You must provide low voltage wiring as specified by the National Electric Code (NEC), the Canadian Electric Code, Part I (CEC), and local codes. Yaskawa recommends the NEC class 1 circuit conductor. Use the UL approved class 2 power supply for external power supply. Table 1. Control Circuit Terminal Power Supplies Input/Output Terminals Power Supply Specifications Digital input S1 to S7, SN, SC, SP Uses the LVLC power supply in the drive. Use the UL Listed class 2 power supply for external power supply. Analog input A1, A2, AC ,+V Uses the LVLC power supply in the drive. Use the UL Listed class 2 power supply for external power supply. Analog output AM, AC Uses the LVLC power supply in the drive. Pulse train output MP, AC Uses the LVLC power supply in the drive. Use the UL Listed class 2 power supply for external power supply. Pulse train input RP, AC Uses the LVLC power supply in the drive. Use the UL Listed class 2 power supply for external power supply. Safe disable input H1, H2, HC Uses the LVLC power supply in the drive. Use the UL Listed class 2 power supply for external power supply. Serial communication input/output D+, D-, AC Uses the LVLC power supply in the drive. Use the UL Listed class 2 power supply for external power supply. 24 V external power supply PS, AC Use the UL Listed class 2 power supply.