18
WIRING
2.3.2 Total wiring length
With general-purpose motor
Connect one or more general-purpose motors within the total wiring length shown in the following table.
(The wiring length should be 100 m or less under vector control.)
Total wiring length (FR-A820-00105(1.5K)-R2R or higher, FR-A840-00052(1.5K)-R2R or higher, and FR-A842-R2R)
When driving a 400 V class motor by the inverter, surge voltages attributable to the wiring constants may occur at the motor
terminals, deteriorating the insulation of the motor. In this case, take one of the following measure.
– Use a "400 V class inverter-driven insulation-enhanced motor" and set frequency in Pr. 72 "PWM frequency selection"
according to wiring length.
– Connect the surge voltage suppression filter (FR-ASF-H, FR-BMF-H) to the output side of the FR-A840-01800(55K)-R2R or
lower, and the sine wave filter (MT-BSL, MT-BSC) to the output side of the FR-A840-02160(75K)-R2R or higher.
– If the motor capacity is 280 kW or lower, connect the sine wave filter (MT-BSL/MT-BSC) to the output side of the FR
-
A842-R2R.
2.3.3 Cable size of the control circuit power supply (terminal R1/L11, S1/L21)
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Terminal screw size: M4
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Cable size: 0.75 mm² to 2 mm²
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Tightening torque: 1.5 Nm
Pr. 72 setting
(carrier frequency)
FR-A820-00046(0.4K)-R2R,
FR-A840-00023(0.4K)-R2R
FR-A820-00077(0.75K)-R2R,
FR-A840-00038(0.75K)-R2R
FR-A820-00105(1.5K)-R2R
or higher,
FR-A840-00052(1.5K)-R2R
or higher,
FR-A842-07700(315K)-R2R
to 12120(500K)-R2R
2 (2 kHz) or lower
300 m
500 m
500 m
3 (3 kHz) or higher
200 m
300 m
500 m
Wiring length
50 m
50 m–100 m
100 m
Pr. 72 setting
15
14.5 kHz)
9 (9 kHz)
4 (4 kHz)
FR-A842-R2R:
6
6 kHz)
CAUTION
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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.
(For Pr. 156 "Stall prevention operation selection", refer to the "FR-A800 Instruction Manual (Detailed)".)
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For details of Pr. 72 "PWM frequency selection", refer to the "FR-A800 Instruction Manual (Detailed)".
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The optional surge voltage suppression filter FR-ASF-H and FR-BMF-H can be used under V/F control and Advanced magnetic
flux vector control. The sine wave filter MT-BSL and MT-BSC can be used under V/F control. Do not use the filters under different
control methods.
(For details, refer to the Instruction Manual of the option.)
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Refer to the "FR-A800 Instruction Manual (Detailed)" to drive a 400 V class motor by an inverter.
500 m or less
300 m
300 m
300 m + 300 m = 600 m
