HV350 Mini Frequency Inverter User Manual
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It is forbidden to short circuit or ground the inverter output terminal, otherwise the internal
components of the inverter will be damaged.
Avoid short circuit the output cable and the inverter enclosure, otherwise there exists the danger of
electric shock.
It is forbidden to connect the output terminal of the inverter to the capacitor or LC/RC noise filter with
phase lead, otherwise, the internal components of the inverter may be damaged.
When contactor is installed between the inverter and the motor, it is forbidden to switch on/off the
contactor during the running of the inverter, otherwise, there will be large current flowing into the inverter,
triggering the inverter protection action.
Length of cable between the inverter and motor
If the cable between the inverter and the motor is too long, the higher harmonic leakage current of the
output end will cause adverse impact on the inverter and the peripheral devices. It is suggested that
when the motor cable is longer than 100m, output AC reactor be installed. Refer to the following table for
the carrier frequency setting.
Length of cable between the
inverter and motor
Less than 50m
Less than 100 m
More than 100m
Carrier frequency
Less than 15kHz
Less than 10kHz
Less than 5kHz
3.6.3 Grounding Wiring
The inverter will produce leakage current. The higher the carrier frequency is, the larger the leakage
current will be. The leakage current of the inverter system is more than 3.5mA, and the specific value of
the leakage current is determined by the use conditions. To ensure the safety, the inverter and the motor
must be grounded.
The grounding resistance shall be less than 10ohm. For the grounding wire diameter requirement,
refer to 3.3 lectotype of main circuit peripheral devices.
Do not share grounding wire with the welding machine and other power equipment.
In the applications with more than 2 inverters, keep the grounding wire from forming a loop.
Correct Wrong
Fig. 3−3 Grounding wiring
