Functions of the inputs of the 3KC6 transfer switching equipment

Pin 207: Control terminal for inputs 208 – 210

Input 207 is used as the control terminal for inputs 208 – 210.

Pin 208: Command for switching to position 0

Closing of this contact has the result that the transfer switching equipment is switched to the 0 position. Before this command can be activated, pin 208 must be closed with pin 207 and the following conditions must be fulfilled:

  • The cover is closed and

  • The sources are available as described below:

    • If the transfer switching equipment is in position I, at least source II must be available.

    • If the transfer switching equipment is in position II, at least source I must be available.

When the command is active, the transfer switching equipment also changes to the fault state (warning LED is illuminated) and automatic operation via the integrated control unit is deactivated. The "Auto" LED remains unchanged (illuminated if the cover is closed).

The following steps must be performed in order to deactivate the command, rectify the fault state and reactivate automatic mode:

  • Open the connection between pins 207 and 208 and

  • Open the cover and close it again, or connect pin 207 to pin 210 for > 2 seconds and then disconnect it again (also possible via remote operation).

After this, the warning LED must be extinguished and automatic mode must be reactivated as soon as the cover is closed.

Pin 209: Selection of source priority

If contact 209 is open, source I has a higher priority.

Closing this contact with control terminal 207 results in source II being prioritized.

Please note that the priority setting at pin 209 only has an effect when the fourth DIP switch is in the "G" position (with priority). Changes to the DIP switches do not take effect until the cover is opened and closed, see section titled Step 2: Setting DIP switches .

Pin 210: Inhibition of automatic mode

Closing this contact with control terminal 207 results in deactivation of automatic mode and the "Auto" LED is extinguished. The warning LED is unaffected by this.