n
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
. If the motor wiring distance exceeds 100 m because of the system
configuration, reduce the ground currents.
Table 3.5 Cable Length Between Drive and Motor
Cable Length
50 m or less
Greater than 50 m
Carrier Frequency
10 kHz or less
4 kHz or less
Note:
When setting carrier frequency for drives running multiple motors, calculate cable length as the total wiring distance to all connected motors.
n
Ground Wiring
Follow the precautions below when wiring 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.
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.
when using multiple drives, do not loop the ground wire.
Figure 3.25 Multiple Drive Wiring
n
Wiring the Main Circuit Terminal
WARNING! Electrical Shock Hazard. Shut off the power supply to the drive before wiring the main circuit terminals. Failure to comply may
result in death or serious injury.
Wire the main circuit terminals after the terminal board has been properly grounded.
Drive Models 2
o
0028 to 2
o
0081 and 4
o
0011 to 4
o
0077 have a cover placed over terminals p1 and n1 prior to shipment
to help prevent miswiring. Use wire cutters to cut away covers as needed for terminals.
3.8 Main Circuit Wiring
72
YASKAWA TOEPYAIUPW01A YASKAWA AC Drive - U1000 iQpump Matrix Drive User Manual