Rockwell Automation SA3100 Power Module Interface (PMI) Regulator - Manual (Page 20)

2-4 PMI Regulator
PMI PROCESSOR AND DRIVE STATUS LEDs
OK (green) - When power is applied, this LED will turn on to indicate the
PMI processor has passed its internal power-up diagnostics.
After power-up, this LED will remain on while the Regulator is
operating properly. It will turn off if an internal watchdog
times out
COMM OK (green) - When lit, this LED indicates messages are being received
correctly over the fiber-optic link from the UDC module. If this
LED is off, it indicates there is a fault in the link or that the
UDC module is unable to communicate.
If the PMI processor does not receive a message from the
UDC module for two or more CCLK periods, or logs two
consecutive communication errors of any type, the PMI
processor will shut the drive down.
Detailed information about the communication link (e.g.,
number of messages sent and received, CRC error count) is
displayed in the UDC/PMI Communication Status Registers
(80-89/1080-1089) on the UDC module.
DRV RDY (green) - When lit, this LED indicates that all of the following conditions
are met:
• All power supplies are at acceptable levels
• The on-board field programmable gate array (FPGA) has
been configured
• The on-board watchdog timer is being updated by the PMI
processor
• The operating system has been downloaded to the PMI
processor
• The PMI processor has passed the power-up diagnostics
Corresponding UDC location: Register 202/1202, bit 11
If the PMI processor fails any of its power-up diagnostics, the
motherboard must be replaced.