Woodward 2301E, Инструкция по установке и эксплуатации, Страница: 140 / 182

2301E Digital Control Manual 26641
130 Woodward
Chapter 7.
Troubleshooting
Introduction
The following troubleshooting guide is an aid in isolating trouble to the control
box, actuator, plant wiring, or elsewhere. Troubleshooting beyond this level is
recommended ONLY when a complete facility for control testing is available.
The control can be damaged with the wrong voltage. When replacing
a control, check the power supply, battery, etc., for the correct
voltage.
Troubleshooting Procedure
This chapter is a general guide for isolating system problems. The guide
assumes that the system wiring, soldering connections, switch and relay
contacts, and input and output connections are correct and in good working
order. Make the checks in the order indicated. Various system checks assume
that the prior checks have been properly done.
Be prepared to make an emergency shutdown when starting the
engine, turbine, or other type of prime mover, to protect against
runaway or overspeed with possible personal injury, loss of life, or
property damage.
Control Start-up
When the control is powered on, the CPU begins execution of a section of the
software program known as the boot code. This code performs hardware
diagnostics and checks that a valid application program has been installed.
During this period all control outputs will remain disabled. The boot code takes
approximately 1.5 seconds to execute. During this period the red status LED
should be red. When execution of the boot code has completed, control will be
transferred to the application program. When the application program begins, the
control outputs will be enabled and system control will begin. At that point the red
status LED will be turned green and should remain on as long as the control is
running.
If the control fails its self-test diagnostics during boot, fails its on-line self-tests
while running the application program, or fails in any other way that it can detect,
then the CPU will blink the red status LED to indicate the failure. If the CPU LED
is blinking, the unit has failed and needs to be returned.
To prevent damage to the prime mover, the prime mover must be
shut down for all system checks.