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 ELECTRIC PROTECTIVE SYSTEM
TROUBLESHOOTING
PROCEDURE D
5N1955 ELECTRONIC SPEED SWITCH
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).
stay on until the reset button is pushed after an
OVERSPEED VERIFY TEST
overspeed switch shutdown. To restart the engine,
push in reset button (2) for a moment. This will reset the
1.
Run the engine at rated speed and push verify
speed switch, and the "LED" overspeed light (3) will go
button (1) in for a moment. This will cause the
off. The air inlet shutoff lever must now be manually
speed switch to activate and shutdown the
reset before the engine can be started.
engine.
NOTE C:
To verify overspeed shutdown system
NOTE: Any time the engine speed is 75% or more of the
operation, push in the VERIFY button for a moment. The
overspeed setting, the engine will shutdown if the verify
engine must shutdown at 75% or more of overspeed
button is pushed.
setting.
EXAMPLE: For an engine with a rated speed of 1800
NOTE D: Input Voltage: Maximum 40 VDC; Minimum 8
rpm, the overspeed setting is 2125 rpm (see SPEED
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.
The "LED" overspeed light (3) will come on and
SPEED SPECIFICATION CHART (RPM)
TYPICAL RATED
OVERSPEED
75% OVERSPEED
OIL STEP SPEED
CRANK TERMINATE
SETTING (25) NOTE
VERIFY (25) NOTE
ENGINE SPEED
SETTING
E
C
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
499
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