Installing the MX2020 Air Filters | 459
Removing the MX2020 Air Filters | 456
MX2020 DC and Power Supply Module LEDs
Each DC PSM (-48 V and 240 V China) faceplate contains four LEDs. These LEDs are described in
Table 34 on page 117. Eighteen bicolor LEDs labeled 0 through 8 for the bottom nine PSMs, and 9 through
17 for the top nine PSMs, are located in the center of the craft interface.
The primary input of the PSM is a dual redundant feed, INP0 and INP1. Both feeds are active during
operation, but both feeds may or may not be providing current. In addition, a PSM failure triggers the alarm
LED on the craft interface.
Table 34: MX2020 DC Power Supply Module LEDs
DescriptionStateColorLabel
PSM is functioning normally with no alarms.OnGreenPWR OK
PSM controller is functioning normally.OnYellow
PSM is not functioning normally or the PSM controller is off.Off–
PSM is not functioning normally or the DC input voltage of one or more
feeds is out of range.
OnRedFAULT
PSM is functioning normally or both the DIP switches are set to off.Off–
DC input is within required voltage range and the DIP switch is set to on.OnGreenINP0
DC input is detected but voltage is out of range.OnYellow
DC input to the PSM is not present.Off–
DC input is within required voltage range and the DIP switch is set to on.OnGreenINP1
DC input is detected but voltage is out of range.OnYellow
DC input to the PSM is not present.Off–
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