Appendix; Appendix 1: Selection Conditions For 24Vdc Stabilized Power Supply - Mitsubishi Electric MELFA CR800 Series Instruction Manual

8. APPENDIX

8.1 Appendix 1: Selection Conditions for 24VDC Stabilized
Power Supply
Consider the following characteristics when selecting the stabilized power supply (prepared by machine
manufacturer).
Use a power supply that complies with CE Marking or that follows the safety standards given below.
（1） Stabilized power supply selection items
Item
Output Voltage
Voltage fluctuation
Ripple noise
Spike noise
Overcurrent output cutoff
function
Output current
Output holding time
（2） Standards
Item
Safety Standards
Noise Terminal Voltage
High Harmonics
Restrictions:
（3） Reference values for current consumption at 24 V supply voltage
Item
Control power supply
①
②
Input circuit
③
④
Output circuit
⑤
When using a single stabilized power supply with the maximum input and output specifications, the total current
consumption (①+③+⑤) is approximately 8.38A.
Therefore, it is necessary to select a stabilized power supply of 24 V/200 W or more.
Selection
criteria
DC24V
±5％
120mV
（maximum）
500mV
（maximum）
－
－
20ms(min)
Selection criteria
UL1950, CSA C22.2 No. 234 approved, IEC950 compliant
FCC Class A, VCCI-Class A
Current IEC61000-3-2
Consumption
current
0.3A
5mA/point
80mA
2.0A/point
approx. 8.0A

Appendix 1: Selection Conditions for 24VDC Stabilized Power Supply 8-127

Remarks
If the distance between the stabilized power supply
and the 24VDC input unit is far, select a stabilized
power supply capable of setting 24VDC or higher as
the output voltage, taking into account the effect of
voltage drop due to cables.
±5% or less of 24VDC output
Select a power supply with an overcurrent output
cutoff function.
Refer to the maximum current consumption of the
unit in use
and calculate.
Instantaneous power failure time (AC side)
Remarks
When all 8 input points are used (16 points in total
due to signal duplication)
When all 4 points are used in the entire unit
8 APPENDIX