Chapter 6. Hardware/Operating System Faults; General - Woodward 505 Installation And Operation Manual

Manual 85017V2
Hardware/Operating System Faults
WARNING
Explosion hazard–Do not connect or disconnect while circuit is live unless
area is known to be non-hazardous.
AVERTISSEMENT
Risque d'explosion–Ne pas raccorder ni débrancher tant que l'installation
est sous tension, sauf en cas l'ambiance est décidément non dangereuse.
Most 505 problems which will be encountered are covered in the manual. Use
the table of contents to locate the sections of the manual that may describe a
specific problem. Refer to the CONTROLLING PARAM DISPLAYS and ALARM
DISPLAYS sections of this manual for display descriptions and corrective
actions. This troubleshooting section contains a few guidelines that Woodward
field service technicians and engineers have suggested.
Off-line Diagnostics
When the 505 control is powered up the microprocessor and other hardware is
reset and the self-test begins. The first thing that the self-test does is turn off all
five of the LED lamps. If these LEDs do not turn off this means that the
microprocessor is not working and that the CPU module has failed. The self-test
tests the RAM, system clock, LED display, EEPROM, communications memory,
and application memory before beginning execution of the application program. If
an error is found during the self-test it is annunciated on the front panel LED
display. It also indicates the error by flashing the F1/Alarm LED a certain number
of times repetitively for errors when the LED display may not be functioning. The
table below shows the errors indicated by flashing LEDs:
LED Flashes
1
2
3
4
5
6
7
It is also possible to see the errors below on the front panel LED display. These
errors could occur at anytime during the self-test or during execution of the
application program. These indicate that an illegal reset condition has occurred.
Woodward
Chapter 6.

General

General
Error
RAM Test Failed
Unexpected Exception
Clock Interrupt Test Failed
Display Test Failed
EEPROM Test Failed
Communications Memory Test Failed
Flash Memory Test Failed
505 Digital Governor
103