Rockwell Automation SA3100 Fiber-Optic Cabling-Distributed Pwr System - Manual (Page 22)

4-2 Fiber-Optic Cabling
If the COMM OK LED remains off, remove the test cable and replace the
UDC module.
If the UDC module’s COMM OK LED lights, turn the loop-back test off by
setting bit 15 of registers 101 or 1101 to zero. Then remove the test cable
and go to step 3.
Step 3. To test the original cable using the UDC module’s fiber-optic transmitter,
re-connect the original fiber-optic cable to the UDC module’s ports. Instead of
connecting the other end of the fiber-optic cable to the PMI’s XMT and RCV
ports, connect the cables together using a fiber-optic coupler (P/N
417135-2A).
Use the AutoMax Programming Executive’s I/O Monitor to initiate the
loop-back test by setting bit 15 of register 101 (drive A) or register 1101
(drive B).
If the UDC module’s COMM OK LED remains off, try replacing the fiber-optic
connectors. Re-initiate the loop-back test again. If the COMM OK LED
remains off, replace the fiber-optic cable. Re-initiate the loop-back test. If the
UDC module’s COMM OK LED does light, turn the loop-back test off by
setting bit 15 of registers 101 or 1101 to zero, and go to step 4.
Step 4. To test the cable using the PMI’s fiber-optic transmitter, re-connect the
fiber-optic cable to the PMI’s ports. Instead of connecting the other end of the
fiber-optic cable to the UDC module’s XMT and RCV ports, connect the
cables together using a fiber-optic coupler (P/N 417135-2A). Cycle power to
the PMI.
If the PMI’s COMM OK LED remains off, reconnect the original fiber-optic
cable to the UDC module’s ports and re-initialize the AutoMax rack(s). Cycle
power to the PMI. If the COMM OK LEDs still do not light, systematically
replace the PMI, the UDC module, and the fiber-optic cable.
4.2 DRV FLT LEDs
The red DRV FLT LEDs on the UDC module are normally off. If the LEDs are on,
check the status of bit 15 of register 202 (drive A) and register 1202 (drive B). If bit 15
is equal to one, the drive fault was caused by a fiber-optic communication problem.
Continue with the troubleshooting procedures in section 4.1.