Charlie Crackle
22 Sep 04, 01:00 AM
Could some one please state what the BEST design is in terms of running CBUS Cable.
1) Is it better (if possible) to have just one long length with all the devices spread over this length (ie no branches or 3 way connections)
Some times this is achievable but may make the bus longer. Is it better to have a shorter bus and lots of branches on the bus. or a longer cable with less branches
2) Have all the power supplies at one end, Some at each end, Spread over the total length of the cable. All in the middle ??
3) Have all the higher current devices (Touch Screen) nearer the power supplies on the cable ??
4) If burden required better at end of cable ?? middle of cable ?? near the power supplies ??
When doing the Power Calculations (Using Cbus Calculator). You work out enough power to supply devices with a small margin. If a Circuit breaker trips and one output module with power supply is effected there may not be enough power on the Cbus network now to power all devices. What happens in this situation ?? Does cbus stop working ?? Do just some modules stop working ?? Is it good design practice to make sure that 1 Circuit breaker failure does not take enough power supples out to cause under power of the cbus network ?? If all circuits on same phase (for dimmer modules) is it good practice to wire the incomming power connections to the modules together on 1 seperate circuit and run the dimmers and relay load circuits on seperate circuits this way a fault on a load circuit will not trip the power supply circuit of the output module?
I am after BEST Practices if you were doing the design to optimise Cbus comunication and least interfearance.
Please add any other best practices..
1) Is it better (if possible) to have just one long length with all the devices spread over this length (ie no branches or 3 way connections)
Some times this is achievable but may make the bus longer. Is it better to have a shorter bus and lots of branches on the bus. or a longer cable with less branches
2) Have all the power supplies at one end, Some at each end, Spread over the total length of the cable. All in the middle ??
3) Have all the higher current devices (Touch Screen) nearer the power supplies on the cable ??
4) If burden required better at end of cable ?? middle of cable ?? near the power supplies ??
When doing the Power Calculations (Using Cbus Calculator). You work out enough power to supply devices with a small margin. If a Circuit breaker trips and one output module with power supply is effected there may not be enough power on the Cbus network now to power all devices. What happens in this situation ?? Does cbus stop working ?? Do just some modules stop working ?? Is it good design practice to make sure that 1 Circuit breaker failure does not take enough power supples out to cause under power of the cbus network ?? If all circuits on same phase (for dimmer modules) is it good practice to wire the incomming power connections to the modules together on 1 seperate circuit and run the dimmers and relay load circuits on seperate circuits this way a fault on a load circuit will not trip the power supply circuit of the output module?
I am after BEST Practices if you were doing the design to optimise Cbus comunication and least interfearance.
Please add any other best practices..