MX2020 DC Power Supply Module LEDs
Each DC PSM (-48 V and 240 V China) faceplate contains four LEDs. These LEDs are described in Table 1. 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.
Label |
Color |
State |
Description |
|---|---|---|---|
PWR OK |
Green |
On |
PSM is functioning normally with no alarms. |
Yellow |
On |
PSM controller is functioning normally. |
|
– |
Off |
PSM is not functioning normally or the PSM controller is off. |
|
FAULT |
Red |
On |
PSM is not functioning normally or the DC input voltage of one or more feeds is out of range. |
– |
Off |
PSM is functioning normally or both the DIP switches are set to off. |
|
INP0 |
Green |
On |
DC input is within required voltage range and the DIP switch is set to on. |
Yellow |
On |
DC input is detected but voltage is out of range. |
|
– |
Off |
DC input to the PSM is not present. |
|
INP1 |
Green |
On |
DC input is within required voltage range and the DIP switch is set to on. |
Yellow |
On |
DC input is detected but voltage is out of range. |
|
– |
Off |
DC input to the PSM is not present. |