Variable Transformer EduTrainer - Operating instructions
© Festo Didactic
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6
Safety Sockets
Unless otherwise indicated in the technical data, the following color coding applies for supply and signal
connections on components of the Festo Didactic Automation and Technology Learning System.
Color
Function
Color
Function
Voltage greater than SELV
e.g. supply voltage of 90 to 400 V AC per conductor
external conductor L1
(grey-brown)
24 V DC
(red)
Voltage greater than SELV
e.g. supply voltage of 90 to 400 V AC per conductor
external conductor L2
(grey-black)
0 V DC
(blue)
Voltage greater than SELV
e.g. supply voltage of 90 to 400 V AC per conductor
external conductor L3
(grey-dark grey)
SELV
Signal input/signal output
(black)
Voltage greater than SELV
e.g. supply voltage of 90 to 400 V AC per conductor
external conductor
(grey)
Neutral conductor
(grey-blue)
PE conductor, configuration as 4 mm safety socket
(green-yellow)
Protective grounding terminal as PE+ contact,
delivery status
(green-yellow)
Depending on the type of component, some of the safety sockets listed may not be
present. The circuit design may contain additional safety sockets due to the use of
different components.
The specified protection class and safe use can only be assured if laboratory safety cables supplied by Festo
Didactic are used.