motor rating

[admin]

we are having the centrifugal backward van blower. flow is 22000 nm3/hr. pr. 3300 mmWc. to run this blower what is the capacity motor required. as per supplier recomendation 315 KW with soft starter. but we started the blower frequently triping at 1700 rpm. speed not picking up with in 35 seconds. can you help me to short out the problem.

[admin]

Is the soft start control set to accelerate by current ot time limit?

[admin]

Sasikumar, why don't you fit an inverter?

 

The initial cost may be more but you will soon(?) pay that back as the problem that I see is purely start up requirement. Using an inverter you can

(1) set the start up to whatever time you need to.

(2) adjust the running speed to accurately give you required airflow (this can be by pressure or mass airflow monitoring, this in time will give you payback on your inverter costs through reduced power consumption.

(3) possibly over time find that you can fit a smaller motor (but that would be for another time)

 

Also there are/were grants towards these purchases, worth considering. Try ABB/Hitatchi/SEW/Seimens/Omron etc.

 

Hope this is of some help.

 

Kev

[erickench]

A motor has two overcurrent devices. An overload and a ground-fault short-circuit OCPD. What exactly is tripping? If it trips as soon as it starts then your ground-fault short-circuit is not set properly. Is it an AC motor?

[jones]

Sasikumar said:

we are having the centrifugal backward van blower. flow is 22000 nm3/hr. pr. 3300 mmWc. to run this blower what is the capacity motor required. as per supplier recomendation 315 KW with soft starter. but we started the blower frequently triping at 1700 rpm. speed not picking up with in 35 seconds. can you help me to short out the problem.

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please tell us what is starter u r using now ? is it a soft starrter , Star delta, soft starter or what ?

see there is a basic calculaiton for a fan speen motor find the power requirement and take the eqivalent size of appropriate motor.

Now starter plays a vital role , set the paramer as per the manufacutere requirement if it is not still in solutin , please tell us in detail ….of your problem..

[Author]

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