2.5.3 Applicable cables and wiring length Select a recommended cable size to ensure that the voltage drop will be 2% or less. If the wiring distance is long between the inverter and motor, the voltage drop in the main circuit will cause the motor torque to decrease especially at a low speed. The following table shows a selection example for the wiring length of 20 m. • Three-phase 400 V class • Single-phase 200V class *1 It is the gauge of a cable with the continuous maximum permissible temperature of 75°C (HIV cable (600 V grade heat-resistant PVC insulated wire), etc.). It assumes a surrounding air temperature of 50°C or lower and the wiring distance of 20 m or shorter.
*2 It is the gauge of the cable with continuous maximum permissible temperature of 75°C (THHW cable). It assumes a surrounding air temperature of 40°C or lower and the wiring distance of 20 m or shorter. (Selection example mainly for use in the United States.) *3 When using a single-phase power input model, terminals are R/L1 and S/L2. *4 It is the gauge of a cable with the continuous maximum permissible temperature of 70°C (PVC cable). It assumes a surrounding air temperature of 40°C or lower and the wiring distance of 20 m or shorter.
(Selection example mainly for use in Europe.) *5 It indicates the size of screw for terminals R/L1, S/L2, T/L3, U, V, W, P/+, and N/- and a terminal for earthing (grounding). The line voltage drop can be calculated by the following formula: Ч wire resistance [mΩ/m] Ч wiring distance [m] Ч current [A] 3 Line voltage drop [V] = 1000 Use a larger diameter cable when the wiring distance is long or when it is desired to decrease the voltage drop (torque reduction) in the low speed range. • Tighten the terminal screw to the specified torque. A screw that has been tightened too loosely can cause a short circuit or malfunction.
• Use crimp terminals with insulation sleeves to wire the power supply and motor. A screw that has been tightened too tightly can cause a short circuit or malfunction due to the unit breakage. Total wiring length With induction motor Connect one or more general-purpose motors within the total wiring length shown in the following table. 32 2. INSTALLATION AND WIRING 2.5 Main circuit terminals Applicable inverter model FR-CS84-[] Terminal screw size*5 Tightening torque N·m Crimp terminal Cable gauge HIV cables, etc. (mm2)*1 AWG/MCM*2 PVC cables, etc.
(mm2)*4 R/L1, S/L2, T/L3*3 U, V, W R/L1, S/L2, T/L3*3 U, V, W Earthing (grounding) cable R/L1, S/L2, T/L3*3 U, V, W R/L1, S/L2, T/L3*3 U, V, W Earthing (grounding) cable 012, 022 M4 1.2 2-3.5 2-3.5 2 2 2 14 14 2.5 2.5 2.5 036 to 080 M4 1.5 2-4 2-4 2 2 2 14 14 2.5 2.5 2.5 120 M4 1.5 5.5-4 2-4 3.5 2 3.5 12 14 4 2.5 4 160 M4 1.5 5.5-4 5.5-4 3.5 3.5 3.5 12 12 4 4 4 230 M4 2.5 8-5 8-5 8 8 5.5 8 8 10 6 10 295 M4 2.5 8-5 8-5 8 8 5.5 8 8 10 10 10 Applicable inverter model FR-CS82S-[] Terminal screw size*5 Tightening torque N·m Crimp terminal Cable gauge HIV cables, etc. (mm2)*1 AWG/MCM*2 PVC cables, etc.
(mm2)*4 R/L1, S/L2, T/L3*3 U, V, W R/L1, S/L2, T/L3*3 U, V, W Earthing (grounding) cable R/L1, S/L2, T/L3*3 U, V, W R/L1, S/L2, T/L3*3 U, V, W Earthing (grounding) cable 025, 042 M3.5 1.2 2-3.5 2-3.5 2 2 2 14 14 2.5 2.5 2.5 070 M4 1.5 2-4 2-4 2 2 2 14 14 2.5 2.5 2.5 100 M4 1.5 5.5-4 2-4 3.5 2 3.5 12 14 4 2.5 4 NOTE Cable type Model FR-CS84-[] Model FR-CS82S-[] 012 022 036 050 080 120 160 230 295 025 042 070 100 Unshielded 50 m 50 m 50 m 50 m 50 m 100 m 100 m 100 m 100 m 50 m 50 m 50 m 50 m Shielded 25 m 25 m 50 m 50 m 50 m 100 m 100 m 100 m 100 m 25 m 25 m 50 m 50 m