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MX2000 AC Power Supply Module Description

 

There are a total of nine AC power supply modules (PSMs) located at the rear of the chassis in slots PSM0 through PSM8 (left to right). The AC PSMs in slots PSM0 through PSM8 provide power to:

  • fan trays (0, 1, 2, and 3; 0 and 1 for MX2008)

  • MPCs in slot 0 through 9

  • CB-REs in slot 0 and 1

  • SFBs in slot 0 through 7

The MX2000 line of routers supports a three-phase delta AC power system, three-phase wye AC power system, or a single-phase AC power system.

Caution

Do not mix AC and DC PSMs or different PDM types within a single system. The MX2000 line of routers configured for three-phase wye AC input power must use only three-phase wye AC PDMs and three-phase AC PSMs. The systems configured for three-phase delta AC input power must use only three-phase delta AC PDMs and AC PSMs. The systems configured for single-phase AC input power must use only single phase AC PDMS and AC PSMs.

In a three-phase AC power system, the AC power going to the PSMs is split into a pair of phases. Each PSM works on a single phase. This means the power system works independent of the kind of AC feed connected. You can connect one or two feeds, depending on the power system configuration, number of PSMs, redundancy, and so on. Each phase from each of the two feeds is distributed among one or two PSMs. One feed has each phase going to two PSMs and the other feed has each phase going to a single PSM.

The single-phase AC power distribution module (PDM) provides an AC input power interface to the PSM through the system power midplane. Up to nine PSMs can be connected to a single-phase AC PDM. Each single-phase AC PDM accepts seven or nine AC power cords from a single-phase AC source. Each AC input is independent and feeds one PSM.

The AC PSMs are hot-removable and hot-insertable.

Up to nine PSMs may be connected in parallel per power subsystem to increase available power for MPCs, as needed and to provide redundancy. Figure 1 shows the AC PSM.

Figure 1: AC Power Supply Module
AC Power Supply Module

The AC power system provides dual redundant feeds (INP0 and INP1). Each PSM takes in two AC feeds and uses one of the two. One input feed is active during operation. Each feed is a single-phase AC system 200–240 VAC derived from a three-phase delta or wye AC input system. These feeds are set by the input mode DIP switch located on the AC PSM. Move the input mode DIP switch to the on or off position to determine the power supply feeds (see Table 1 and Figure 2).

Table 1: DIP Switch Positions on the AC PSM

Left Switch Position

Right Switch Position

Input Source

Off

Off

None

On

Off

Input 0 (INP0)

Off

On

Input 1 (INP1)

On

On

Both Input 0 and Input 1

Figure 2: Selecting the Input Feed on the AC Power Supply Module
 Selecting the Input Feed
on the AC Power Supply Module

A PSM failure triggers the alarm LED on the craft interface. For information about connecting to AC power sources, see MX2000 AC Power System Electrical Specifications.