1. System Installation Requirements
1-16
TI 33Q01J10-01E
Selecting a Power System
The CS 3000 system requires a power supply that satisfies power requirements in accordance
with EMC regulations. It is recommended that an external power supply unit is employed in order
to prevent disruptions due to momentary or extended power failure, line noise, or lightening
surges, as well as to suppress harmonic current from various devices. For selection of the power
supply unit, consult with a power unit manufacturer taking the following points into consideration.
Source Output Capacity
Take the following items into consideration when consulting with a power unit manufacturer to
determine the output capacity.
Power consumption:
Both volt-ampere and watt data should be studied
(refer to Chapter 4).
Device crest factor:
Ratio of the peak value to the effective value of the
device input current.
Device in-rush current:
See Chapter 4 Table “In-rush Current.” The method of
turning on the power should also be studied.
Backup ready time after failure:
Time period required to backup the devices when power
fails.
Reserve capacity:
An extra power capacity should be determined as
reserve to meet any device additions.
Crest factor
The crest factor is the ratio of the peak value to the effective value of the device input current.
F010304.ai
Input voltage waveform
Approx. 5 ms
Input current waveform
Effective value
Peak value
Effective value
Peak value
Crest factor =
Figure Input Voltage and Input Current Waveforms
Nov. 20, 2003-00
