Chapter 5 Maintaining the Router
Removing and Replacing a DC PDU
Step 3 Loosen the terminal block screws to disconnect the positive, negative, and ground wires from the DC PDU terminal block of the faulty PEM (Figure
Warning To prevent injury and damage to the equipment, always remove the source DC power leads and ground from the power shelf terminals in the following order:
(a) negative (–), (b) positive (+), (c) ground.
Caution Before removing wires, be sure to note the color for each type of wire (positive, negative, and ground). Because there is no color code standard for source DC wiring, you must be sure which power wires are connected to the proper positive
(+)and negative
Figure 5-13 DC PDU Terminal Block
4
+ GND
1
2
3
66949
1 | Negative port | 3 | Ground port |
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2 | Positive port | 4 | Terminal port connector screws |
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