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Cabling the Power Input Module

Input power is supplied to the system by two redundant and independent -48 VDC line feeds. If one line fails, the other can carry the full load of the system. See Appendix 9, System Specifications for the power requirements for the ERX system.

Table 4-1 identifies the power input module cabling requirements.

Table 4-1 Power input module cables/wires needed 
Cable/Wire
From
To
One 10-AWG ground wire
Power input module ground terminal
Termination ground
Two 10-AWG wire leads
Power input module Power A -48 VDC and RTN leads
Appropriate leads on power source No. 1
Two 10-AWG wire leads
Power input module Power B -48 VDC and RTN leads
Appropriate leads on power source No. 2

Follow the procedure in this section to connect power cables to the system. Refer to Figure 4-2 as needed.



Caution: Before you begin this procedure, ensure that both Power A and Power B switches are in the OFF position.

  1. Loosen the four screws from the clear power input module cover.
  2. Remove the cover by sliding it upward so that the screw heads line up with the holes in the cover.
  3. Set the cover and screws aside for later use.
  4. Connect the ground wire to the ground terminal on the lower portion of the power input module, and secure it with a #10 kep nut.


Note: We recommend a minimum of 10-AWG ground wire with a ring-style terminal.

  1. Connect the other end of the ground wire to the appropriate ground termination lead.


Warning: Be sure the power source is turned off and the ERX system is turned off before continuing with this procedure.

  1. With the wrench or nut driver, loosen the 3/8" hex nuts from the bottom -48 VDC and RTN leads of Power A, and connect a 10-AWG wire to each.
  2. With the wrench or nut driver, tighten the hex nuts on both leads.
  3. Attach the opposite end of Power A's wire leads to the appropriate leads on your power source.


Note: To provide redundancy, Power A and Power B leads should not terminate at the same power source.

  1. Repeat Steps 6-8 for Power B.
  2. Reattach the clear power input module cover that you removed in step 1 by securing the four screws.


Figure 4-2 Power input module

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