Mitsubishi Electric FR-A700 Technical Manual page 125

1.6.8 Wiring common
(common)
After wiring, wire offcuts must not be left in the inverter.
Wire offcuts can cause an alarm, failure or malfunction. Always keep the inverter clean.
When drilling mounting holes in an enclosure etc., take care not to allow chips and other foreign matter to enter the inverter.
Use cables of the size to make a voltage drop 2% maximum.
If the wiring distance is long between the inverter and motor, a main circuit cable voltage drop will cause the motor torque to
decrease especially at the output of a low frequency.
Refer to page 530 for the recommended wire sizes.
The overall wiring length should be 500m or less (within 100m during vector control)
Especially for long distance wiring, the fast-response
current limit function may decrease or the equipment
connected to the output side may malfunction or become
faulty under the influence of a charging current due to the
stray capacity of the wiring. Therefore, note the overall
wiring length.
The overall wiring length for connection of a single motor or
multiple motors should be within the value in the table on
the right. (The wiring length should be 100m maximum for
vector control.)
When driving a 400V class motor by the inverter, surge
voltages attributable to the wiring constants may occur at
the motor terminals, deteriorating the insulation of the
motor. In this case, refer to page 504.
Overall wiring length (example: FR-A720-1.5K)
300m
500m or less
300m
300m
300m = 600m
1)
A700
[Pr. 72 PWM Frequency
Selection] Setting (carrier
frequency)
2 (2kHz) or less
3 to 15 (3kHz to 14.5kHz)
2)
F700
[Pr. 72 PWM Frequency
Selection] Setting (carrier
frequency)
2 (2kHz) or less
3 to 15 (3kHz to 14.5kHz)
3)
E700 D700
[Pr. 72 PWM
Frequency
Selection] 0.1K
Setting (carrier
frequency)
200V
200m 200m 300m 500m 500m 500m 500m
1(1kHz)
class
or less
400V
—
class
2 to 200V
30m 100m 200m 300m 500m 500m 500m
15(2kHz class
to
400V
—
14.5kHz)
class
118
SPECIFICATIONS
0.4K 0.75K
300m 500m
200m 300m
0.75K 1.5K
300m 500m
200m 300m
0.2K 0.4K 0.75K 1.5K 2.2K
200m 200m 300m 500m 500m
—
30m 100m 200m 300m 500m
—
1.5K or
more
500m
500m
2.2K or
more
500m
500m
3.7K
or
more