Chapter 7 Optional AccessoriesMH300
Delta’s Part No. -
A B C D E R
DR004D1403 79 92 112 64±2 69.5±2 9.5*5.5
DR006D0935 79 92 112 64±2 69.5±2 9.5*5.5
DR009D0623 79 112 112 64±2 89.5±2 9.5*5.5
DR010D0534 99 93 128 79±2 70±2 9.5*5.5
DR012D0467 99 105 128 79±2 82.5±2 9.5*5.5
DR018D0311 117 110 144 95±2 87±2 10*6.5
DR024D0233 117 120 144 95±2 97±2 10*6.5
DR032D0175 117 140 157 95±2 116.5±2 10*6.5
DR038D0147 136 135 172 111±2 112±2 10*6.5
DR045D0124 136 135 173 111±2 112±2 10*6.5
DR060DP935 136 150 173 111±2 127±2 10*6.5
Table 7-45
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 the AC motor drive to each motor.
For 460V models 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 models), surge voltages (dv/dt) may reduce motor insulation
quality. To prevent this, 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
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