Generac Power Systems 941-2 - Manual (Page 21)

Section 1.4
INSULATION RESISTANCE
Figure 3. Schematic - Stator Windings
USING SOLVENTS FOR CLEANING:
A solvent is generally required when dirt contains oil
or grease. Only petroleum distillates should be used
to clean electrical components. Recommended are
safety type petroleum solvents having a flash point
greater than 100° F. (38° C.).
Use a soft brush or cloth to apply the solvent. Use
care to avoid damaging magnet wire or winding insu-
lation. After cleaning, dry all components thoroughly
with moisture-free, low pressure compressed air.
DANGER! DO NOT WORK WITH SOLVENTS
IN ANY ENCLOSED AREA. ALWAYS PRO-
VIDE ADEQUATE VENTILATION. FIRE,
EXPLOSION OR OTHER HEALTH HAZARDS
MAY EXIST UNLESS ADEQUATE VENTILA-
TION IS PROVIDED. WEAR EYE PROTEC-
TION. WEAR RUBBER GLOVES TO PROTECT
THE HANDS.
CAUTION! Some generators use epoxy or
polyester base winding varnishes. Use sol-
vents that do not at tack such materials.
DRYING THE GENERATOR
GENERAL:
If testing indicates that the insulation resistance of a
winding Is below a safe value, the winding should be
dried before operating the unit Some recommended
drying methods include (a) heating units and (b)
forced air.
HEATING UNITS:
If drying is needed, the generator can be enclosed in
a covering. Heating units can then be installed to
raise the temperature about 15°-18° F. (8°-10° C.)
above ambient.
FORCED AIR:
Portable forced air heaters can be used to dry the
generator. Direct the heated air into the generator's
air intake openings. Run the unit at no-load. Air tem-
perature at the point of entry into the generator should
not exceed 150° F. (66° C.).
!
!
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