Manual 85586V1
AtlasPC Digital Control, Vol. I
Woodward
73
Number of LED Flashes
Failure
1
Microprocessor
failure
2
Bus, address, any unexpected exception error
5
Failure during EE test or erasing
7
Kernel software Watchdog count error
12
Failure during CPU Internal RAM test
13
Dual port RAM error
Table 7-1 Analog Combo Failure
Fault Detection (I/O)
In addition to detecting board hardware faults, the application program may
detect I/O faults.
•
Analog Input Faults—The application software may set a high and low latch
set point to detect input faults. For thermocouple inputs, open wire detection
is provided.
•
Speed Sensor Input Faults—The application software may set a high and
low latch set point to detect input faults.
•
Microcontroller Faults—The system monitors a software watchdog, a
hardware watchdog, and a software watchdog on the PC/104 bus
communications. All outputs are shutdown in the event of a microcontroller
fault.
Troubleshooting Guide
Speed Sensor Inputs
If a magnetic pickup input is not functioning properly, verify the following:
•
Check that the cable is shielded and the shield is properly grounded per the
shields and grounding section in Chapter 2.
•
Measure the input voltage on the terminal block. It should be greater than
that shown in Figure 7-3.
•
Verify that the signal waveform is clean and void of double zero crossings.
•
Verify that no ground connection exists and that the resulting 60 Hz signal is
absent.
•
Measure the frequency. Frequency should be in the range of 100 Hz - 25
kHz.
•
Check the wiring. Look for a loose connection at the terminal blocks and
disconnected or misconnected cables.
•
Check the software configuration to ensure that the input is configured
properly; check the hertz to rpm ratio, and the maximum speed.
After verifying all of the above, the AtlasPC should be returned for service.
Summary of Contents for AtlasPC
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