LSIS 6731001500, User Manual

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35
Installing
the Inverter
Note
•
Apply a DC input to the P2 (+) and N (-) terminals to operate the inverter on DC current input.
•
Use STP (Shielded Twisted Pair) cables to connect a remotely located motor with the inverter. Do
not use 3 core cables.
•
Make sure that the total cable length does not exceed 492 ft (150 m). For inverters < = 3.7 kW
capacity, ensure that the total cable length does not exceed 165 ft (50 m).
•
Long cable runs can cause reduced motor torque in low frequency applications due to voltage
drop. Long cable runs also increase a circuit’s susceptibility to stray capacitance and may trigger
over-current protection devices or result in malfunction of equipment connected to the inverter.
•
Voltage drop is calculated by using the following formula:
•
Voltage Drop (V) = [√3 X cable resistance (mΩ/m) X cable length (m) X current (A)] / 1000
•
Use cables with the largest possible cross-sectional area to ensure that voltage drop is minimized
over long cable runs. Lowering the carrier frequency and installing a micro surge filter may also
help to reduce voltage drop.
Distance < 165 ft (50 m) < 330 ft (100 m) > 330 ft (100 m)
Allowed Carrier Frequency <15 kHz <5 kHz <2.5 kHz
Do not connect power to the inverter until installation has been fully completed and the inverter is
ready to be operated. Doing so may result in electric shock.
•
Power supply cables must be connected to the R, S, and T terminals. Connecting power cables to
other terminals will damage the inverter.
•
Use insulated ring lugs when connecting cables to R/S/T and U/V/W terminals.
•
The inverter’s power terminal connections can cause harmonics that may interfere with other
communication devices located near to the inverter. To reduce interference the installation of
noise filters or line filters may be required.
•
To avoid circuit interruption or damaging connected equipment, do not install phase-advanced
condensers, surge protection, or electronic noise filters on the output side of the inverter.
•
To avoid circuit interruption or damaging connected equipment, do not install magnetic
contactors on the output side of the inverter.