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Controller is inoper-
able, but no major
CPU faults are
detected (PC Run
LED is on)
Defective I/O devices or
I/O wiring.
Test inputs and outputs, according to the
I/O Troubleshooting section.
CPU Fault (CPU
Fault LED is blinking)
CPU Memory Error.
Cycle power.
Faulty memory module.
Remove power, then remove memory
module from the processor. Re-install the
processor and re-apply power to the
power supply. If the CPU Fault LED
changes to flashing, replace the existing
memory module.
Faulty processor or
power supply.
Place the processor in another chassis
and cycle power. If a steady CPU Fault
LED re-appears, replace the processor. If
CPU Fault LED clears, monitor the line
power to the power supply in the existing
system. Replace the power supply if the
line power checks OK.
Processor memory mod-
ule installed incorrectly.
If upgrading the processor ladder, verify
that the logic chip is properly seated.
SLC ladder logic and
weld processor firmware
are incompatible.
Verify compatibility; correct as necessary.
If not known, contact your WTC
representative for assistance.
One or more cards in
rack is not properly
seated or positioned.
Verify card position using control con-figu-
ration sticker (inside control door).
Remove power and re-seat module.
jumper settings on the
RIO card specify the
incorrect RIO rack size.
Verify that the RIO rack size and jumper
positions are correct. (See “Selecting the
Rack Size” on page 2-4 for the correct
jumper positions for each size of card
rack.)
The SLC processor
will not retain a
program when it is
loaded. (CPU Fault
LED is blinking)
Excessive draw on the
+24 VDC power supply.
Check for incorrect or shorted I/O wiring.
CPU error with Low/
no battery backup
(CPU Fault LED
flashing and Battery
Low LED is on)
Loss of RAM during
power-down period.
Verify that battery on the SLC processor is
connected.
Replace battery.
Symptom
Probable Cause
Corrective Action
Содержание MedWeld 3005
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