TECO-Westinghouse Motor MA7200, Инструкция по эксплуатации

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(C) GROUNDING
:
(1) Always use the ground terminal (E) with a ground resistance of less than 100
Ω
.
(2) Do not share the ground wire with other devices, such as welding machines or
power tools.
(3) Always use a ground wire that complies with the technical standards on electrical
equipment and minimize the length of ground wire.
(4) When using more than one inverter, be careful not to loop the ground wire, as
shown below.
(a) OK (b) OK (c) NO
Fig. 5. MA7200 ground winding
•
Determine the wire size for the main circuit so that the line voltage drop is within
2% of the rated voltage. (If there is the possibility of excessive voltage drop, use a
larger wire suitable to the required length)
•
Installing an AC reactor
If the inverter is connected to a large-capacity power source (600kVA or more),
install an optional AC reactor on the input side of the inverter. This also improves
the power factor on the power supply side.
•
If the cable between the inverter and the motor is long, the high-frequency
leakage current will increase, causing the inverter output current to increase as
well. This may affect peripheral devices. To prevent this, adjust the carrier
frequency, as shown below:
Cable length < 100ft. 100-165ft. 166-328ft.
>
329ft.
Carrier frequency
(Cn-34)
15kHz max
(Cn-34=6)
10kHz max
(Cn-34=4)
5kHz max
(Cn-34=2)
2.5kHz
(Cn-34=1)