Mitsubishi Electric 700 Series Installation Manualline page 13

3.2.2 Maximum permissible motor wiring length
The maximum permissible length of the motor cables depends on the capacity of the inverter and the selected carrier
frequency. (The wiring lenght should be 100 m maximum with vector control).
The lengths in the following table are for unshielded cables. When shielded cables are use divide the values listed in the
table by 2. Note that the values are for the total wiring length – if you connect more than one motor in parallel you must
add the lengths of the individual motor cables.
Setting of Pr. 72 PWM Frequency selection
(carrier frequency)
2 (2 kHz) or less
3 (3 kHz), 4 (4 kHz)
5 (5 kHz) to 9 (9 kHz)
10 (10 kHz) or more
Note
For the 01800 or more, the setting range of Pr. 72 PWM frequency selection is "0 to 6".
Note that the motor windings in three-phase AC motors are subject to far more stress when operated via frequency
inverters than with mains operation. The motor must have been approved by the manufacturer for operation on a
frequency inverter.
CAUTION
Especially for long-distance wiring (particularly when employing shielded motor cables), the inverter may be affected by a charging
current caused by the stray capacitances of the wiring, leading to a malfunction of the overcurrent protective function or fast response
current limit function or a malfunction or fault of the equipment connected on the inverter output side.
When the fast-response current limit function malfunctions, make the function invalid. (For Pr.156 Stall prevention operation selection,
refer to the Instruction Manual (applied).)
For details of Pr. 72 PWM frequency selection, refer to the Instruction Manual (applied).
(When using an option sine wave filter (MT-BSL/BSC) for the 02160 or more, set parameter 72 to „25" (2.5 kHz).
3.2.3 Cable size of the control circuit power supply (terminals R1/L11, S1/L21)
Terminal srew size: M4
2
Cable size: 0.75mm to2 mm
Tightening torque: 1.5Nm
2
00023 00038
300 m 500 m
200 m 300 m
100 m
50 m
WIRING
≥
00052
500 m
500 m
9