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3.5.3 The Network Power Unit (24 Vdc)
The network power unit is not attached to the DN211; you have to buy such a unit in the
commercial market. Your network power unit must conform with the following specifications:
Item Specification
Output voltage 24Vdc ± 1%
Output current 16A or less
Input fluctuation Max. 0.3 %
Load fluctuation Max. 0.3 %
Effects by the ambient temperature Max. 0.03 % / °C
Input Voltage 120V ± 10 %
230V ± 10 % (if necessary) or
Automatic changeover within 95 to 250V
Input frequency 47 to 62 Hz
Output ripple 250 mVp - p
Output side capacity Max. 7000 µF
Ambient temperature During operation: 0 to 66°C ∗
When stored: −40 to 85°C
∗ : Rated output derating at 60°C is allowed.
Instantaenious max. output current less than 65A (at peek)
Protection against overvoltage Yes (No value specified)
Protection against overcurrent Yes (Max. current: 125 %)
Startup time 250 ms by the 5% value of the max. output voltage
Overshoot on startup Max. 0.2%
Stability 0 to 100% load (for all conditions)
Insulation Between output - AC power unit; between output - case
grounding
Conformity Required: UL
Recommended: FCC Class B, CSA, TUV, VDE
Ambiant humidity 20 to 90% (no dew)
Surge current capacity 10% of reserve capacity
Usage Recommendation
1. Use a network power whose capacity is much larger than the total current consumption
necessary for the network.