Installation Guide

Connecting the Ground Wire to a 300 W DC Power Supply
Follow these steps to connect the ground wire to a Summit 300 W DC power supply.
Warning
Be sure to connect the chassis ground wire before you connect any power cables.
Warning
Be sure to disconnect the ground wire after you disconnect all power 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 an
appropriate ground point on the rack.
3. Pull the cover o the terminal block.
4. Identify the grounding point on the front panel of the power supply.
5. Connect the ground wire to the grounding point as follows:
a. Insert a 6-32 UNC screw (provided) through the ring terminal and into the grounding point on
the power supply.
See Figure 266.
1
2
Figure 266: Connecting the Ground Wire (Front-to-Back Model 10933 Shown)
1 = Grounding point
2 = Ground wire
b. Tighten the screw to 12.6 in‑lb (1.42 N m).
6. Connect the other end of the wire to a known reliable earth ground point at your site.
7. Connect the power supply to the source, following the instructions in Connecting a 300 W DC Power
Supply to the Source Voltage on page 336.
Connecting a 300 W DC Power Supply to the Source Voltage
Two 300 W DC power supplies are available: model 10933 (front-to-back airflow) and model 10944
(back-to-front airflow). Both can connect to either a +24 V or a –48 V power source.
The connection instructions, starting at step 4 on page 337, are dierent depending upon whether you
are connecting to a +24 V power source or a –48 V power source.
Install a 300 W Internal DC Power Supply
Installing Switches
336 Summit Family Hardware Installation Guide