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Rockwell Automation Publication 750-PM101B-EN-P - April 2022
Chapter 4 Troubleshooting
AC Precharge Circuit Board Status Indicators
The PowerFlex 755T AC precharge module uses status indicators and a 7-
segment display to report conditions. See
for the location
of the AC precharge board.
Name
Color
State
Description
DS1 (AC Precharge)
Green
Flashing
Fiber connection is online.
Red
Flashing
Fiber connection is offline.
DS2 (240V AC)
Green
Steady
240V AC Okay
Yellow
Steady
240V AC Low Alarm
Red
Flashing
240V AC Loss Fault
Unlit
Off
240V AC Loss Alarm
DS3 (Communications)
Green
Steady
Fiber connection is online.
Yellow
Flashing
Communications Loss
Unlit
Off
Inactive
DS4 (AC Precharge)
Green
Steady
Precharge Done (Main circuit breaker is closed.)
Flashing
Main circuit breaker is closing.
Yellow
Steady
Main circuit breaker is opening.
Flashing
Not Ready
Red
Flashing
Main circuit breaker opened.
Unlit
Off
Ready
DS5 (Firmware Status)
Green
Steady
No faults or alarms are present.
Green /
Red
Flashing
Alternately
Update in progress.
Yellow
Steady
Alarm is present.
Red
Flashing
Fault is present.
7-Segment Display
Red
Steady
Normal Operation
• At powerup, the display indicates the major firmware revision
number, the minor revision number, and the build number for 1
second each.
• After powerup is complete, the display indicates the number
that is assigned to the module by the main control board.
(Shown: P0 = Precharge 0)
Alarms
• When an alarm condition exists, the display indicates the alarm
code.
• If there are multiple alarm codes, the display cycles through the
codes and displays each code for 2 seconds.
Flashing
Faults
• When a fault condition exists, the display indicates the fault
code for Port 14.
• If there are multiple fault codes, the display cycles through the
codes and displays each code for 2 seconds.
• If the device is faulted, the display only indicates fault codes.
Alarm codes are omitted.
DS1
DS2
DS3
DS4
DS5
7-Segment Display
Input Bay