Omron NX Series Hardware User Manual

Current Breaking/fusing time
6 A 1 min max.
12 A 15 s max.
21 A 5 s max.
30 A 2.5 s max.
Installation Locations for Protective Devices
Install protective devices for the Unit power supply and I/O power supply in the locations that are
shown in the following figure.
External device
End
Cover
Internal circuits
NX Unit power supply
Unit power supply terminals
Internal
power
supply
circuit
NX-series
NX502 CPU Unit
I_unit1
I_unit2
Protective
device
I_io1 I_io2
I/O power supply
Block that the CPU Unit supplies Unit power supply.
Block that an Additional I/O
Power Supply Unit 1
supplies I/O power supply.
Block that an Additional I/O
Power Supply Unit 2
supplies I/O power supply.
Block that an Additional NX Unit Power
Supply Unit supplies Unit power supply.
External device
Additional
I/O Power
Supply Unit
1
Additional
I/O Power
Supply Unit
2
NX Unit power supply
Unit power
supply
terminals
I/O power
supply
terminals
I/O power
supply
terminals
Additional
NX Unit
Power
Supply Unit
Protective
device
Protective
device
Protective
device
Power
supply
I/O power supply
Unit power supply
(24 VDC)
I/O power supply
(24 VDC, etc.)
Internal
circuits
However, fewer protective devices may be required when the current consumption of each block does
not exceed the rated current.
An example of this is provided below.
•
Using Unwired Unit Power Supply Terminals
In this example, the current consumption from each power supply is as follows:
Current consumption from Unit power supply: I_unit1 + I_unit2 ≤ Lowest rated current
Current consumption from I/O power supply for NX Units: I_io1 + I_io2 ≥ Lowest rated current
*1
4 Designing the Power Supply System
4-26
NX-series NX502 CPU Unit Hardware User's Manual (W629)

Omron NX Series Specifications

General

Brand	Omron
Model	NX Series
Category	Controller
Language	English