
Rockwell Automation Publication 750-PM101B-EN-P - April 2022
95
Chapter 4 Troubleshooting
DC Precharge Circuit Board Status Indicators
The PowerFlex 755T DC precharge module uses status indicators and a 7-
segment display to report conditions. The DC precharge circuit board is
located behind a transparent panel on the left side of the DC precharge module
chassis. The DC precharge circuit board status indicators are not visible while
installed in a DC precharge module.
Name
Color
State
Description
DS7 (DC 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 (DC Precharge)
Green
Steady
Precharge Done (Molded case switch is closed.)
Flashing
Molded case switch is closing.
Yellow
Steady
Molded case switch is opening.
Flashing
Not Ready
Red
Flashing
Molded case switch 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: P1 = Precharge 1)
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.
• 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.
DS7
DS2
DS3
DS4
DS5
7-Segment Display
DC Precharge Module