T-375
4–6
4.4 Electronic Governor Module
4.5 Voltage Controller
The voltage controller has one green indicator light and one yellow indicator light. When the green light is illumi
-
nated, it means that the voltage controller is receiving power. During normal operations the yellow light is continu
-
ously blinking at a one Hz rate. If there is a problem then the yellow light will blink at various rates depending upon
the fault. Refer to the chart below to determine the fault.
4.6 High Voltage Circuit
Electrical troubleshooting for high voltage control circuit
WARNING
!
Before proceeding with the troubleshooting, make sure to follow your company’s standard
safety procedures for working with electrical components.
Table 4–9 Electronic Governor Modules
Fault
LED flash code
Possible Cause
Engine Over Speed: more than
2,530 RPM
One Long–One Short
ESS or mechanical engine problem
Actuator Wiring Disconnection.
No signal from ESS for 2 seconds
after RPM is greater than 1,000
RPM for 10 seconds, OR for 5
seconds while engine cranking
(no voltage at EG pin 18).
Two Long–One Short
Short ESS or wiring problem
Speed Sensor Disconnection.
Fuel/speed actuator (FS) wiring
disconnected or open circuit. Coil
Resistance Spec: 2.8 ohm +/-
10%.
Two Long–Three Short
FS or wiring problem
EG supply voltage is greater than
26V.
Two Long–Seven Short
EG or alternator problem
Table 4–10 Voltage Controller
Green LED
Fault
Possible Cause / Remedy
LED not illuminated
No power to the voltage controller
Contactor failed
Check line side power on
contactors
Yellow LED flash Code
Fault
Possible Cause / Remedy
One Long–Three Short
Over Voltage Error
Engine speed, check
One Long–Four Short
Under Voltage Error
Engine speed, check
Summary of Contents for 69UG15
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