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 ELECTRIC PROTECTIVE SYSTEM
TROUBLESHOOTING
PROCEDURE D
4W2218 ELECTRONIC SPEED SWITCH (ESS)
1. Verify button. 2. Reset button. 3. "LED" overspeed light. 4. Seal screw plug (overspeed). 5. Seal screw
plug (crank terminate). 6. Seal screw plug (oil step).
The "LED" overspeed light (3) will come on and
OVERSPEED VERIFY TEST
stay on until the reset button is pushed after an
1. Run the engine at rated speed and push
overspeed switch shutdown. To restart the engine,
verify button (l) in for a moment. This will
push in reset button (2) for a moment. This will reset the
cause the speed switch to activate and
speed switch, and the "LED" overspeed light (3) will go
shutdown the engine.
off. The air inlet shutoff lever must now be manually
reset before the engine can be started.
NOTE: Any time the engine speed is 75% or more of the
overspeed setting, the engine will shutdown if the verify
NOTE C: To verify overspeed shutdown system
button is pushed.
operation, push in the VERIFY button for a moment. The
engine must shutdown at 75% or more of overspeed
EXAMPLE: For an engine with a rated speed of 1800
setting.
rpm, the overspeed setting is 2125 rpm (see SPEED
NOTE D: Input Voltage: Maximum 40 VDC; Minimum 8
SPECIFICATION CHART and Note E). The overspeed
VDC.
verify test will shutdown the engine at 75% (+ 25 rpm) of
NOTE E: The engine overspeed setting rpm is 118% of
the overspeed setting of 2125 rpm. In this example, 75%
rated engine rpm.
of 2125 rpm is approximately 1600 rpm. If the verify
button is pushed at an engine speed of approximately
1600 rpm or above, the engine will shutdown.
SPEED SPECIFICATION CHART (RPM)
OVERSPEED
75% OVERSPEED
TYPICAL RATED SETTING (25)
VERIFY ( + 25)
OIL STEP
CRANK
ENGINE SPEED
NOTE E
NOTE C
SPEED SETTING
TERMINATE
1800
2125
1600
1125
600
1600
1890
1415
1125
600
1500
1775
1325
1125
600
1300
1535
1150
750
400
1200
1415
1060
750
400
1000
1180
885
750
400
900
1065
800
750
400
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