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2. Move the input mode DIP switch 0 (left switch) to the ON (top position) for the bottom feed INP0
(expected to be connected), and DIP switch 1 (right switch) to the ON (top position) for the top feed
INP1 (expected to be connected). If both DIP switches 0 and 1 are turned to the ON position, then
both top and bottom feeds are expected to be connected (see
The AC power system provides dual redundant feed. Each PSM takes in two AC feeds and uses one
of the two. Only one of the two feeds is active during power operation. Each feed is a single-phase
AC system 200–240 VAC derived from a three-phase delta or wye AC input system. In addition, a
PSM failure triggers the alarm LED on the craft interface. Each PDM has an LED per feed indicating
whether the feed is active or not, or whether the feed is connected properly.
Figure 39: Selecting AC Power Subsystem Feed Redundancy
3. Ensure that the voltage across the AC power source cable leads is 0 V and that there is no chance
that the cable leads might become active during installation.
4. Using both hands, slide the PSM straight into the chassis until the PSM is fully seated in the chassis
slot. Tighten the two captive screws to secure the PSM to the chassis.
5. Verify that the INP0 or INP1 LEDs on the PSM are lit green steadily. The INP0 or INP1 LEDs are lit
yellow if that input's voltage is in reverse polarity. Check the polarity of the power cables to fix the
condition (see
Figure 40 on page 71
6. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to
one of the ESD points on the chassis.
7. Move the switch to the on (|) position.
8. Verify that the PWR OK LED is lit green steadily. See
MX2010 AC PSM LEDs.
and
Table 8 on page
70).
Table 8 on page 70
Figure 39 on page
69).
for information about
69
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