Mitsubishi Electric 800 Series Instruction Manual page 42

Total wiring length
 With induction motor
Connect one or more induction motors within the total wiring length shown in the following table. (The wiring length should be
100 m or shorter under vector control.)
Total wiring length (FR-A860-00320 or higher)
• When fast response current limit is enabled (Pr.156 = "0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, or 30"), the
wiring length should be within the value in the table below.
• ND/HD rated
Pr.72 setting
(carrier frequency)
2 (2 kHz) or less
3 (3 kHz) or more
• LD/SLD rated
Pr.72 setting
FR-A860-00027
(carrier frequency)
2 (2 kHz) or less 100 m
3 (3 kHz) or more 100 m
• When fast response current limit is disabled (Pr.156 = "1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, or 31"), the
wiring length should be within the value in the table below.
FR-A860-00027 FR-A860-00061
100 m 300 m
• Use a "600 V class inverter-driven insulation-enhanced motor" and set frequency in Pr.72 PWM frequency selection
according to wiring length.
Wiring length 50 m or shorter
15 (14.5 kHz) or lower
 With PM motor
The wiring length should be 100 m or shorter when connecting a PM motor.
Use one PM motor for one inverter. Multiple PM motors cannot be connected to an inverter.
When the wiring length exceeds 50 m for a 600 V class motor driven by an inverter under PM sensorless vector control,
set "9" (6 kHz) or less in Pr.72 PWM frequency selection.
NOTE
• Especially for long-distance wiring, the inverter may be affected by a charging current caused by stray capacitances of the
wiring, leading to an activation of the overcurrent protection, malfunction of the fast-response current limit operation, or even
to an inverter failure. It may also cause a malfunction or fault of the equipment connected ON the inverter output side. If the
fast-response current limit function malfunctions, disable this function. (Refer to Pr.156 Stall prevention operation
selection on page
• For the details of Pr.72 PWM frequency selection, refer to
• Refer to page 73
• The carrier frequency is limited during PM sensorless vector control. (Refer to
500 m or less
FR-A860-00027
100 m 300 m
100 m 200 m
FR-A860-00061
200 m
100 m
FR-A860-00090
500 m
Wiring length 50 m to 100 m
9 (9 kHz) or lower
332.)
to drive a 600 V class motor by an inverter.
300 m
300 m
300 m + 300 m = 600 m
FR-A860-00061 FR-A860-00090
300 m
300 m
FR-A860-00090 FR-A860-00170
300 m 500 m
200 m 400 m
FR-A860-00170
or higher
500 m
Wiring length longer than 100 m
4 (4 kHz) or lower
page 261.
page
INSTALLATION AND WIRING
Main circuit terminals
FR-A860-00170
or higher
500 m
500 m
FR-A860-00320
or higher
500 m
500 m
261.)
2
41