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 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.

Table 1: MX2020 DC Power Supply Module LEDs

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.
`FAULT`	–	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.

MX2020 DC and Power Supply Module LEDs

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