Winco PSS70000 - Manual (Page 13)

60706-124 Page 11 60541
NO AC OUTPUT FROM GENERATOR
1. Defective rectifier.
2. Defective surge suppressor.
3. Defective voltage regulator.
4. Defective rotor.
5. Defective stator.
6. Defective excitor rotor.
7. Defective excitor stator.
8. AC short in the output leads.
9. Defective field circuit breaker.
LP/NG FUEL ADJUSTMENTS
**** CAUTION ****
EQUIPMENT DAMAGE - Do not make any fuel adjustments or
governor adjustments until all pressure readings are in compli-
ance with specification. See fuel pressure charts (tables 1, 2,
and 3).
NATURAL GAS (NG)
Due to variations in NG fuel characteristics and BTU levels
throughout the country, it may be necessary to readjust the fuel
mixture once the engine has been installed and serviced.
**** CAUTION ****
EQUIPMENT DAMAGE - Never make a fuel mixture adjustment
on a unit when it is stopped or running no load. A mixture
adjustment is only effective when the engine is operating under
load.
Adjustment Procedure
1. Ensure the unit is operating under an 80 to 100% load or at
the highest anticipated load.
2. Attach a frequency meter to monitor Hz.
Note: On these unit the mixture adjustment is located on the
carburator just behind the fuel inlet hose. This mixture adjust-
ment is a partial turn, lean to rich, load block.
3. Begin making a mixture adjustment, observing the Hz
meter. If the meter begins to drop you have the mixture set too
lean. Adjust the valve in the opposite direction. Adjustments
should be made very slowly. Adjust back and forth until the
highest Hz is achieved. Do not turn the valve richer after the Hz
quits rising. This would cause the engine to run rich. If the Hz is
out of upper or lower limits, a governor adjustment will be
necessary.
4. See your engine manual for governor adjustment proce-
dures.
**** CAUTION ****
EQUIPMENT DAMAGE - Under full load do not adjust the Hz
above 60. If a higher Hz reading is used, as the load is de-
creased the Hz will go out of upper limits (61 to 62 Hz).
PROPANE (LP)
A generator set factory tested on LP will normally require no
adjustment. If for some unforeseen reason the machine should
require adjustment, follow the above procedure.
FUEL TYPE CONVERSION
If it should be necessary to change the type of fuel used after a
unit is received, the following procedures are provided.
NOTE: For conversion to/from liquid withdrawal LP consult the
factory. Additional parts will be required for this conversion.
NATURAL GAS TO PROPANE VAPOR
1. Turn off fuel supply.
2. Remove the fuel line from the carburetor at the demand
regulator.
3. Remove the cap on the upright column of the regulator. This
will expose the pressure spring adjusting screw. Back off the
spring adjusting screw so there is just enough room to replace
the cover. Replace the cover.
4. Invert the regulator so it is positioned with the column
pointing down.
5. Reconnect the fuel line at the regulator.
6. Remove the 1/8 NPT plug (the one closest to fuel solenoid)
located on what is now the top of the regulator. Connect a fuel
pressure meter or a monometer where the plug has been
removed. Move the generator control switch to the run position.
As the unit starts to crank the fuel solenoid will open and you
should get a pressure reading of between 4 to 6 ounces (7 to 11
inches of water column).
7. If the pressure is correct, remove the meter and reinstall the
pipe plug.
8. You are now ready to make the final fuel mixture adjustment.
Refer to adjustment section in this manual.