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.
DC Precharge Status Indicators
The location of status indicators on a DC precharge circuit board.
Item
Description
A
DS2…DS5 and DS7 status indicators.
B
7-segment display.
DC Precharge Circuit Board Status Indicators - DS7 (DC Precharge)
Color
State
Description
Green
Flashing
Fiber connection is online.
Red
Flashing
Fiber connection is offline.
DC Precharge Circuit Board Status Indicators - DS2 (240V AC)
Color
State
Description
Green
Steady
240V AC Okay
Yellow
Steady
240V AC Low Alarm
Red
Flashing
240V AC Loss Fault
Unlit
Off
240V AC Loss Alarm
DC Precharge Circuit Board Status Indicators - DS3 (Communications)
Color
State
Description
Green
Steady
Fiber connection is online.
Yellow
Flashing
Communications Loss
Unlit
Off
Inactive
DC Precharge Circuit Board Status Indicators - DS4 (DC Precharge)
Color
State
Description
Green
Steady
Precharge Done (Molded case switch is closed.)
Green
Flashing
Molded case switch is closing.
Yellow
Steady
Molded case switch is opening.
Yellow
Flashing
Not Ready
Red
Flashing
Molded case switch opened.
Unlit
Off
Ready
DC Precharge Circuit Board Status Indicators - DS5 (Firmware Status)
Color
State
Description
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.
DC Precharge Circuit Board Status Indicators - 7-Segment Display
Color
State
Description
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.
Red
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.
DC Precharge 7-Segment Display Fault and Alarm Codes
Display Code
Display State
Condition Code
Condition Name
0
Flashing
12001
Image Watchdog Fault
0
Steady
12070
Board Over Temperature Alarm
1
Flashing
12002
Constants Message Invalid
1
Steady
12071
Board Over Temperature Fault
2
Flashing
12003
Constants Checksum
2
Steady
12072
Board Under Temperature Alarm
3
Steady
12073
Board Under Temperature Fault
4
Flashing
12004
Nonvolatile Data Checksum Fault
5
Flashing
12005
Power Supply Undervoltage
6
Flashing
12006
Precharge Fault
6
Steady
12108
240V AC Low
7
Flashing
12007
MCS Failed to Close or Wiring Bay Overtemp
7
Steady
12109
240V AC Loss
8
Flashing
12008
MCS Shunt Trip
9
Flashing
12009
MCS Aux Mismatch or Wiring Bay Overtemp
10
Flashing
12010
240V AC Loss Fault
10
Steady
12110
Fused Disconnect Open (MCS Open)
11
Flashing
12011
240V AC Over Voltage
12
Flashing
12012
Fused Disconnect Open (MCS closed)
15
Flashing
12050
Bus Fuse Harness
16
Flashing
12051
Bus Positive Fuse Blown
17
Flashing
12052
Bus Negative Fuse Blown
32
Steady
12053
Molded Case Switch Life Threshold Exceeded
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