System Troubleshooting; System Inoperative; Unsatisfactory Performance - KIRLOSKAR DV Series O & M Manual

4.8.4

SYSTEM TROUBLESHOOTING

SYSTEM INOPERATIVE

If the engine governing system does not function, the fault may be determined by performing the voltage
tests described in Steps 1,2,3, and 4. (+) and (-) refer to meter polarity. Should normal values be indicated
as a result of following the trouble shooting steps, the fault may be with the actuator or the wiring to the
actuator. See the actuator publication for testing details.
STEP TERMINALS NORMAL READING
1. F(+) & E(-)
2. C&D
3. P(+) & G(-)
4. F(+) & A(-)

UNSATISFACTORY PERFORMANCE

If the governing system functions poorly, perform the following tests.
SYMPTOM
Engine overspeeds 1. Do not crank. Apply DC power to
Battery Supply Voltage
(12 or 24 VDC)
1.0 VAC RMS min.,
while cranking
10 VDC, Internal Supply 1. Short on terminal P. (This will cause a defective unit.)
1.0 - 2.0 VDC while
cranking
TEST
governor system
speed sensor at Terminals C&D.
2. Manually hold the engine at the
desired running speed. Measure the
DC voltage between Terminals A (-)
& F(+) on the speed control unit.
PROBABLE CAUSE OF ABNORMAL READING
1. DC battery power not connected. Check for blown
fuse.
2. Low battery voltage.
3. Wiring error.
1. Gap between speed sensor and gear teeth too
great. Check gap.
2. Improper or defective wiring to the speed sensor.
Resistance between terminals C and D should be
30 to 1200ohms.
3. Defective speed sensor.
2. Defective Speed Control.
1. SPEED adjustment set too low.
2. Short/open in actuator wiring.
3. Defective speed control.
4. Defective actuator. See Actuator Troubleshooting.
PROBABLE FAULT
1. Actuator goes to full fuel. Then,
disconnect sensor at Terminals A (-) &
If actuator still at full fuel - speed control
unit defective. If actuator at minimum fuel
position - erroneous speed signal. Check
speed sensor data.
1. If the voltage reading is 1.0 to 2.0 VDC,
a) SPEED adjustment set above
desired speed.
b) Defective speed control unit.
2. If the voltage reading is above 2.0 VDC,
a) Actuator or linkage binding.
3. If the voltage reading is below 1.0 VDC,
a) Defective speed control unit.
4. Gain set too low.
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