Inline duct fans ［Fans, Pumps, Compressors］ |
 Notices regarding the use of inverter drives
- Motor rating
The capacity range of the "Inline duct fan" is small.
Sometimes, there is a 100V motor rating.
In this case, please change the motor from 100V rating to 3 phase 200V rating.
(The inverter is designed for 3 phase 200V or 400V motor.)
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If you have only a single phase 100V power supply,
please select the VF-nC3 series that has a line-up for single phase 100V input / 3 phase 200V output.
VFNC3S-1001P (0.1kW)
VFNC3S-1002P (0.2kW)
VFNC3S-1004P (0.4kW)
VFNC3S-1007P (0.75kW)
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- Acceleration and deceleration time
"Inline duct fans" have variable torque characteristics, and some of them have a large load inertia.
When you set a short acceleration/deceleration time. you sometimes have the following problems:
While accelerating: Trip caused by overcurrent
While decelerating: Trip caused by overvoltage
If you have a fixed acceleration/deceleration time. please be careful with the inverter capacity selection.
- Motor capacity at high speed
Usually, you can't increase motor speed beyond its rated speed.
Ex. Change of speed to 110% will result in a load torque 110% x 110% = 121%.
This load torque will overload the motor or inverter.
In this case, you have to increase the motor and inverter capacity.
- Electromagnetic noise
The inverter is generating "electromagnetic noise".
If there are some high accuracy sensors or other sensitive equipment near the inverter drive,
the inverter's noise may cause some trouble or a malfunction.
Electromagnetic noise can be avoided by installing an external noise filter or
using a different wiring method.
- Harmonics
The inverter is generating "harmonics".
These harmonics sometimes cause a malfunction in other control equipment
that is connected to the same power source.
Harmonics can be avoided by installing an external "reactor".
To decrease "harmonics", we recommend to install DC reactors in all our inverter models.
(NOTE: 100V input models require AC reactors.)
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