ChallengerPlus Installation and Quick Programming Manual
3
System earthing
The following requirements are essential to the reliable operation of the
Challenger system.
• Each device’s GND link (if applicable) must be removed.
• Connect the earth conductor from the 240/16 VAC plug pack earth to the
Challenger panel’s earth terminal (Figure 5 on page 11, item 3).
• Some Challenger devices have an earth lug (or stud) on the PCB and are
fitted with a
link labelled “GND” or “EARTH”. In such cases, the device’s GND
or EARTH link must be removed. When configured correctly, there will be a
resistance value greater than 100 kΩ between the device’s earth lug (or stud),
or power earth terminal (similar to Figure 5 on page 11
, item 3), and any “C”
or “0V” terminal on the device.
• Install LAN isolation devices between multiple buildings and maintain
independent earthing systems. For example, use TS0893, TS0894, or
TS0896 Isolation Interface modules to provide electrical isolation and/or to
extend distance.
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 7.
Guidelines for retrofitting a Challenger V8 system
When replacing a Challenger V8 panel with a Challenger
Plus
panel in an existing
installation:
• Where used, a device’s GND or EARTH link must be removed (if fitted).
Note:
Challenger
Plus
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 5 on page 11, 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 5 on page 11, 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:
