Limit switches and emergency switch have to be connected to the terminals at green LCPI module. Please refer to the schematics for the exact cabling. The limit switch inputs internally are connected to the external 24V / GND rails. The switches are connected directly to the input pairs without any external ground or supply cabling. The ACU treats a closed contact as OK, contacts have to be opened to indicate the ‘limit reached’ or ‘emergency stop’ condition. Opening the emergency stop contact disconnects the frequency inverters, motor drivers or conductors from mains supply immediately. If you have proximity switches, the LCPI module also provides power supply terminals, refer to the schematics for proper connection. Use ‘PNP’ types as these correspond with ‘NC’ types of standard switches.