Power Supply Facility For −48 V Dc - Alaxala AX6300S Series Instruction Manual

2. Preparation for Installation
(4) 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 (3) Distribution board.
NOTE
In addition, when a Switch is turned on, inrush current shown in the figure below
flows. Consider measures for avoiding a voltage drop in the power supply facility
caused by the inrush current.
Table 2-9 Inrush current
Current
30 A
CAUTION
NOTE
2.4.3 Power supply facility for −48 V DC
(1) DC power cable
When using a Switch in a −48 V DC environment, use only the power cable
described in Table 2-10 DC power cable specifications.
Use the terminals described in Figure 2-8 0 V and −48 V terminals as the 0 V and
−48 V terminals of a DC power cable, and use either terminal described in Figure
2-9 Ground terminal as the ground terminal.
For information about the distances from the cable clamp to the 0 V terminal, the
−48 V terminal, and the ground terminal, see Figure 2-10 Terminal board of the DC
power supply unit.
Table 2-10 DC power cable specifications
Power supply unit
PS-D11
60
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.
Generally, the breaker operating current is greater than the rated
current. Check the specifications of the circuit breaker.
Time
150 ms
When a Switch is turned on, inrush current flows. Consider measures
for avoiding a voltage drop in the power supply facility caused by the
inrush current. Voltage drops affect not only the Switch, but also the
devices connected to the same power supply facility.
The inrush current described above is the value for a single power
supply unit.
Number of cores
Three cores
Cable specifications
AWG No.
4
External diameter
of the cable
30 to 32 mm