Inverter Wiring 9
3 Inverter Wiring
3.1 Wiring precautions
(1) Make sure intermediate circuit breaker is connected between the
frequency inverter and power supply to avoid expanded accident when
the frequency inverter is faulty.
(2) In order to reduce electromagnetic interference, please connect surge
sorber on the coil of electromagnetic contactor, relay and etc. in the
surrounding circuit of the frequency inverter.
(3) Please use shielded wire of above 0.3mm² for the wiring of such analog
signals as frequency setting terminal AI and instrument loop (AO), etc.
The shielding layer shall be connected on the grounding terminal E of
the frequency inverter with wiring length less than 30m.
(4) The stranded wire or shielded wire of above 0.75mm² shall be selected
for the wiring of input and output loop (X1-X4) of relay; and the shielded
layer shall be connected to the common port CM of control terminals,
with wiring length less than 50 m.
(5) The control wire shall be separated from the power line of major loop;
it shall be at a distance of above 10cm for parallel wiring and vertical
for cross wiring.
(6) The connecting wire between the inverter and the motor shall be less than
30m; and when it is longer than 30m, the carrier frequency of the inverter
shall be appropriately reduced.
(7) All leading wires shall be fully fastened with terminals to ensure good contact.
(8) The pressurization of all the leading wires shall be in compliance with
the voltage class of the frequency inverter.
Absorption capacitor or other RC absorbers shall not be installed
at U, V and W output end of the frequency inverter, as shown in
figure 3-1.
E550 Series Universal Low-Power Inverter
