Clipsal C-Bus Bedienerhandbuch Seite 31

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1250SM0904R10/09 C-Bus™ Basic Programming
10/2009 C-Bus™ Products Training Course
© 2009 Schneider Electric. All Rights Reserved. 25
The extra copper provided by the second conductor to reduce voltage
drop.
The extra copper provided by the second conductor to allow the
maximum current rating of the C-Bus network to be achieved.
C-Bus Cable
Remote ON
C-Bus Positive Voltage
C-Bus Negative Voltage
Remote OFF
Figure 16 - C-Bus cable pairs
For a manual override control of C-Bus, the Remote Override pairs may be
used to send a high priority message to C-Bus. This will lock all of the
channels of any output unit (with all four pairs connected) on or off.
The Remote Overrides operate as follows:
To force a Remote ON, the C-Bus Remote ON pair needs to be shorted
to the C-Bus Negative pair
To force a Remote OFF, the C-Bus Remote OFF pair needs to be
shorted to the C-Bus Negative pair.
NOTE: If both the Remote ON and Remote OFF pairs are shorted to the
C-Bus Negative Voltage pair, the Remote OFF will take priority.
It is critical that the pairs used for the C-Bus positive and negative voltages
are not the natural twisted pairs. Failure to terminate the cable as specified
may result in:
a short circuit on the C-Bus cable
all channels on Output units being locked on or off due to the Remote
Overrides.
Cable Current
Each conductor in the C-Bus cable is capable of carrying 1 Amp of current.
As the conductors are doubled up for C-Bus Positive and Negative, this
effectively doubles the current carrying capacity of the C-Bus cable. This
means that the Category 5 cable is capable of carrying 2 Amps of C-Bus
current.
Cable Terminations
The C-Bus cable is commonly terminated three ways:
by twisting the bare copper ends of the conductors together
by crimping them in an RJ45 plug (in accordance with the 568A wiring
standard)
by screwing down the cable into the terminals of a terminal block (on
selected C-Bus units).
For secure terminations, a bootlace crimp may also be used to terminate
C-Bus cables.
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