Instruction manual

2. Preparation for Installation

Figure 2-10 Terminal board of the DC power supply unit

(1) Cable clamp

(2) 0V terminal (screw: M6)

(3) −48V terminal (screw: M6)

(4) Ground terminal (screw: M6)

(2) Distribution board

Use circuit breakers on the branch circuit supplying power to the Switch. See the

following table for the rated breaker capacity and the required quantity.

Table 2-11 Rated breaker capacity and required quantity

Rated breaker capacity Power supply redundancy Required number

None 1 60 A

Required 2

NOTE

For easy operation, the distribution board should be installed in the

same room as the Switch or in an adjacent room.

NOTE

For a redundant power supply, the power from different power supply

systems can be supplied to each power supply unit.

(3) Requirements for the incoming current to the distribution board

The capacity of the incoming current to the distribution board must be greater than

that of the breaker operating current described in the above (2) Distribution board.

Ensure that the capacity for incoming current to the distribution board

is greater than the operating current of the circuit breaker. If it is not,

the circuit breaker might not operate properly in the event of a failure,

which could result in fire.