Lincoln Electric VANTAGE 400 Service Manual page 79

F-31
ENGINE THROTTLE ADJUSTMENT TEST (CONTINUED)
L IN
C O
E L L N
E C
T R
IC
Frequency Counter Method
NOTE: A dedicated frequency counter can be
used for this test, but many high quality digital mul-
timeters also have this function, and can be easily
utilized. See the manufacturer instructions for your
frequency counter or multimeter.
1. Set your frequency counter per the meter man-
ufacturer instructions, and plug it into one of
the 120VAC auxiliary receptacles.
2. Start the engine and place the idle switch in the
"HIGH IDLE" position. Make sure that there is
no load on the machine.
The frequency should read between 62.0 and
63.0 Hz.
TROUBLESHOOTING & REPAIR
FIGURE F.5 - SOLENOID
VANTAGE® 400
SHUTDOWN SOLENOID
IDLE SOLENOID
HIGH SPEED ADJ.
3. Move the idle switch to the "AUTO IDLE" posi-
tion and wait for the idle solenoid to energize,
and the engine RPM to drop and stabilize at
the low idle RPM.
The frequency should read between 43.3 and
46.6 Hz.
If either of the readings is incorrect, proceed to
the THROTTLE ADJUSTMENT PROCE-
DURE later in this section.
NOTE: For the VANTAGE® 400, and any other
Lincoln Electric 1800 RPM (4 Pole) machine,
engine RPM can be determined by multiplying the
frequency, in Hz. By 30. (Example: 30 Hz * 62 =
1860RPM)
F-31
LOW SPEED ADJ.
DO NOT TOUCH
FOR LOW SPEED