7210 SAS-M CHASSIS INSTALLATION GUIDE Installing the Chassis
Issue: 07 3HE 10089 AAAA TQZZA Edition 01 41
3.2.4.2 Connecting to DC Power
The 7210 SAS-M chassis supports the –48V and +24V DC power modules. Hence,
the steps below are applicable for either the –48V or the +24V DC power modules.
Required tools: a small flat-tip screwdriver
To connect DC power:
Step 1. Before a VDC power module can be used, you must connect an external DC
power source to the DC power connection on the left side of the front panel
(see Figure 1). The external DC power supply must be between –36 to –72
VDC, and protected with a circuit breaker.
Step 2. Connect the VDC power feed using the VDC input and RET A/B (return)
lines for power source A and B, respectively. Insert the wires in to the DC
input plug using a small flat-tip screwdriver. Color code the wiring according
to local standards to ensure that the input power and ground lines can be
easily distinguished.
Danger: Before wiring the DC plug or connecting power to the switch, ensure that power to
the feed lines is turned off at the supply circuit breaker or disconnected from the power bus.
Caution: Do not install a –48V and a +24V AC power module in a 7210 SAS-M chassis the
same time.
Note:
• An additional chassis ground point is located below the DC power entry block, for
attaching a DC power chassis ground if required by local electrical codes. The ground
point should be connected with an M4 screw and a terminal lug as specified by local
electrical codes.
• If a single power feed (either A or B) is connected to provide power to the system, it
supplies power to both of the power modules if two modules are plugged in. The DC
power feeds, A and B, are internally bridged using a diode.
• To provide adequate circuit protection between the DC power supply and the switch, all
intermediate wiring and circuitry should be rated to carry a load at least two times the
maximum rating for the 7210 SAS-M (see Specifications on page 73).
• The wiring between the DC power supply and the 7210 SAS-M must be stranded
copper wire within the range of 16 to 20 AWG in accordance with local electrical codes.
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