The RPK series .... serve as control modules with manual override function for control of one to four 1-speed motors. There is a rotary switch for each drive with "Auto"-"Off"-"Man". There is an extra layer for the "Auto"-Position, in order to indicate manual overwrite to the DDC. In Order to get this indication in the porsitions "Off" and "Man" you have to put an"-H0" at the end of the typ-Code (e.g. RPK2020-H0). To signal the status "Running" green LEDs are installed. For error messages red LEDs are available that produce 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 a potential free contact (note contact load instructions). In switch position "Auto" the relais are controlled from 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. RPK0010 - 1 drive RPK1010 - 2 drives RPK1020 - 3 drives RPK2020 - 4 drives