Challenger Series Installation and Quick Programming Manual 5
Earthing of one cabinet containing several devices. All devices designed for
the system have earth connections via metal studs to the metal housing. Take
care that these metal studs have a good connection to bare metal (no paint).
Earthing of panels in a single building. In a single building several cabinets or
devices are earthed. A licensed electrician should check the integrity of the
building earth system.
Earthing of panels in more than one building. If the wiring extends to separate
buildings, use more than one common earth system. Install LAN isolation
devices, such as TS0893, to isolate the system LAN between buildings to protect
the system against differences in earth potential. See Figure 3 on page 9.
Guidelines for retrofitting a Challenger V8 system
When replacing a Challenger V8 panel with a Challenger Series panel in an
existing installation:
• Where used, a device’s GND or EARTH link must be removed (if fitted).
Note: Challenger Series panels do not have a GND link.
• Where 240/16 VAC plug packs are used, connect the earth conductor to the
device’s power earth terminal (similar to Figure 7 on page 15, item 3).
• Connect one end only of the RS-485 data cable shield to a device’s LAN
earth terminal or earth lug (similar to Figure 7 on page 15, item 1).
• All other wiring compliant with Challenger V8 earthing via a Communications
Earth Terminal (CET) may remain unchanged.
Guidelines for new Challenger installations
When installing a Challenger panel in a new installation, follow the wiring
requirements of this manual including:
• Where used, a device’s GND or EARTH link must be removed (if fitted).
Note: Challenger Series panels do not have a GND link.
• Where 240/16 VAC plug packs are used, connect the earth conductor to the
device’s power earth terminal (similar to Figure 7 on page 15, item 3).
• Connect one end only of the RS-485 data cable shield to a device’s LAN
earth terminal or earth lug (similar to Figure 7 on page 15, item 1).
• Connections to building earth via CET are no longer required.
Note: For new installations the earthing and configuration instructions in this
manual supersede all previously-released installation instructions supplied with
other devices (unless otherwise noted).
RS-485 LAN cabling
The cabling requirements for an RS-485 system LAN are:
• Use 2-pair twisted shielded data cable such as Belden 8723.
To Next Page
