Guntermann & Drunck ControlCenter-Digital-288 Installation And Operation Manual page 63

Status of power supply
The LEDs on the front panel of the matrix switch give information about the
device's power supply:
LED Colour
AC ok Yellow
DC ok Green
All power supply modules provide the following LEDs:
LED Colour
AC Green
DC Green
Red
Meaning
The power supply module is supplied with the required input voltage.
The power supply module supplies the required voltage to the matrix
switch.
Meaning
The power supply module is supplied with the required input voltage.
The power supply module supplies the required voltage to the matrix
switch.
Incorrect output voltage.
The power supply module does not supply voltage to the matrix switch.
Status displays
G&D ControlCenter-Digital-288 · 27