Chapter 7. Troubleshooting; Control Hardware And I/O - Woodward EGCP-2 Operation Manual

Manual 26086
Problem
Unit does not power up
Unit powers up and then
cycles on and off when
cranking
Discrete inputs don't show
active in I/O STATUS
screen when switches are
activated
Displayed generator
voltages are very small
I/O STATUS shows relay(s)
is energized, but action(i.e.
alarm) does not occur
Generator voltage
fluctuates or is unstable at
no load on generator
Voltages or currents
displayed by EGCP-2 are
different than measured
parameter
Woodward
EGCP-2 Engine Generator Control Package
Chapter 7.
Troubleshooting

Control Hardware and I/O

Probable Cause
No input power supply
Input power supply reversed
Weak Engine Battery or
Engine Battery voltage
dropping below 6 Vdc on
cranking
Faulty wiring of discrete
input switches
Faulty wiring of generator
Potential
Transformers(PT's)
Generator PT inputs are
improperly calibrated
Faulty wiring of relay output
contacts
AVR dynamics are
improperly set up
EGCP-2 PT inputs are
inaccurately calibrated
Corrective Action
Check input power supply
on terminals 1 and 2. This
input must be 9 to 32 Vdc.
Ensure proper polarity of
power supply to EGCP-2.
Charge Engine Battery, or
Replace Engine Battery.
Verify wiring of discrete
input switches.
Verify wiring of generator
Potential Transformers
(PTs).
Calibrate the appropriate
PT input channel(s). See
section 1.10 Calibration of
Control Inputs and Outputs.
Verify wiring of relay output
contacts.
Tune the AVR dynamics for
stable operation. See AVR
manufacturer's instruction
manual for more details.
Calibrate the appropriate
PT input channel(s). See
section 1.10 Calibration of
Control Inputs and Outputs.
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