Rockwell Automation FlexPak 3000 DC Drive Version 4.3 - Manual (Page 63)

Troubleshooting/Diagnostics 4-3
4.5 Check the Regulator LED Status
Two LEDs on the Regulator board indicate the operating status of the Regulator
board. The cover on the OIM must be removed to observe these LEDs. Check these
LEDs when the OIM is not communicating with the regulator. Typically, there will be no
fault indication on the display when the OIM is not communicating with the Regulator
board. If a fault can be displayed, the fault would be OIM COMMUNICATIONS
TIMEOUT (F00011).
The two LEDS are labeled CPU OK and OIM COMM OK. CPU OK will be on
whenever the inputs and outputs are being scanned (I/O is not scanned during power-
up diagnostics and following certain faults). OIM COMM OK will be on whenever the
Regulator board and the OIM are communicating properly. The following table
summarizes the possible states of the two LED indicators.
CPU OK LED OIM COMM OK LED Indication(s) and Action(s)
Off Off • No power - verify that the drive power is on; check voltages at
the Regulator board.
• LED failure - cycle power and verify that both LEDs illuminate
briefly (lamp test).
• Power-up diagnostics failed - replace the Regulator board.
On • Combination not used.
Blink • Combination not used.
On Off • I/O is being scanned; the regulator is not communicating with
the OIM - check OIM cable; check voltages at the OIM.
On • I/O is being scanned; the regulator is communicating with the
OIM; no faults - this is the normal condition, no action is
required.
• I/O is being scanned; the regulator is communicating with the
OIM; diagnose/correct the fault condition and reset the fault
from the selected control source fault reset.
• Power-up diagnostics in progress (lamp test).
Blink • Combination not used.
Blink Off • I/O is not being scanned; the Regulator board is not
communicating with the OIM; check the OIM cable or cycle
power.
On • I/O is not being scanned; the Regulator board is
communicating with the OIM; record information on the fault,
press the OIM fault reset key.
Blink • I/O is not being scanned, the Regulator board is not
communicating with the OIM; record any information about the
fault and cycle power.