SEE
ALSO
For more information about fan unit, refer to:
• 7.7.2, “Replacing Node Fan Unit” on page 7-37
• ProSafe-RS Installation Guidance (TI 32S01J10-01E)
• User's manual of each device
n
Guidelines for Selecting a Power Supply Unit
Regarding the system of the Product, you must take note of the following precautions by us-
ing a power supply unit to satisfy the various requirements of the EMC regulations:
•
Prevent power supply problems such as power failure or short interruptions.
• Protect the power supply unit against power line noise and lightning surge.
• Suppress power supply harmonic current from devices.
You must consult with the power supply unit suppliers, and then select and install a suitable
power supply unit with the considerations described in the following sections.
l
Notices on Deciding the Output Capacity of Power Supply Unit
Consult with the power supply unit suppliers and decide a suitable output capacity of the pow-
er supply unit with the following considerations:
• Power consumption
Power consumed in both volt-ampere (VA) and watt (W).
• Device crest factor
Ratio of the peak value to the effective value of input current supplied to each device.
• Device inrush current
The maximum inrush current when power is turned on.
• Power failure backup time
Time required to back up the devices when power fails.
• Reserve capacity
An extra power capacity for additional devices and so on.
SEE
ALSO
For more information about power consumption, rush current, and power and ground cabling, refer to:
ProSafe-RS Installation Guidance (TI 32S01J10-01E)
l
Crest Factor
The crest factor refers to the ratio of the peak value to the ef
fective value of any input current
of a device.
xii
IM 32Q06C10-31E 4th Edition : Jan.30,2015-00
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