PS Magazine - TB 43-PS-743
PS, The Preventative Maintenance Monthly
ISSUE 743
OCTOBER 2014
48
PS 743
OCT 14
± If± a±
Fault 234: Overspeed Shutdown
±
code±shows±up±on±the±generator’s±digital±
control± system± (DCS)± screen,± take± the±
CORRECTIVE±ACTION±found±in±WP±0010±
of±TM±9-6115-750-10±(Feb±11):
± ±
STEP 1.
±
Push FAULT RESET switch to
clear fault on DCS display.
± ±
STEP 2.
±
Turn engine control switch
to START position.
± ±
STEP 3.
±
If [Fault 234: Overspeed
Shutdown] reappears,
notify field maintenance.
± Usually,±three±startup±attempts±are±enough±to±warm±the±engine±for±starting.±If±you±have±
a±winterization±kit±attached±to±the±generator,±you±may±want±to±start±the±kit±before±starting±
the±generator.
± The±manufacturer±has±gotten±rid±of±the±
faulty± governor± actuator± from± AMMPS±
production± and± replaced± it± with± a± new±
actuator,± NSN± 2910-01-595-5200,± that±
should± prevent± overspeed± shutdowns.±
Actuator± replacement± instructions± are±
found±in±WP±0069-10±of±TM±9-6115-750-
24&P±(Dec±11).
Fault 234: Overspeed Shutdown
Genset Mode: Emergency Stop
Configuration: 10 kW, 3-Phase, 120/208 V, 60 Hz
Contactor
Open
8.0
Hours
2014-03-04
15:21:30
Power
Genset Voltage L-L
L1-L2
L2-L3
L3-L1
L-N
L-L
Adjustments
About
Maintenance
11.0
0.0
Switchbox
Open
0.0
kW
0
Mode
Unit
Battleshort
Inactive
Warning 1992: High Speed Warning
0
0
Vac
Freq
66
54
270
0
Bus Voltage L-L
L1-L2
L2-L3
L3-L1
0
0
0
Vac
270
0
Genset Current
L1
L2
L3
0.0
0.0
0.0
Aac
51
0
60
100
0
40
10
+90
-90
+0
100
0
240
0
0.0
Hz
Fuel
38
%
Battery
24.3
Vdc
Battery
+0
Adc
Oil
0
PSI
Coolant
97°
F
Dear Master Sergeant,
Indeed I do.
Here are three
NSNs for
battery acid:
Generators…
Restart After Shutdown
c’mon!
I need
some battery
acid here!
I’m loOking!
I
can’t find
the NSN!!
1
5
15
Qty in
gallons
00-249-9354
00-843-1640
00-893-8138
NSN
6810-
Dear Master Sergeant Half-Mast,
We have several dry 12V storage
batteries in dire need of battery acid.
Do you have the NSNs?
MSG M.K.
To±replace±actuator,±follow±TM±instructions
If±Overspeed±Shutdown±occurs,±restart±generator
Some 10-kW advanced medium
mobile power system (AMMPS)
generators are showing a
Fault 234: Overspeed Shutdown
code during startup.
The overspeed
shutdown
occurs when the
engine speed
goes 10 percent
beyond its
rated speed.
in this case,
the greater
engine speed
is caused
by a
faulty
governor
actuator.
The shutdown
happens
when the air
temperature
is between
21°F and 41°F.
darnit!
I
went to
overspeed
at startup
and then
shut down!
guess
I’m
outta
the
running!
don’t
worry.
a new
governor
actuator
will have
you chugging
along in no
time!
743 48-49.indd
1-2
8/25/14
12:17 PM
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