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16
EA200A
SECTION 10 : TROUBLE SHOOTING
SYMPTOM
POSSIBLE CAUSES
SOLUTIONS
Voltage cannot
build up
Residual voltage below 5 Vac
1) Check if B+ and B- have 24Vdc power input
2) Check whether the wiring of the oil pressure switch is normal
3) Check whether the FLASH switch is at correct position
4) Set FLASH switch to Manual excitation to build up the voltage
F+ and F- reverse connection
Interchange the wiring of F+ and F-
Engine under speed
Increase engine speed to above 25 Hz
Carbon brushes were worn out
Replace with new carbon brushes
AVR heat sink is over
temperature
1) Make sure the installation environment has good ventilation
2) Check whether the fan operates normally (when generator is
running and output voltage is normal)
External emergency stop
terminals closed
Open external emergency stop terminals
Voltage output
is too low
Incorrect voltage selection for
sensing power transformer
Select the correct voltage setting for sensing power transformer
Under Frequency Protection is
activated
Select the correct system frequency or increase the generator
frequency to the rated speed
Voltage set point of EA45AF is
too low
Adjust the VOLT knob clockwise to make the voltage reach rated
value
External voltage adjustment set
point is too low
Adjust the external voltage knob to middle position
The external voltage adjustment
knob is abnormal
Replace the external voltage adjustment knob.
Incorrect setting for Half Wave /
Full Wave output.
Select the correct output voltage (Full Wave must be selected
when excitation voltage in full-load is greater than 60Vdc)
AVR heat sink is over
temperature
1) Make sure the installation environment has good ventilation
2) Check whether the fan operates normally (when it can
generate power normally)
External emergency stop
terminals closed
Open External emergency stop terminals
Voltage output
is too high
Incorrect voltage selection for
sensing power transformer
Select the correct voltage setting for sensing power transformer
Voltage set point of EA45AF is
too high
Adjust the VOLT knob counterclockwise to make the voltage
reach rated value
Voltage output
is unstable
(Hunting)
Stability set point is not match
Generator properly
Please refer to chapter 5.2.1 for Stability adjustment
Under Frequency Protection is
activated
The setting value of Under Frequency Protection is too close to
the knee point.
Please refer to chapter 5.2.2 for Under Frequency adjustment
Incorrect setting for Half Wave /
Full Wave output.
Select the correct output voltage (Half Wave must be selected
when excitation voltage in full-load is lower than 30Vdc)
Field resistance or field voltage
is too low. (Excitation voltage is
lower than 5Vdc when No-load)
Connect suitable resistor in series to increase total resistance
Cooling Fan is
no action
Incorrect voltage selection on
FAN VOLT transformer
Select correct Fan voltage on FAN VOLT transformer
The fan is stuck
Clean or replace the fan
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