments that can be damaged by the sud­
den application of high voltage. When
the high voltage for this test is applied,
the voltage should be at zero volts in­
itially, and then brought up to the test
voltage in approximately three seconds.
seconds, and there should be no indica­
tion of a failure. The present standards
indicate that the test voltage should be
3750 VAC.
tential tester down to zero voltage for
the unit.
next test
Issued 1 /97