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contactor can be installed on the input side to control the on-off of main circuit power supply, so as to
ensure safety.
Rated current of
contactor (A)
Note: the parameters of the options in the table are ideal values, which can be adjusted according to the actual
situation, but try not to be lower than the parameters in the table.
6-3-4. Reactor selection guide
ď‚· In order to prevent the instantaneous large current from flowing into the input power circuit and damaging
the rectifier components when the power grid is under high voltage input, AC reactor should be connected
to the input side, which can also improve the power factor of the input side.
ď‚· When the distance between the inverter and the motor is more than 50 meters, the leakage current is large
due to the parasitic capacitance effect of the long cable to the ground, and the inverter is prone to
over-current protection. At the same time, in order to avoid the insulation damage of the motor, the output
reactor must be added for compensation. When a frequency converter is equipped with multiple motors,
the sum of the cable length of each motor is considered as the total length of the motor cable. When the
total length is greater than 50m, the output reactor must be added at the output side of the frequency
converter.
ď‚· VH6 series frequency converters with power of 18.5kw and above have built-in DC reactors. DC reactor
can improve the power factor, avoid the damage of rectifier bridge caused by excessive input current of
frequency converter due to large capacity transformer, and avoid the damage of rectifier circuit caused by
grid voltage mutation or harmonic caused by phase controlled load.
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