Omron NX Series User Manual page 81

Power Supply Used and Required Power Supply Capacity
Power Supply Used
5 to 24 VDC power is supplied to A1 and A3 terminals of the I/O power supply terminals (IOV or
IOG).
For the I/O power supply, use a SELV power supply with overcurrent protection.
A SELV power supply refers to a power supply with double or reinforced insulation between input
and output and with an output voltage of 30 V rms with a 42.4-V peak or an output voltage of 60
VDC max.
We recommend the following power supply.
Recommended power supply: OMRON S8JX-series Power Supply
Required Power Supply Capacity
The power supply capacity required by the I/O power supply to be connected is equal to the NX Unit
power supply total power consumption that uses the same I/O power supply.
However, if the inrush current occurs when a connected external device turns ON or OFF, do not
allow the effective value of the I/O power supply current including the inrush current to exceed the
following rated values.
• Maximum current of I/O power supply
• Current capacity of I/O power supply terminals
Do not allow the inrush current to exceed the values in the table below.
Additional I/O Power Supply Unit
Refer to the NX-series EtherCAT Coupler Unit User's Manual (Cat. No. W519) for information on the
EtherCAT Coupler Units.
Calculating the effective value of the I/O power supply current
The following gives the equation to calculate the effective value of the I/O power supply current,
Irms.
Irms = Ip ×D + Ia × (1-D) 2
(D = τ / T)
Ip: Peak inrush current (A)
Irms: Effective value of the I/O power supply current (A)
Ia: Total current consumption from I/O power supply (A)
D: Inrush current duty
τ: Inrush current pulse width (s)
T: Inrush current period (s)
NX-series System Unit User's Manual (W523)
Buy: www.ValinOnline.com | Phone 844-385-3099 | Email: CustomerService@valin.com
Unit name
NX-PF0730
NX-PF0630
2
4 Installation and Wiring
Model Peak value
50 A
20 A
Pulse width
1 s
1 s
4 - 21
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