6 Challenger Series Installation and Quick Programming Manual
• In each segment of LAN cabling, connect one end only of the data cable
shield to a device’s LAN earth terminal. Join data cable shields where cable
extends past a device that doesn’t have a LAN earth connection.
• The length of the LAN cable run should not exceed 1.5 km, unless LAN
isolation devices are used to extend the distance.
Power supply to RS-485 LAN devices
Devices on the LAN may be supplied from the panel’s or DGP’s + and – LAN
power terminals. Use an external 12 V power supply (such as TS0073 2 A Power
Supply) when:
• The device is more than 100 m (data cable length) from the panel
• Electrical isolation is required
• More power is needed than can be provided by the LANs
When powering a LAN device from an external 12 V power supply:
• Connect the external power supply’s ‘+’ terminal to the device’s ‘+’ terminal.
Do not connect the power supply + to the LAN +.
• Connect the external power supply’s ‘-’ terminal to the device ‘-’ terminal.
• Connect the LAN cable black wire ‘-’ to the device ‘-’ terminal.
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