Specifications

 Chapter2SpecificationsandSelectionVFD‐G7SeriesFrequencyInverterOperationManual
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③Damagesincurredtotheinverterduetotheimproperuseofinverterfunctions;
4. Related service fee will be calculated according to the unified standards of the
manufacturer.Ifthereareanymaintenancecontracts,thecontractprevail.
2.9 Selection Guide
Whenselecting the frequency inverter, firstly,you must not only be clearon the technical
requirements the system to the frequency inverter, the using situations, the specific load
characteristics,butalsotakeotherfactorssuchasadaptermotor,outputvoltageandrated
output current into consideration, then you can select the
 models which meet your
requirementsandmakesurethemodeofoperation.
Basic principles: the motor rated load current must not exceed the rated current of the
frequency inverter. Generally, choose according to the matched motor capacity stipulated
bytheinstructions,pleasepayattentiontocomparetheratedcurrentof
themotorandthe
frequencyinverter.Theoverloadcapacityoftheinverterisdesignedaimedattheshorttime
overload in the process of starting and braking process. For constant torque load or the
applicationswheretheloadisalittleheavies,ifthereisoverloadsituationintheprocessof

running, it will exceed the output ability of the frequency inverter, so please consider to
amplifyagrade.
Fanandwaterpump:Fanandwaterpumptypeshavelowerrequirementsintheoverload
ability. The load torque is proportional to the square of the speed, so the inverter which
running at the low speed has a light load (except for the Roots blower), and because this
kind of load has no special requirements on the rotate speed accuracy, the P‐type can be
choosed.