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A-17
IM 39J06B40-01EN 14th Edition: May 30, 2022
Figure Distortion of Input Voltage Waveform

Inrush Current
An input current much larger than normal will flow when the power supply is turned on.
Refer to the specification of the power supply module for inrush currents to each power
supply module.
Make sure that the supplied power and protection devices can withstand this inrush
current.
TIP
The peak values and waveforms of the current are affected by the impedance of the input system.
These change depending on the system structure (when comprised of multiple devices) and the power
supply line condition.
Generally, the inrush current when the system is comprised of multiple devices will be less than the
total sum of the inrush current of each device.

Output Capacity
The output capacity of the power supply device is determined by calculating the
maximum electric power demand of the system, but the peak value of the current will be
2 to 5 times the effective value. The effects of inrush current, as well as allowance for
future device expansion must be carefully considered.

Power Consumption Calculation
Refer to the power supply module specification for the maximum power consumption.
Take into consideration future expansion and device changes. In general, the maximum
value should be used.
A: Ideal input voltage wave with no distortion
B: Distorted input voltage wave
Pe
ak
v
al
ue A
Pe
ak
v
al
ue
B