5-7
5-3 Operation in V/f Control
This mode, which is used by conventional general-purpose inverters, is
convenientwhenreplacingaconventional model with the 3G3MVInverter
becausetheInverterinthis mode canbeoperatedwithout consideringthe
constants of the motor. Furthermore, set the Inverter to this mode if the
Inverterisconnectedtothantwoormoremotorsorspecialmotors,suchas
high-speed motors.
TooperatetheInverterinV/fcontrolmode,besuretosetn036fortherated
motor current and n011 through n017 for the V/f pattern.
5-3-1 Setting the Rated Motor Current (n036)
·Check the motor nameplate and set this parameter to the rated current.
·This set value is used for determining the electronic thermal characteristics to protect
themotorfromoverheating.Thecorrectsetvalueprotectsthe motorfromburningthat
may result from overloading.
n036 Rated Motor Current Register 0124
Hex
Changes during
operation
No
Setting
range
0.0% to 150% (A) of rated
output current of the Inverter
Unit of
setting
0.1 A Default setting See
note 1
Note 1. The default setting for thisparameter is the standard ratedcurrent of themaxi-
mum applicable motor.
Note 2. Motor overload detection (OL1) is disabled by setting the parameter to 0.0.
5-3-2 Setting the V/f Patterns (n011 to n017)
·Set the V/f pattern so that the motor output torque is adjusted to the required load
torque.
·The 3G3MV incorporates an automatic torque boost function. Therefore, a maximum
of150%torquecanbe output at 3 Hzwithoutchangingthedefaultsettings. Checkthe
system in trial operation andleavethedefault settings as they are if no torque charac-
teristic changes are required.
n011 Maximum Frequency (FMAX) Register 010B
Hex
Changes during
operation
No
Setting
range
50.0 to 400.0 (Hz) Unit of
setting
0.1
Hz
Default setting 60.0
Basic Operation Chapter 5
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