7
WIRING
(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.
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 the 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 More
1 (1kHz) or less
200m
200m
300m
500m
500m
2 to15
(2kHz to 14.5kHz)
30m
100m
200m
300m
500m
Pr. 72 PWM frequency selection
Setting
(carrier frequency)
012
022
036
050
080
or More
1 (1kHz) or less
200m
200m
300m
500m
500m
2 to15
(2kHz to 14.5kHz)
30m
100m
200m
300m
500m
Total wiring length (FR-D720S-070 or more, FR-D740-080 or more)
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 fast-response current limit malfunctions, disable this function. When the stall prevention function misoperates,
increase the stall level.
(
Refer to Pr. 22 Stall prevention operation level
and
Pr. 156 Stall prevention operation selection in
the chapter 4 of the Instruction Manual)
y
Refer to the chapter 4 of the Instrunction 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 the chapter 4 of the Instruction Manual)
500m or less
300m
300m
300m+300m=600m
Motor capacity
0.1K
0.2K
0.4K
Wiring length
20m
50m
100m
D700_EC_Guideline_ib0600352ENG.book 7 ページ ２００８年４月１０日 木曜日 午後２時６分
