Rockwell Automation SA3100 Diag,Troublesht,Startup,Guide - Manual (Page 67)

Summary of UDC Module Drive Fault Indicators E-1
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PPENDIX
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Summary of UDC Module
Drive Fault Indicators
Status/Fault LEDs
CARD OK (green) - The CARD OK LED will turn on after the UDC module’s power-up
self tests have been successfully completed. The LED will remain on unless there is a
watchdog time-out or until power is cycled.
OS OK (green) - The OS (operating system) OK LED will turn on after the UDC
operating system is loaded into the module. It will remain on until power is cycled. On
subsequent power-ups, the LED will turn on to indicate that the OS is still resident in
the module. Note that this LED is also used to indicate any failure that may occur
during the power-up diagnostics. If the UDC module fails any of its power-up
diagnostics, the module must be replaced.
COMM A OK and COMM B OK (green) - The Communication Status LEDs will turn
on after the UDC module has established communication with the PMI rack(s) over
the fiber-optic link(s). COMM A indicates the status of communication link A. COMM
B indicates the status of communication link B. When an LED is lit, it indicates that
messages are being received over that channel. Each channel operates
independently of the other. If a channel is not being used, its LED will remain off. If
communication errors are detected in two consecutive messages, the COMM OK LED
will turn off and the DRV FLT LED will turn on. If the next message received by the
UDC module is correct, the COMM OK LED will turn back on. The Communication
Fault bit (register 202/1202, bit 15, FLT_COM@ ) will remain latched.
DRV FLT A and DRV FLT B (red) - The Drive Fault LEDs are normally off. If a Drive
Fault LED is lit, it indicates the a Drive Shutdown fault has been detected for the
indicated drive. When a drive fault is detected, a bit is set in register 202 for drive A or
register 1202 for drive B in the UDC module’s dual port memory. Bit 8 of the Drive
Status register (200/1200) is also set.