Rockwell Automation SA500 AC Power Modules - Manual (Page 15)

Power Module Mechanical Description 2-3
2.1 LED Indicators
The LEDs on the faceplate of the Power Module indicate the status of the PMI,
inverter, fiber-optic link, rail I/O, resolver feedback signal, and drive I/O. The status of
the LEDs is also reported in the UDC module’s dual port memory. See the SA500
Drive Configuration and Programming instruction manual (S-3044) for a complete
description of the following status bits. Note that all faults indicated by the LEDs
(except for the RAIL FLT LED) will result in the PMI disabling the power device gates,
which will cause the motor to coast to a stop.
The LED indicators on the module faceplate are defined as follows:
PWR OK (green) - The “PWR OK” LED indicates that all power supply voltages
for the PMI are at acceptable operating levels. The status of
the DC-to-DC converter is available in the UDC module’s dual
port memory (register 202/1202, bit 12). This LED also
indicates that the DC bus is powered up.
OK (green) - When power is applied to the Power Module, the LED will turn
on to indicate the PMI has passed its internal power-up
diagnostics. After power-up, this LED will turn off if the
internal watchdog times out. This will cause the drive to
disable the gate drive circuitry in the inverter.
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 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.
P.M. FLT (red) - When lit, this LED indicates that one of the fault conditions
listed below has been detected in the Power Module:
• Overtemperature
Corresponding UDC location: Register 202/1202, bit 0
• DC bus overvoltage
Corresponding UDC location: Register 202/1202, bit 2
• Vcc (+5V) supply undervoltage
Corresponding UDC location: Register 202/1202, bit 3