ABB 6550-500 Manual De Instrucciones página 42

Installation
24 Installation
Extension Input (Operation in Parallel - s. Figs. 2
and 3)
The Memory Pushbutton Controller can be operated via
the extension. In this context, the following is to be noted:
– The maximum line length depends on the maximum
permissible ripplevoltage at the extension inputs.
However, the ripple voltage must not exceed 100 V (in
practice, this corresponds to line lengths of at least
100 m).
– The number of pushbuttons (e.g., 2020US) is unlimited
in the case of a line length of 100 m.
– Illuminated pushbuttons (e.g., 2020USGL) can only be
used with N.
– Contact-parallel illumination is not permissible.
– In order to avoid undesired switching operations, do
not combine the control and load lines in one cable.
The phase of supply input "L" must be the
same as the control phase for extension
input "1" (see Figs. 2 and 3).
ENG 42