6F8C0903
37
3.5 Network Power/Grounding
3
3.5.3 Network power unit (24 VDC)
Purchase network power units because they are not supplied with the DN311.
Use network power units that meet the following specifications:
Table 3-3 Network Power Unit Specifications
Item Specifications
Output voltage 24 VDC ±1%
Output current 16A or less
Input fluctuations 0.3 % maximum
Load fluctuations 0.3 % maximum
Effects of ambient temperature
0.03 %/
o
C maximum
Input Voltage 120V ±10%
230V ±10% (if necessary) or automatic changeover within
range of 95 to 250 V
Input frequency 47 to 62 Hz
Output ripple 250 mVp-p
Output capacity 7000 µF
Ambient temperature
Operating: 0 to 60
o
C*
Storage: -40 to 85
o
C
* : Rated output at 60
o
C can be derated.
Instantaneous maximum output
current
Less than 65 A (at peek)
Protection against overvoltage Provided (No value specified)
Protection against overcurrent Provided (Maximum current: 125%)
Startup time 250 ms till 5% of the final output voltage
Overshoot at startup 0.2% maximum
Stability 0 to 100% load (under all conditions)
Insulation Between output and AC power unit; between output and
cabinet grounding
Conformity Required: UL
Recommended: FCC Class B, CSA, TUV, VDE
Ambient humidity 20 to 90% (no condensation)
Surge current capacity 10% of reserve capacity
Usage Recommendations
• Use a network power with a capacity much greater than the total current consumption neces-
sary for the network.
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