Installation guide

Installing a 1900 W DC Power Supply
BlackDiamond 20808 Switch Hardware Installation Guide
69
Connecting the PSU to the DC Source Voltage
The DC power connection at your facility must be made by a qualified electrician, following the
instructions in this section.
WARNING!
Always make sure that the DC circuit is de-energized before connecting or disconnecting the DC power cables on the
1900 W DC PSU.
CAUTION
Provide proper connection and strain relief on the DC power cables in accordance with all local and national
electrical codes.
To connect the DC power input cables:
1 Verify that the DC circuit is de-energized.
2 Attach an ESD-preventive wrist strap to your bare wrist and connect the metal end to the ground
receptacle on the top right corner of the switch front panel.
3 Remove the cover from the terminal block (Figure 37). Set the cover and screws in a safe place.
4 Connect the DC power input cables as follows:
a Using a provided screw, attach the red wire (–48 V) to the negative terminal (–).
b Using a provided screw, attach the black wire (–48 V RTN) to the positive terminal (+).
c Tighten both screws to 10 inch-pounds.
5 Place the cover over the terminal block and secure it using the provided screws.
Figure 37: Connecting the DC Power Cables
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