Major 4000897 Manual - Halaman 4

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DMX Input / Output

The control signal (DMX) is fed through the XLR5pol. male socket. The DMX output is

a "feed through" output, which means that the DMX signal will be daisy-chained and

will also be available on the output in case of a power failure. Major PSUs are

designed to put minimum strain on the DMX signal.

Termination

If the Major PSU is the last unit in line (of DMX cabling), the DMX signal must be ter-

minated. Therefore you will find a termination switch on the unit.

If the termination switch is set to ON, the Micro PSU indicates this by the yellow LED

and the MAXI PSU by the flashing red LED.

Output / Return sockets

In order to protect the main DMX signal against negative influences caused by defec-

tive cabling, etc..., it is galvanically separated from the Colour Changer outputs via

opto-isolated coupling inside the PSU.

The outputs to the scrollers are designed as XLR4pol. sockets, which are connected

with the XLR4pol. male socket of the first Colour Changer in line via Major Power/Data

cables. Further scrollers are connected from the XLR4pol. female socket of the first

Colour Changer in line to the second one, etc...

In order to improve current feeding and DMX transmission, we always recommend to

connect a so-called return cable from the last scroller on each output back to the PSU

return socket (XLR4pol. male). This way the supply voltage will be led back again to

the Colour Changer – in parallel to the output. Via an internal termination resistor the

loop cabling is automatically terminated when connecting the return cable.

Protection

Each PSU output is internally protected. The fuse on the PCB inside the Micro PSU is

able to put itself back.

Inside the Maxi PSU you will find so-called "Pico Fuses", which are located on the

PCB. These fuses protect the PCB against damages, which might be caused by

incorrectly assigned or defective scroller cables.

Version: 2.0, 18.11.2011