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3.3 Main Circuit Wiring
50 YASKAWA SIEPYEULA5001C LA500 Technical Manual
WARNING! 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.
WARNING! 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: Do not connect phase-advancing capacitors, LC/RC noise filters, or leakage breakers (RCM/RCD) to the motor
circuit. If you connect these devices to the output circuits, it can cause damage to the drive and connected equipment.
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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 3.2 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 3.2 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.
• If the length of the wire between the drive and an induction motor is longer than 100 m (328 ft), set A1-02 = 0 [V/f] .
•
The maximum cable length between the drive and a PM motor is 100 m (328 ft).
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Ground Wiring
Follow the precautions to wire the ground for one drive or a series of drives.
WARNING! Electrical Shock Hazard. Make sure that the protective ground wire complies with technical standards and local
safety regulations. The EN 61800-5-1:2007 standard specifies that you must wire the power supply to automatically de-energize
when the protective ground wire disconnects. If you turn on the internal EMC filter, the leakage current of the drive will be more
than 3.5 mA. Use the closed-loop crimp terminal to connect a protective ground wire that has a minimum cross-sectional area of
10 mm
2
(copper wire). If you do not obey the standards and regulations, it can cause serious injury or death.
WARNING! Electrical Shock Hazard. Ground the neutral point on the power supply of drive models 4xxxE to comply with the
EMC Directive before you turn on the EMC filter or if there is high resistance grounding. If you turn ON the EMC filter, but you do
not ground the neutral point, it can cause serious injury or death.
WARNING! 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.
WARNING! Electrical Shock Hazard.
Correctly ground the ground terminals. Obey federal and local electrical wiring codes for correct grounding methods. The
maximum grounding resistance is
• 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.
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Wiring the Main Circuit Terminal Block
WARNING! 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.
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Main Circuit Configuration
The figures in this section show the different schematics of the drive main circuit. The connections change when
the drive capacity changes. The DC power supply for the main circuit also supplies power to the control circuit.
Note:
Drive models 2018A to 2075A, and 4009A to 4045A do not have a built-in EMC filter.
WARNING! Fire Hazard. Do not connect a braking resistor to ter1 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.