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9
Wiring
The line voltage drop can be calculated by the following formula:
Line voltage drop [V]=
Use a larger diameter cable when the wiring distance is long or when it is desired to decrease the voltage drop (torque
reduction) in the low speed range.
(2) Total wiring length
The overall wiring length for connection of a single motor or multiple motors should be within the value in the table below.
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. Take the following measures (1) or (2) in this case.
(1) Use a "400V class inverter-driven insulation-enhanced motor" and set frequency in Pr. 72 PWM frequency selection
according to wiring length.
(2) Connect the surge voltage suppression filter (FR-ASF-H/FR-BMF-H) on the inverter output side.
Pr. 72 PWM frequency selection Setting
(carrier frequency)
0.1K 0.2K 0.4K 0.75K 1.5K 2.2K
3.7K
or Higher
1 (1kHz) or less
200V class 200m 200m 300m 500m 500m 500m 500m
400V class ⎯⎯200m 200m 300m 500m 500m
2 to15
(2kHz to 14.5kHz)
200V class 30m 100m 200m 300m 500m 500m 500m
400V class ⎯⎯30m 100m 200m 300m 500m
Total wiring length (3.7K or higher)
Wiring Length
50m or less 50m to 100m Exceeding 100m
Carrier frequency 14.5kHz or less 8kHz or less 2kHz or less
NOTE
y Especially for long-distance wiring, 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, fast response current limit
function, or stall prevention function or a malfunction or fault of the equipment connected on the inverter output side.
If malfunction of fast-response current limit function occurs, disable this function. If malfunction of stall prevention
function occurs, increase the stall level. ( Refer to Pr. 22 Stall prevention operation level and Pr. 156 Stall prevention
operation selection in Chapter 5 of the Instruction Manual (Applied))
y Refer to Chapter 5 of the Instruction Manual (Applied) for details of Pr. 72 PWM frequency selection. Refer to the manual of
the option for details of surge voltage suppression filter (FR-ASF-H/FR-BMF-H).
y When using the automatic restart after instantaneous power failure function with wiring length exceeding than 100m,
select without frequency search (Pr. 162 = "1 (initial setting) or 11"). (
Refer to Chapter 5 of the Instruction Manual
(Applied))
3 × wire resistance[mΩ/m] × wiring distance[m] × current[A]
1000
500m or less
300m
300m
300m+300m=600m