Delta VFD1A6ME21ANNAA User Manual

Chapter 7 Optional AccessoriesME300
7-20
Length of the Motor Cable
1. Leakage current affects the motor and remedies
Due to larger parasitic capacitances in longer motor cables, longer cables increase the leakage
current. This can activate the over-current protection and display the incorrect current. In the worst
case, it can damage the drive. If more than one motor is connected to the AC motor drive, the total
motor cable length is the sum of the cable length from AC motor drive to each motor.
For 460V series AC motor drives, when an overload relay is installed between the drive and the
motor to protect the motor from overheating, the connecting cable must be shorter than 50 m. However,
the overload relay could still malfunction. To prevent this, install an AC output reactor (optional) to the
drive and/or lower the carrier frequency setting (Pr.00-17).
2. Surge voltage affects the motor and remedies
When a PWM signal from an AC motor drive drives the motor, the motor terminals can easily
experience surge voltages (dv/dt) due to IGBT switching and cable capacitance. When the motor
cable is very long (especially for the 460V series), surge voltages (dv/dt) may reduce motor insulation
quality. To prevent this situation, follow the rules listed below.
a. Use a motor with enhanced insulation.
b. Connect an output reactor (optional) to the output terminals of the AC motor drive.
c. Reduce the motor cable length to the values in the table below.
The suggested motor shielded cable length in the following table complies with IEC 60034-17,
which is suitable for motors with a rated voltage ≤ 500 V
AC
and with an insulation level of ≥ 1.35 kV
p-p
.
115V One-phase
Model
Without AC reactor With AC reactor
Shielded Cable
[meter]
Non-shielded cable
[meter]
Shielded Cable
[meter]
Non-shielded cable
[meter]
VFD0A8ME11ANNAA
VFD0A8ME11ANSAA
50 75 75 115
VFD1A6ME11ANNAA
VFD1A6ME11ANSAA
VFD2A5ME11ANNAA
VFD2A5ME11ANSAA
VFD4A8ME11ANNAA
VFD4A8ME11ANSAA
230V One-phase
Model
Without AC reactor With AC reactor
Shielded Cable
[meter]
Non-shielded cable
[meter]
Shielded Cable
[meter]
Non-shielded cable
[meter]
VFD0A8ME21ANNAA
VFD0A8ME21AFNAA
VFD0A8ME21ANSAA
VFD0A8ME21AFSAA
50 75 75 115
VFD1A6ME21ANNAA
VFD1A6ME21AFNAA
VFD1A6ME21ANSAA
VFD1A6ME21AFSAA
VFD2A8ME21ANNAA
VFD2A8ME21AFNAA
VFD2A8ME21ANSAA
VFD2A8ME21AFSAA

Delta VFD1A6ME21ANNAA Specifications

General

Brand	Delta
Model	VFD1A6ME21ANNAA
Category	DC Drives
Language	English