9
2.5 Matters needing attention for Wiring
○
1 When replacing the motor, you must cut off the input power of the inverter.
○
2 When the frequency inverter stops outputting, the motor can be switched or the power frequency can be switched.
○
3 In order to minimize the influence of electromagnetic interference, when the electromagnetic contactors and relays
used are close to the frequency inverter, the surge absorption device should be considered.
○
4 Do not connect the AC input power to the output terminals U, V and W of the frequency inverter.
○
5 The external control line of the frequency inverter needs to be isolated or shielded.
○
6 In addition to shielding, the input command signal connection should be routed separately, preferably away from the
main circuit connection.
○
7 When the carrier frequency is less than 4KHz, the maximum distance between the inverter and the motor should be
within 50 meters. When the carrier frequency is greater than 4KHz, this distance should be appropriately reduced.
This connection is best laid in a metal pipe.
○
8 When the inverter is equipped with peripheral equipment (filter, reactor, etc.), the insulation resistance to the ground
should be measured with a 1000 volt megohmmeter to ensure that it is not lower than 4 megohms.
○
9 Phase-in capacitors or resistance-capacitance absorption devices cannot be installed at the U, V and W output
terminals of the frequency inverter.
○
10 If the frequency inverter needs to be started frequently, dont turn off the power supply. You must use the GND/RUN
of the control terminal to start and stop, so as not to damage the rectifier bridge.
○
11 In order to prevent accidents, the grounding terminal G must be grounded reliably (the grounding impedance should
be below 100Ω), otherwise there will be leakage.
○
12 When wiring the main circuit, please choose the wire diameter specification according to the relevant provisions of
the national electrical regulations.
