Mitsubishi Electric FR-A700 EC, Instruction Manual

Page: 53 / 826

Wiring Main circuit connection
FR-A700 EC 3 - 15
Total wiring lenght
The maximum possible length of the motor cables depends on the capacity of the inverter and
the selected carrier frequency. The cables should never be longer than 100m (unshielded).
The lengths in the following table are for unshielded cables. When shielded cables are use di-
vide 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.
Pr. 72 "PWM frequency selection" setting (carrier frequency) 00023 00038
≥
00052
≤
2 (2kHz) 300m 500m 500m
3 (3kHz), 4 (4kHz) 200m 300m 500m
5 (5kHz) to 9 (9kHz) 100m
≥
10 (10kHz) 50m
Tab. 3-5: Total wiring lenght
NOTE For the 02160 or more, the setting range of Pr. 72 PWM frequency selection is "0 to 6".
Fig. 3-7:
Total wiring lenght (00052 or more)
I001017E
NOTE Note that the motor windings are subjected to significantly higher loads when the motor is
operated by inverter than with normal mains operation. The motors must be approved for
inverter operation by the manufacturer (refer also to section 3.9.5).
≤
500m
300m
300m
300m + 300m = 600m