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3.4 Main Circuit Wiring
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Main Circuit Terminal Power Supply and Motor Wiring
This section outlines the various steps, precautions, and checkpoints for wiring the main
circuit terminals and motor terminals.
N
OTICE: 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.
N
OTICE: Do not connect phase-advancing capacitors or LC/RC noise lters to the output circuits. Improper application
of noise lters could result in damage to the drive.
N
OTICE: Do not connect the AC power line to the output motor terminals of the drive. Failure to comply could result in
death or serious injury by re as a result of drive damage from line voltage application to output terminals.
■
Cable Length Between Drive and Motor
When the cable length between the drive and the motor is too long (especially at low
frequency output), note that the cable voltage drop may cause reduced motor torque. 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 the following table. If the motor wiring
distance exceeds 100 m because of the system conguration, reduce the ground currents.
Refer to Table 3.5 to set the carrier frequency to an appropriate level.
Table 3.5 Cable Length Between Drive and Motor
Cable Length 50 m or less 100 m or less Greater than 100 m
Carrier Frequency 15 kHz or less 5 kHz or less 2 kHz or less
Note: When setting carrier frequency, calculate the cable length as the total distance of wiring to all connected
motors when running multiple motors from a single drive.
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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. 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 or less,
400 V Class: Ground to 10 Ω or less). Improper equipment grounding could result in death or serious injury by contacting
ungrounded electrical equipment.
N
OTICE: 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.
N
OTICE: When using more than one drive, ground multiple drives according to instructions. Improper equipment
grounding could result in abnormal operation of drive or equipment.
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