E6581090
Output current reduction factor [%]
VJT×1.0 |
VJT×0.55 |
0 |
30Hz Output frequency (Hz) Note: The motor overload protection start level is fixed at 30Hz.
[Using a VF motor (motor for use with inverter)]
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| ■Setting selection QNO of electronic thermal protection characteristics | |||
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| Setting | Overload | Overload stall |
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5 |
| value | protection |
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| ○ | × |
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| ○ | ○ |
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| × | × |
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| × | ○ |
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○: valid, × : invalid
A VF motor (motor for use with an inverter) can be used in lower frequency ranges than the general- purpose motor, but if that frequency is extremely low, the effects of cooling on the motor will deteriorate.
■Setting the motor electronic thermal protection level 1 VJT
If the capacity of the motor being used 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).
Output current reduction factor [%]/[A]
VJT×1.0 |
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VJT×0.6 |
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0 | 6Hz |
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| Output frequency (Hz) | ||
Setting of motor overload | |||
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protection start level |
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2) Inverter over load characteristics
Set to protect the inverter unit. Cannot be changed or turned off by parameter setting.
If the inverter overload trip function (QN) is activated frequently, this can be improved by adjusting the stall operation level H downward or increasing the acceleration time CEE or deceleration time FGE.
Inverter overload
Time [s] |
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| 100%: inverter rated output current |
60 |
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0 | Output current [%] |
110% | 150% |
*To protect the inverter, overload trip may activate in a short period of time when output current reaches 150% or higher.
Inverter overload protection characteristics
