Bosch DCN Next Generation, Руководство по эксплуатации

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Overload indication
Each DCN socket of the central control unit and extension power supply has a red LED that
comes on to show that there is a power overload. An overload occurs when:
–
The necessary power for the devices is greater than that is supplied.
– A short-circuit occurs.
When an overload occurs, that socket is deactivated, and the connected devices do not
operate. The socket checks every 4 seconds (DCN-CCU2, DCN-CCUB2) or 30 seconds (DCN-
EPS) for power overloads.
Extension cables
Extension cables (LBB4116) have a direct effect on the available power. The longer an
extension cable, the less power is available to drive the connected devices. You must chose
the length of the extension cables carefully (refer to Maximum power consumption, page 69).
Maximum power consumption
Power correction
The necessary power from a DCN socket of the central control unit and the extension power
supply is affected by:
–
The type and number of connected devices.
– The lengths of the connected extension cables.
The power correction graph corrects the power level to compensate for the extension cables.
Calculation
To find the correction for each DCN socket of the central control unit and the extension power
supply with the graph, you must first calculate:
–
The total power consumption of the devices that are connected to the socket.
– The length of the longest extension cable sequence.
Total power consumption
Do as follows:
1.
Find the power consumption of each device from the consumption table (refer to Power
capacity, page 67).
2. Add together the power used by all the devices. The result is the total power
consumption of the devices that are connected to the socket.
Length of the longest extension cable sequence
Do as follows:
4
Add together the lengths of all extension cables in the longest sequence.
For example, an extension cable of 20 m is connected directly to a DCN socket of the central
control unit. To the extension cable, a trunk splitter is connected. To each tap-off socket of
the trunk splitter, an extension cable is connected. One extension cable has a length of 10 m,
the other extension cable has a length of 40 m. The length of the longest extension cable
sequence is, in this example: 20 + 40 = 60 m.
4.1.6
Conference System Planning | en 69
Bosch Security Systems B.V. Operation Manual 2013.11 | V2.0 | DCN-NG_OM_V4.x