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E6581381
E-27
5
[Using a VF motor (motor for use with inverter)]
■ Setting of electronic thermal protection characteristics selection QNO
Setting value Overload protection Overload stall
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×
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{ : valid, × : invalid
VF motors (motors designed for use with inverters) can be used in frequency ranges lower than those
for standard motors, but their cooling efficiency decreases at frequencies below 6Hz.
■ Setting of motor electronic thermal protection level 1VJT (Same as H)
If the capacity of the motor is smaller than the capacity of the inverter, or the rated current of the motor
is smaller than the rated current of the inverter, adjust the electronic thermal protection level 1 VJT so
that it fits the motor's rated current.
* If the indications are in percentages (%), then 100% equals the inverter's rated output current (A).
VJT
×1.0
Output frequency (Hz)
Output current reduction factor [%]
/
[A]
0
Setting the motor overload starting level
6Hz
VJT
×0.6
2) Motor 150%-overload time limit H
Parameter H is used to set the time elapsed before the motor trips under a load of 150% (overload trip
QN) within a range of 10 to 2400 seconds.
3) Inverter over load characteristics
Set to protect the inverter unit. Cannot be changed or turned off by parameter setting.
To prevent the inverter overload trip function (QN) from being activated too easily, lower the stall
prevention level (H) or increase the acceleration time (CEE) or deceleration time (FGE).