Woodward GECO, Техническое руководство, Страница: 81 / 90

Manual 03554 GECO

Stoichiometric
Woodward 73
Symptoms Without Indicated Faults
No Hand-Held Display
Unplug and replug-in hand-held cable [SEE
WARNING BELOW]
Check circuit board LED for power supply,
check power fuse
Check hand-held cable
Hand-held programmer Circuit board
Strange Hand-Held Display:
Power-on setup mode (see Operation section,
hand-held programmer)
Unplug and replug-in hand-held cable [SEE
WARNING BELOW]
High Emissions:
Exhaust air leak–causes EGO signal errors
Ignition timing
Ignition system components
EGO target calibration–recalibrate Installation
section guidelines
EXPLOSION HAZARD—The GECO enclosure should not be opened
when a hazardous atmosphere is present. Wiring connections which
could cause sparks are available inside the cabinet.
Do not disconnect while circuit is live unless area is known to be
non-hazardous.
The GECO control must not be operated with the hand held terminal
connected to the control when a hazardous atmosphere is present.
RPM Signal Issues
The control will follow several different control strategies depending on the
engine speed signal. If the control is not receiving proper speed signals, or if the
“pulses/rev” setting is not correct, the GECO
 Stoichiometric control may default
to an incorrect operating condition.
There are three main operating conditions based on engine speed:

Stopped–below 15 rpm–fuel metering valves closed

Cranking–from 20 to 190 rpm–fuel metering valves cranking (usually 35%)

Running–above 190 rpm–open loop default (usually 35%), closed loop or
closed loop+adaptive when possible (after warm-up, good signals, no faults
causing open loop)

When using a switched run signal rather than MPU or G-lead input, the
operating condition switches from stopped to running as described above.
The cranking condition is skipped over. Any rpm values displayed by the PC
software or hand-held terminal will show a 1350 rpm default value when the
switched run signal is on
Recommended Spare Parts
WGC P/N Description Quantity
6910-315 EGO Sensor 2
6910-316 HEGO Sensor 1
1736-919 EGT Sensor (K-type TC) 2
1310-923 Fuel Metering Valve 1