ELECTRIC SHUTOFF SYSTEM
TROUBLESHOOTING
PROCEDURE D
OVERSPEED VERIFY TEST
1.
Run engine at rated speed, push verify button (
11 ) in for a moment. This will cause the speed
switch to activate and shutdown the engine.
NOTE: Any time the engine speed is 75% or more of the
overspeed setting, the engine will shutdown if the verify
button is pushed.
EXAMPLE: For an engine with a rated speed of 1500
rpm the overspeed setting is 1770 rpm. The over-
speed verify test will shut down the engine at 75% of the
overspeed setting of 1770 rpm. In this example 75% of
1770 rpm is 1328 rpm. If the verify button is pushed at
an engine speed of 1328 rpm or above the engine will
shutdown.
The "LED" overspeed light (13) will come on and stay on
until the reset button is pushed after an overspeed switch
shutdown. To restart the engine, push in reset button
(12) for a moment. This will reset the speed switch and
the rack shutoff solenoid. The "LED" overspeed light (
13) will go off. The air inlet shutoff must be manually
reset.
SPEED SPECIFICATION CHART
CRANKING
OVERSPEED SETTING
75% OVERSPEED (VERIFY
TERMINATION SETTING
ENGINE
NO. OF TEETH
TYPICAL
ENGINE
MAGNETIC
ENGINE
MAGNETIC
ENGIN
E
MAGNETIC
MODEL
ON RING GEAR
RATED
SPEED
PICKUP
SPEED
PICKUP
SPEED
PICKUP
ENGINE
(RPM)
FREQUENCY
(RPM)
FREQUENCY
(RPM)
FREQUENCY
SPEED
NOTE E
(HZ) NOTE F
NOTE C&E
(HZ)
(HZ) NOTE F
(RPM)
NOTE C & F
1800
2124
4673 + 25
1593
3505 + 25
3304
132
600
1320 + 25
1500
1770
3894 + 25
1328
2921 + 25
and
1800
2124
5522 + 25
1593
4142 + 25
3306
156
600
1560+25
1500
1770
4602 ± 25
1328
3452 + 25
NOTE C: To verify overspeed shutdown system
operation, push in for a moment the verify push button.
The engine must shutdown at 75% or more of overspeed
setting.
NOTE D: Input Voltage: Maximum 37 VDC Minimum 8
VDC.
NOTE E: The engine overspeed setting rpm is 118% of
rated engine rpm.
NOTE F: The magnetic pickup frequency (HZ) at the
overspeed or cranking termination setting is calculated
with the formula that follows:
OVERSPEED
MAGNETIC
OR CRANKING
PICKUP
NO. OF TEETH
TERMINATION
FREQUENCY = ON RING GEAR X RPM SETTING
60
If the rated speed of the engine is other than shown
in the chart, the magnetic pickup frequency for the
overspeed setting can be found according to NOTES E
and F.
If a 2301 Governor is used, only one magnetic
pickup is needed. Use the magnetic pickup from the
overspeed group. Connect the wires from the magnetic
pickup to the overspeed switch and then connect wires
from the speed switch to the 2301 Governor. The
overspeed switch can be installed close to the 2301
Governor if needed.
To reset overspeed switch, push in reset button for a
moment.
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