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4-3-5
Restrictions on Inrush Current for ON/OFF Operation
This section describes the restrictions on inrush current from the I/O power supply that occurs when
connected external devices turn ON and OFF.
Inrush Current Restrictions
If inrush current to the I/O power supply occurs when a connected external device turns ON or OFF,
do not allow the effective value of the I/O power supply current to exceed the following rated values
when the inrush current is added to the current consumption from the I/O power supply.
• Maximum I/O power supply current
• Current capacity of power supply terminals for the I/O power supply
Also, maintain the peak inrush current 20 A maximum and maintain the pulse width 1 s maximum.
Refer to
4-4-3 Selecting Protective Devices
on page 4-25 for the rated values of the items when the
CPU Rack is used.
Calculating the Effective Value of the I/O Power Supply Current
The formula to calculate the effective value of the I/O power supply current, Irms, is given below.
Irms= Ip
2
× D+Ia
2
× (1-D)
(D=
τ
/T)
• Ip: Peak inrush current (A)
• Irms: Effective value of I/O power supply current (A)
• Ia: Total current consumption from the I/O power supply (A)
• D: Inrush current duty
•
t
: Inrush current pulse width (s)
• T: Inrush current period (s)
Ip
Ia
Irms
τ
T
0A
4 Designing the Power Supply System
4-21
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
4-3 Designing the I/O Power Supply System
4
4-3-5
Restrictions on Inrush Current for ON/OFF Operation
Содержание NX1P2 series
Страница 8: ...Manual Structure 6 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 52: ...Revision History 50 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 82: ...2 System Configuration 2 10 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 170: ...a b Flat blade screwdriver 1 2 5 Installation and Wiring 5 26 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 174: ...4 Close the Memory Card cover 5 Installation and Wiring 5 30 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 176: ...4 Close the Memory Card cover 5 Installation and Wiring 5 32 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 224: ...0 4 mm Side view Front view 2 5 mm 5 Installation and Wiring 5 80 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 258: ...Appendices A 10 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 259: ...I Index I 1 NX series NX1P2 CPU Unit Hardware User s Manual W578 I...
Страница 262: ...Index I 4 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 263: ......