DCN Wireless Installation and User Instructions System Design and Planning
en 17
2.6.4Overload 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
When an overload occurs, the sockets are deactivated and the connected devices do not operate. The socket checks every 8 seconds
2.7Cable lengths
2.7.1Maximum length
The cable length between the central control unit and the furthest device from the central control unit must not be more than 250 m. The cable length includes the device cable and extension cables.
2.7.2To first regenerative tap-off
The total cable length between the central control unit and the first regenerative
2.6.5Extension 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 section 2.7.5).
2.7.3Between regenerative tap-offs
The total cable length between two regenerative
2.7.4Open-ended DCN cables
2.7.5Power correction
2.7.5.1Introduction
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 (refer to figure 2.3) corrects the power level to compensate for the extension cables.
2.7.5.2Calculation
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. Refer to section 2.7.5.3.
•The length of the longest extension cable sequence. Refer to section 2.7.5.4.
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