GAC ESD5526 Manuale di avvio rapido - Pagina 7
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13
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 through 4.
Positive (+) and negative (-) refer to meter polarity. Should normal values be indicated during troubleshooting steps, and then the fault may be
with the actuator or the wiring to the actuator. Tests are performed with battery power on and the engine off, except where noted. See actuator
publication for testing procedure on the actuator.
SYSTem InoPeraTIve
STeP
WIreS
normaL reaDInG
Battery Supply
1
F(+) & E(-)
(12 or 24 V DC)
1.0 V AC RMS min.
2
C(+) & D(-)
while cranking
10 V DC, Internal
3
P(+) & G(-)
1.0 - 2.0 V DC while
4
F(+) & A(-)
InSTaBILITY
InSTaBILITY
SYmPTom
The engine seems to jitter
Fast Periodic
with a 3Hz or faster
irregularity of speed
An irregularity of speed
Slow Periodic
below 3 Hz
Non-Periodic
Erratic engine behavior
•
DC battery power not connected. Check for blown fuse, switch off power.
Voltage
•
Low battery voltage
•
Wiring error
•
Gap between speed sensor and gear teeth too great. Check Gap.
•
Improper or defective wiring to the speed sensor. Resistance between Terminals D & C should be 160 to
1200 Ω. See specific mag pickup data for resistance.
•
Defective speed sensor.
•
Short on Terminal P
Supply
•
Defective speed control unit
•
Speed parameter set too low
•
Short/open in actuator wiring
cranking
•
Defective speed control
•
Defective actuator, see Actuator Troubleshooting
•
Make sure switch 1 Lead Circuit is set OFF.
•
Readjust the Gain and Stability for optimum control.
•
Turn off other electrical equipment that may be causing interference.
•
Turn switch 5 Dither on/off.
•
Readjust the Gain and Stability
•
Adjust the Dead Time Comp by setting switch 4 to ON.
•
Check fuel system linkage during engine operation for:
•
binding
•
high friction
•
poor linkage
•
Turn switch 5 Dither on/off.
•
Increasing the Gain should reduce the instability but not totally correct it.
•
If this is the case, there is most likely a problem with the engine itself.
•
Check for:
•
engine mis-firings
•
erratic fuel system
•
load changes on the generator set
•
voltage regulator
•
If throttle is slightly erratic, but performance is fast, then move switch 1 Lead Circuit to the OFF position.
•
Turn switch 5 Dither on/off.
ProBaBLe caUSe of
aBnormaL reaDInG
ProBaBLe caUSe of aBnormaL reaDInG
ESD5500-II Fusion Series Speed Control Unit 1-2020-A4
7
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