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Vfd For Blower Application


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#1 Ramasubramanian

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Posted 11 January 2008 - 05:16 AM

In the process of battery manufacturing, We are Curing & Drying Ovens. The purpose of this oven is to cure the battery plates at 100% RH and dry the plates at 50 to 100 C with different cycle times. Our company has designed these ovens indigenously and the entire oven is made in house.



The temperature and humidity and the speed of the blower is controlled through circular chart recorder. With different event timings programmed manually. Each event is set with temperature and humidity according to the requirement. The blower connected to the oven to circulate the temperature and humidity throughout the oven uniformly. According to the event timings the blower will run at different frequencies.



The blower motor is connected to a VFD which is controlled through Circular chart recorder which is having six relay outputs. Each relay output in the recorder is programmed manually, according to the event timing given in the recorder the relay will operate to change the frequency of the motor. Here the blower will run with four different frequencies with four event timings.

The blower motor is 30 HP.

Suggest a suitable category of VFD






#2 marke

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Posted 11 January 2008 - 08:21 PM

Hello Ramasubramanian

Almost all digital VFDs have preset speeds on them, so provided that the VFD is well supported locally and it has sufficient preset speeds, it should work.
There is nothing special about the application based on your description.

You could gain better control by using a closed loop system whereby you use a sensor such as a temperature sensor, or a humidity sensor (or both) and instead of setting the VFD speed, you set the target condition and let the VFD operate at the speed to keep this constant. Most VFDs can do this also.

Best regards,

#3 chaterpilar

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Posted 14 January 2008 - 01:47 PM

QUOTE (Ramasubramanian @ Jan 11 2008, 08:16 AM) <{POST_SNAPBACK}>
In the process of battery manufacturing, We are Curing & Drying Ovens. The purpose of this oven is to cure the battery plates at 100% RH and dry the plates at 50 to 100 C with different cycle times. Our company has designed these ovens indigenously and the entire oven is made in house.



The temperature and humidity and the speed of the blower is controlled through circular chart recorder. With different event timings programmed manually. Each event is set with temperature and humidity according to the requirement. The blower connected to the oven to circulate the temperature and humidity throughout the oven uniformly. According to the event timings the blower will run at different frequencies.



The blower motor is connected to a VFD which is controlled through Circular chart recorder which is having six relay outputs. Each relay output in the recorder is programmed manually, according to the event timing given in the recorder the relay will operate to change the frequency of the motor. Here the blower will run with four different frequencies with four event timings.

The blower motor is 30 HP.

Suggest a suitable category of VFD


There are many in the market but most suitable one will be the one who does not just sell the VSd to you, but takes care of it ( good aftersales service).

Well if you have Schneider Electric dealer go for ALtivar VSD part no ATV61HD30N4.

Please ensure the room in which it is installed is fumes free and panel is well ventilated.

it can cater to all your preset speeds.

Good luck




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