CAUTION: The maximum torque rating of the terminal studs on the DC power
supply is 36 in-lb. (4.0 Nm). The terminal studs may be damaged if excessive
torque is applied. Use only a torque-controlled driver or socket wrench to tighten
nuts on the DC power supply terminal studs.
NOTE: The DC power supplies in slots PEM0 and PEM1 must be powered by dedicated
power feeds derived from feed A, and the DC power supplies in PEM2 and PEM3 must
be powered by dedicated power feeds derived from feed B. This configuration provides
the commonly deployed A/B feed redundancy for the system. For information about
connecting to DC power sources, see “Electrical Specifications for the MX960 DC Power
Supply” on page 225.
12. Verify that the power cabling is correct, that the cables are not touching, and that they do not block
access to router components or drape where people could trip on them.
13. Replace the clear plastic cover over the terminal studs on the faceplate.
14. Switch on the dedicated customer site circuit breaker.
15. Verify that the INPUT 0 OK or INPUT 1 OK LEDs on the power supply are lit green steadily. If using
two feeds, verify that both INPUT 0 OK and INPUT 1 OK LEDs on the power supply are lit steadily.
The INPUT OK will be lit amber if that input’s voltage is in reverse polarity. Check the polarity of the
power cables to fix the condition (see Figure 118 on page 349 and Table 114 on page 349.
16. Move the switch to the on (|) position.
17. Verify that the DC OK LED is lit green steadily. See Table 114 on page 349 for information on MX960
high-capacity DC LEDs.
348
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