21
•
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.
Allowed Carrier Frequency <15 kHz <5 kHz <2.5 kHz
To Next Page
Loading...
Need help?
General
