4 Designing the Power Supply System
4 - 12
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
Maximum I/O Power Supply Current
The maximum I/O power supply current is the maximum current that the I/O power supply that is
connected to the Additional I/O Power Supply Unit can supply through the NX bus connectors to the
NX Units.
When an Additional I/O Power Supply Unit is used on the CPU Rack, the maximum value is 4 A
regardless of the Unit specifications.
For example, when an NX-PF0730 Additional I/O Power Supply Unit is used, its maximum I/O
power supply current is 10 A. However, you must operate the NX-PF0730 at 4 A or less when you
use it on the CPU Rack.
Use the I/O power supply current for the CPU Rack of NX1P2 CPU Unit at 4 A or less. Using
the currents that are outside of the specifications may cause failure or damage.
NX-series NX1P2 CPU Unit
a. Total current consumption from I/O power
supply is 4 A or less
(NX Units with the supply from external
source or no supply are excluded from
calculation)
b. The voltage drop in the I/O power supply is
within the voltage specifications of the I/O
circuits of the NX Units and the connected
external devices.
a. Total current consumption from I/O power
supply is 4 A or less
(NX Units with the supply from external
source or no supply are excluded from
calculation)
b. The voltage drop in the I/O power supply is
within the voltage specifications of the I/O
circuits of the NX Units and the connected
external devices.
Additional
I/O Power
Supply
Unit 1
NX Unit
(no
supply)
Additional
I/O Power
Supply
Unit 2
NX Unit
(supply
from
the NX
bus)
NX Unit
(supply
from
the NX
bus)
NX Unit
(supply
from
the NX
bus)
NX Unit
(supply
from
the NX
bus)
NX Unit
(supply
from
external
source)
•
When NX Units that require supply
from the NX bus are on the CPU Rack
•
When it exceeds the maximum I/O power supply
current, 4 A
•
When the I/O power supply voltage drops severely
•
When separating the I/O power supply
8 max.
I/O
power
supply
I/O
power
supply
External
device
To external
devices
To external
devices
End Cover
I/O power supply terminals
External
device
I/O power
supply
(DC)
I/O power
supply
(DC)
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