Main circuit terminals
39
2
Total wiring length
Connect one or more general-purpose motors within the total wiring length 500 m. (The wiring length should be 100 m or
less under vector control.)
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
Pr.72 PWM frequency selection
according to
the wiring length.
• If the motor capacity is 280 kW or lower, connect the sine wave filter (MT-BSL/BSC) to the output side.
NOTE
• 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 or fast response current limit function or 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 the details of
Pr.156 Stall prevention operation selection
, refer to the FR-A800 Instruction Manual
(Detailed))
• A sine wave filter (MT-BSL/BSC) can be used under V/F control. Do not use the filters under different control methods.
• For the details of
Pr.72 PWM frequency selection
, refer to the FR-A800 Instruction Manual (Detailed).
• Refer to
to drive a 400 V class motor by an inverter.
Total wiring length
Wiring length 100 m or shorter
Wiring length longer than 100 m
6 (6 kHz) or lower
4 (4 kHz) or lower
500 m or less
300 m
300 m
300 m + 300 m = 600 m
Summary of Contents for FR-A842-07700
Page 71: ...MEMO 70 ...
Page 91: ...MEMO 90 ...
