Winco MD6L - Manual (Page 11)

PAGE 9 60706-121
hottest areas on the equipment. Heat applications
should be continuous. Interruption of the heating
operation to the extent that the equipment cools and
approaches ambient temperature, may allow moisture
to condense in the insulation and retard the drying
process. Drying cannot be hurried. Many hours, or even
days, may be required to achieve satisfactory results.
5. Revarnishing insulation - In some cases, after
long periods of operation, or if repeated cleaning and
drying has been necessary, the results of insulation
resistance tests may indicate that revarnishing of
insulation is necessary. However, the application of
varnish will not permanently increase the insulation
resistance or dielectric strength of the insulating
material and should not be done in lieu of repairing
defective insulation.
TROUBLESHOOTING
A. General - Check for loose wires, connections, and
hardware whenever the engine or generator control
panels are opened. If the troubleshooting chart indi-
cates a particular component discrepancy, proceed to
that portion of the test procedure.
To properly check out electronic components and
generator wiring, they must be isolated from associated
circuitry. Always mark leads disconnected to insure
correct reconnection after testing.
Test equipment required to accomplish the static and
operational tests:
1. Volt-ohmmeter - 20,000 ohms per volt (or
higher).
2. Frequency meter - 58 to 62 hertz (cycles per
second).
3. Clamp-on ammeter 0-600 ampere range.
B. Problem isolation - Malfunctions are generally
classified and described by symptoms, with the
symptoms pointing to causes.
Start failure, poor speed regulation, high voltage, low
voltage, etc., are only SYMPTOMS. To find and correct
CAUSES of these malfunctions, it is necessary to
isolate the problem to one of the basic system compo-
nents.
1. Engine - including fuel and cranking systems.
2. Generator - including excitation capacitors,
winding, and rectifiers.
3. Control panel - switches and wiring
4. Light tower - lamps, ballasts, or wiring
5. Other external influences - such as load, fuel,
battery, accessory equipment (remote control panels,
exhaust system, etc).
C. Eliminate external causes of malfunction
1. Installation - restrictions in exhaust, ventilation,
fuel, low battery etc.
2. Load - two basic checks regarding apparent
overload.
a. Verify load is within nameplate capacity
using a clamp-on ammeter.
b. If within nameplate capacity on all legs,
determine if speed drops below specifications.
1. If speed drops, engine/fuel etc.,
problem.
a. Fuel filters plugged.
b. Tank empty.
c. Water in system.
d. Lines broken or disconnected.
e. Air filter plugged
2. If speed is OK, there is a genera
tor/electrical problem.
Efficient troubleshooting will rapidly narrow the number
of possible causes of malfunction with the minimum of
checks. To do this, a general understanding of the total
system operation is necessary. Each system compo-
nent has unique input and output characteristics that
provide clear messages that properly interpreted will
point directly to the cause of malfunction. Verify defect
and repair or replace as required.
For resolution of specific failure symptoms, isolate to
system or component and refer to section of this
manual covering the suspected system.