Operating Instructions

Optional Accessories
Zero Phase Reactors
405 | 443
If the cable length is too long, the stray capacitance between cables increases and may cause leakage current. In
this case, It activates the over-current protection, increases leakage current, or may affect the current display. The
worst case is that it may damage the AC motor drive. If more than one motor is connected to one AC motor drive,
the total wiring length should be the sum of the wiring length from AC motor drive to each motor.
For the 460V models AC motor drive, when you install an overload thermal relay between the drive and the motor
to protect the motor from overheating, the connecting cable must be shorter than 50 m; however, an overload
thermal relay malfunction may still occur. To prevent the malfunction, install an output reactor (optional) to the drive
or lower the carrier frequency setting (see Pr.00-17 Carrier Frequency).
Consequence of the surge voltage on the motor
When a motor is driven by a PWM-type AC motor drive, the motor terminals experience surge voltages (dv/dt) due
to power transistor conversion of AC motor drive. When the motor cable is very long (especially for the 460V
models), surge voltages (dv/dt) may damage the motor insulation and bearing. To prevent this, follow these rules:
Use a motor with enhanced insulation.
Reduce the cable length between the AC motor drive and motor to suggested values.
Connect an output reactor (optional) to the output terminals of the AC motor drive.
See the following tables for the suggested motor shielded cable length. For drive models < 480V, use a motor with
a rated voltage ≤ 500 Vac and an insulation level ≥ 1.35 kV
p-p
in accordance with IEC 60034-17. For the 575V drive
model, use a motor with a rated voltage ≤ 600 Vac and an insulation level ≥ 1.79 kV
p-p
in accordance with IEC
60034-25.
110V Single-phase
Drive Model
Normal Duty
Rated Current
[Arms]
Without an AC Output Reactor
With an AC Output Reactor
Shielded Cable
[meter]
Non-shielded Cable
[meter]
Shielded Cable
[meter]
Non-shielded
Cable [meter]
RT0002-11N
1.8
50
75
75
115
RT0005-11N
2.7
RT001X-11N
5.5
230V Single-phase
Drive Model
Normal Duty
Rated Current
[Arms]
Without an AC Output Reactor
With an AC Output Reactor
Shielded Cable
[meter]
Non-shielded Cable
[meter]
Shielded Cable
[meter]
Non-shielded
Cable [meter]
RT0002-21N
RT0002-21F
1.8
50
75
75
115
RT0005-21N
RT0005-21F
3.2
RT001X-21N
RT001X-21F
5
50
75
75
115
RT002X-21N
RT002X-21F
8.5
RT003X-21N
RT003X-21F
12.5
230V Three-phase
Drive Model
Normal Duty
Rated Current
[Arms]
Without an AC Output Reactor
With an AC Output Reactor
Shielded Cable
[meter]
Non-shielded Cable
[meter]
Shielded Cable
[meter]
Non-shielded
Cable [meter]
RT0002-23N
1.8
50
75
75
115
RT0005-23N
3.2
RT001X-23N
5