4U quick set-up checklist
37
Model 6476 User Guide
4 • Installation checklist
2. Strip back the insulation on each of the supply wires approximately 1/4 inch.
3. Insert the stripped end of the positive lead into the “+DC input” of the terminal block. Tighten the screw
until the power lead is firmly fastened. Repeat the procedure for the negative lead, using the “-DC input”
of the terminal block. Make sure that there is no exposed wire.
Figure 14. DC connector, -DC and +DC input view
4. Repeat steps 1 through 3 to install the remaining DC power connection.
Grounding the Model 6476—AC and DC units
Do the following:
1. Assemble a ground wire using #10 AWG wire with green-colored insulation and two ring terminals. Make
the wire long enough to reach one of the following ground sources:
– The building ground rod (generally located at the site’s main service entrance)
– A sprinkler system pipe
– A cold-water pipe
– Building structural steel
2. Install the ground wire between the grounding studs (see
figure 13
on page 36 for AC power entry, or
figure 14
on page 37 for DC power entry) and the grounding source.
Changing the VI/O configuration jumper
The Model 6476 VI/O is factory configured for 3.3V. Do not change this setting when using ForeFront cards.
Optional Frame Ground/Signal Ground Connect
There are two headers, J4 and J5, located in the power bay area (see
figure 12
on page 31). J4 corresponds to
signal ground (SG) and J5 corresponds to frame ground (FG). These two headers provide an option to connect
To avoid the risk of personal injury, the distance between ground and the
equipment rack must not exceed the distance specified in either local electrical
codes or the National Electrical Code.
DC power module
DC power
entry connectors
Grounding
studs
WARNING
