92 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 Figure 67 on page 93
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
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