9
(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.
100V, 200V class
400V class
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 thhe surge voltage suppression filter (FR-ASF-H/FR-BMF-H) on the inverter output side.
Pr. 72 PWM frequency selection
setting
(carrier frequency)
008
014
025
042
070
or Higher
1 (1kHz) or less
200m
(656.19 feet)
200m
(656.19 feet)
300m
(984.25 feet)
500m
(1640.42 feet)
500m
(1640.42 feet)
2 to15
(2kHz to 14.5kHz)
30m
(98.42 feet)
100m
(328.08 feet)
200m
(656.19 feet)
300m
(984.25 feet)
500m
(1640.42 feet)
Pr. 72 PWM frequency selection
setting
(carrier frequency)
012
022
036
050
080
or Higher
1 (1kHz) or less
200m
(656.19 feet)
200m
(656.19 feet)
300m
(984.25 feet)
500m
(1640.42 feet)
500m
(1640.42 feet)
2 to15
(2kHz to 14.5kHz)
30m
(98.42 feet)
100m
(328.08 feet)
200m
(656.19 feet)
300m
(984.25 feet)
500m
(1640.42 feet)
Total wiring length (FR-D720-070 or higher, FR-D720S-070 or higher, FR-D740-080 or higher)
Wiring Length
50m(164.04feet) or
less
50m(164.04feet) to
100m(328.08feet)
Exceeding
100m(323.08feet)
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 4 of the Instruction Manual)
y
Refer to Chapter 4 of the Instruction Manual
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 below,
select without frequency search (
Pr. 162
= "1, 11").
(
Refer to Chapter 4 of the Instruction Manual)
500m
(1640.42feet)
or less
300m
(984.25feet)
300m
(984.25feet)
300m(984.25feet) + 300m(984.25feet)
= 600m(1968.50feet)
Motor capacity
(kW(HP))
0.1K(1/8)
0.2K(1/4)
0.4K(1/2)
Wiring length
20m(65.61feet)
50m(164.04feet)
100m(323.08feet)
