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Eight pairs of wiring terminals (marked PSU1 through PSU8) are available on the DC terminal block of
the 12508E/12518E. The wiring terminals correspond to the power modules. The power source provides
power to the switch through the wiring terminals. If slot 1 is installed with a power module, the wiring
terminals marked PSR1 or PSU1 must be connected to the power source with a DC power cord to make
the power module operate correctly.
The 12508E-DC and 12518E-DC models adopt the PSE20KD1 DC power system.
To connect the PSE20KD1 DC power cords:
1.
Remove the screws from the power frame.
2.
Secure the blue DC power cord to the NEG (–) terminal on the terminal block with screws using a
Phillips screwdriver.
3.
Secure the ring terminal of the black power cord to the RTN (+) terminal on the terminal block with
screws using a Phillips screwdriver.
Figure 32 Connecting the DC power cords to terminals on the power supply
4.
Connect the other end of the DC power cord to the power source:
Connect the other end of the black DC power cord to the RTN (+) terminal that provides power
to the switch.
Connect the other end of the blue DC power cord to the –48V terminal that provides a power
supply to the switch.
5.
Install the protection cover:
a.
Remove the screws on the DC power frame.
b.
Install the protection cover on the wiring terminals.
c.
Fasten the screws using a Phillips screwdriver.
35

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