The RLK0030 serves as control module with manual override function for controlling one 3-speed motor. There is a rotary switch for the functions "Auto"-"Off"-"Man" and a second switch for each speed 1- 3. There is an separate layer for the "Auto", "Off" and "Man" positions, in order to indicate manual override to the DDC. To signal the status "Running", 3 green LEDs are installed (e.g. feedback from the power contactor 24V DC / AC). There is also a red LED for an error message available that will cause a collective fault when wired with the central module RSM. The LEDs are driven with + 24V DC / AC. You can drive power contactors directly with potential free contacts (note contact load instructions). In switch position "Auto" the relays are controlled by the DDC / PLC + 24V DC / AC. If the DDC fails, you can control the system by means of switches. You can test the lamps with the RSM module connected via the 5-pole bus cable.