Delta C2000 Series User Manual page 90

If the length is too long, the stray capacitance between cables will increase and may cause leakage current. It
will activate the protection of over current, increase leakage current or not insure the correction of current
display. The worst case is that AC motor drive may damage.
If more than one motor is connected to the AC motor drive, the total wiring length is the sum of the wiring length
from AC motor drive to each motor.
For the 460V series AC motor drive, when an overload relay is installed between the drive and the motor to
protect motor over heating, the connecting cable must be shorter than 50m. However, an overload relay
malfunction may still occur. To prevent the malfunction, install an output reactor (optional) to the drive or lower
the carrier frequency setting (Pr.00-17).
NOTE
When a thermal O/L relay protected by motor is used between AC motor drive and motor, it may malfunction
(especially for 460V series), even if the length of motor cable is only 165 ft (50m) or less. To prevent it, please use AC
reactor and/or lower the carrier frequency (Pr. 00-17 PWM carrier frequency).
Chapter 7 Optional Accessories C2000 Series
7-15