Omron Sysmac NX-PD1000 User Manual page 89

Do not allow the inrush current to exceed the values in the table below.
Connecting destination of
Additional I/O Power Sup-
ply Unit
NX1P2 CPU Unit
Communications Coupler
Units
*1. When the Additional I/O Power Supply Unit is connected to the CPU Unit, the value will be as described on
this table, regardless of the specification of the Additional I/O Power Supply Unit.
Refer to the user's manual for the Communications Coupler Unit on the ratings for Communications
Coupler Unit that can supply I/O power.
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)
Ip
Ia
0A
τ
For details on the current consumption from I/O power supply of the NX Units to be used, refer to the
user's manual for individual NX Units.
Refer to the user's manual for the connected CPU Unit or the Communications Coupler Unit for
details on calculating current consumption from I/O power supply.
Precautions for Correct Use
Select an I/O power supply with sufficient capacity by considering the inrush current when the
power is turned ON. Sometimes, the I/O power supply may not be turned ON caused by inrush
current when the power is turned ON.
NX-series System Units User's Manual (W523)
Model of Additional I/O Power
Supply Unit
NX-PF0730
NX-PF0630
NX-PF0730
NX-PF0630
2
Irms
T
4 Installation and Wiring
Peak value Pulse width
*1 *1
20 A 1 s
50 A 1 s
20 A 1 s
4
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