Main Circuit Terminal And Motor Wiring - YASKAWA U1000 Series Technical Manual

<1> Gauges listed here are for use in Japan.
<2> Gauges listed here are for use in the United States.
<3> Gauges listed here are for use in Europe and China.

◆ Main Circuit Terminal and Motor Wiring

This section outlines the various steps, precautions, and checkpoints for wiring the main circuit terminals and motor
terminals.
NOTICE: When connecting the motor to the drive output terminals U/T1, V/T2, and W/T3, the phase order for the drive and motor
should match. Failure to comply with proper wiring practices may cause the motor to run in reverse if the phase order is backward.
NOTICE: Do not connect phase-advancing capacitors or LC/RC noise filters to the output circuits. Failure to comply could result in
damage to the drive, phase-advancing capacitors, LC/RC noise filters or ground fault circuit interrupters.
■ Cable Length Between Drive and Motor
Voltage drop along the motor cable may cause reduced motor torque when the wiring between the drive and the motor is
too long, especially at low frequency output. This can also be a problem when motors are connected in parallel with a
fairly long motor cable. Drive output current will increase as the leakage current from the cable increases. An increase in
leakage current may trigger an overcurrent situation and weaken the accuracy of the current detection.
Adjust the drive carrier frequency according to
system configuration, reduce the ground currents.
Cable Length
Carrier Frequency
Note: 1. When setting carrier frequency for drives running multiple motors, calculate cable length as the total wiring distance to all connected
motors.
2. The maximum cable length is 100 m when using OLV/PM (A1-02 = 5) or AOLV/PM (A1-02 = 6).
Ground Wiring
■
Follow the precautions to wire the ground for one drive or a series of drives.
WARNING! Electrical Shock Hazard. Always use a ground wire that complies with technical standards on electrical equipment and
minimize the length of the ground wire. Improper equipment grounding may cause dangerous electrical potentials on equipment
chassis, which could result in death or serious injury.
WARNING! Electrical Shock Hazard. Be sure to ground the drive ground terminal (200 V class: ground to 100
Ω
ground to 10 or less). Improper equipment grounding could result in death or serious injury by contacting ungrounded electrical
equipment.
NOTICE: Do not share the ground wire with other devices such as welding machines or large-current electrical equipment. Improper
equipment grounding could result in drive or equipment malfunction due to electrical interference.
NOTICE: When using more than one drive, ground multiple drives according to instructions. Improper equipment grounding could
result in abnormal operation of drive or equipment.
Refer to Figure 3.32 when using multiple drives or when using multiple models CIMR-U40720 to 40930 that are
connected with harmonic filter module. Do not loop the ground wire.
Figure 3.33
YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual
Table 3.9. If the motor wiring distance exceeds 100 m because of the
Refer to C6-02: Carrier Frequency Selection on page
Table 3.9 Cable Length Between Drive and Motor
50 m or less
10 kHz or less
Figure 3.32 Multiple Drive Wiring
3.8 Main Circuit Wiring
228.
Greater than 50 m
4 kHz or less
Ω
or less; 400 V class:
3
97