Select the correct wires for main circuit wiring.
Refer to Main Circuit Wire Gauges and Tightening Torques for wire gauges and tightening torques as specified by European standards.
Refer to Main Circuit Wire Gauges and Tightening Torques for wire gauges and tightening torques as specified by UL standards.
Wire Selection Precautions
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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 mm 2 (copper wire) or 16 mm 2 (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.
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Think about line voltage drop before selecting wire gauges. Select wire gauges that drop the voltage by 2% or less of the rated voltage. Increase the wire gauge and the cable length when the risk of voltage drops increases. Calculate line voltage drop with this formula:
Line voltage drop (V) = 
× wire resistance (Ω/km) × wiring distance (m) × motor rated current (A) × 10-3.
Precautions during Wiring
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Use terminals B1 and - to connect braking units to drives that have built-in braking transistors (models 2004 to 2138 and 4002 to 4168). Use terminals +3 and - to connect braking units to drives that do not have built-in braking transistors.
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Refer to “Yaskawa AC Drive Option Braking Unit, Braking Resistor Unit Instruction Manual (TOBPC72060001)” for information about wire gauges and tightening torques to connect braking resistor units or braking units.
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Use terminals +1 and - to connect a regenerative converter or regenerative unit.
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Fire Hazard
Do not connect a braking resistor to terminals +1 or -. Use terminals B1 and B2 for the braking resistor connections.
If you connect a braking resistor to the incorrect terminals, it can cause damage to the drive and braking circuit and serious injury or death.
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