This section outlines the various steps, precautions, and checkpoints for wiring the main circuit terminals and motor terminals. image/svg+xml Warning image/svg+xml Fire Hazard Do not connect main power supply wiring to drive motor terminals U/T1, V/T2, and W/T3. Connect main power supply wiring to main circuit input terminals R/L1, S/L2, and T/L3. Incorrect wiring can cause serious injury or death from fire. image/svg+xml Warning image/svg+xml Sudden Movement Hazard Make sure that you align the phase order for the drive and motor when you connect the motor to drive output terminals U/T1, V/T2, and W/T3. If the phase order is incorrect, it can cause the motor to run in reverse. If the motor accidentally runs in reverse, it can cause serious injury or death. Notice image/svg+xml Do not connect phase-advancing capacitors, LC/RC noise filters, or leakage breakers (ELCB) to the motor circuit. If you connect these devices to the output circuits, it can cause damage to the drive and connected equipment. Cable Length Between Drive and Motor When the wiring between the drive and the motor is too long, voltage drop along the motor cable can decrease motor torque, usually at low frequency output. If you connect motors in parallel with long motor cable, this is also a problem. Drive output current increases when the leakage current from the cable increases. An increase in leakage current can cause overcurrent and decrease the precision of the current detection. Use the values in Table 1 to adjust the drive carrier frequency. For systems that have 100 m (328 ft) or longer motor wiring, if you use metal conduits or isolated cables for each phase, it will increase stray capacitance. Table 1. Carrier Frequency against Cable Length Between Drive and Motor Wiring Distance Between the Drive and Motor 50 m (164 ft) Maximum 100 m (328 ft) Maximum More than 100 m (328 ft) Carrier Frequency 15 kHz or less 5 kHz or less 2 kHz or less Note: To set the carrier frequency in a drive that is operating more than one motor, calculate the cable length as the total distance of wiring to all connected motors. When A1-02 = 5, 6 [OLV/PM, AOLV/PM], the maximum cable length is 100 m (328 ft). When you connect to a PM motor, it can be necessary to adjust the overcurrent detection. Refer to L8-27: Overcurrent Detection Gain for more information. Ground Wiring Follow the precautions to wire the ground for one drive or a series of drives. image/svg+xml Warning image/svg+xml Crush Hazard Make sure that the protective ground wire complies with technical standards and local safety regulations. The IEC/EN 61800-5-1 standard specifies that you must wire the power supply to automatically de-energize when the protective ground wire disconnects. You can also connect a protective ground wire that has a minimum cross-sectional area of 10 mm2 (copper wire) or 16 mm2 (aluminum wire). The leakage current of the drive will be more than 3.5 mA in drive models; 2xxxB 2xxxC 4002B to 4371B 4002C to 4371C (with built-in EMC filter turned ON) 4389 to 4H12 If you do not obey the standards and regulations, it can cause serious injury or death. image/svg+xml Warning image/svg+xml Electrical Shock Hazard Ground the neutral point on the power supply of drive models 2xxxB/C and 4xxxB/C to comply with the EMC Directive before you turn on the EMC filter. If you turn ON the EMC filter, but you do not ground the neutral point, it can cause serious injury or death. image/svg+xml Warning image/svg+xml Electrical Shock Hazard Use a ground wire that complies with technical standards on electrical equipment and use the minimum length of ground wire. Incorrect equipment grounding can cause serious injury or death from dangerous electrical potentials on the equipment chassis. image/svg+xml Warning image/svg+xml Electrical Shock Hazard Correctly ground the ground terminals. Obey federal and local electrical wiring codes for correct grounding methods. The maximum grounding resistance is 200 V class: ground to 100 Ω or less 400 V class: ground to 10 Ω or less If you touch electrical equipment that is not grounded, it can cause serious injury or death. Note: Only use the drive grounding wire to ground the drive. Do not share the ground wire with other devices such as welding machines or large-current electrical equipment. Incorrect equipment grounding can cause drive or equipment malfunction from electrical interference. To connect more than one drive to the same grounding circuit, follow the instructions in the instruction manual. Incorrect equipment grounding can cause drive or equipment malfunction from electrical interference. When you connect more than one drive, refer to Figure 1. Do not loop the grounding wire. Figure 1. Wiring More than One Drive Wiring the Main Circuit Terminal Block image/svg+xml Warning image/svg+xml Electrical Shock Hazard Before you wire the main circuit terminals, make sure that MCCB and MC are OFF. If you touch electrical equipment when MCCB and MC are ON, it can cause serious injury or death.