Bijoyq8
Electrical
- Feb 17, 2020
- 7
Dear Friends,
I have a situation which is similar to the thread 237-443212.Unfortunately the thread is closed.So I am starting a new thread.The motor current 450 KW centrifugal pump ( Cooling tower pump)driven by Soft starter.It takes high current during stopping.The stop (coasting ) mode selected is "PUMP STOP" and the coast down time to 0 secs !!.
The stopping torque is 20 % and stopping voltage is 0%.
The other settings are
a.Starting voltage 40%
b.Starting torque 10%
c.Limiting torque 150%
d.Current limiting value 400%
I have raised my objection on the 0.0 secs setting of "coast down time" .But the drive specialist says the time setting ( non zero value) is causing the high current drawn to be sensed by the 11KV breaker at 11/415 volt trafo ( incoming breaker),The pump is at basement and there is around 1.5 meter pipe length till the NRV.
Kindly provide your valuable inputs
I have a situation which is similar to the thread 237-443212.Unfortunately the thread is closed.So I am starting a new thread.The motor current 450 KW centrifugal pump ( Cooling tower pump)driven by Soft starter.It takes high current during stopping.The stop (coasting ) mode selected is "PUMP STOP" and the coast down time to 0 secs !!.
The stopping torque is 20 % and stopping voltage is 0%.
The other settings are
a.Starting voltage 40%
b.Starting torque 10%
c.Limiting torque 150%
d.Current limiting value 400%
I have raised my objection on the 0.0 secs setting of "coast down time" .But the drive specialist says the time setting ( non zero value) is causing the high current drawn to be sensed by the 11KV breaker at 11/415 volt trafo ( incoming breaker),The pump is at basement and there is around 1.5 meter pipe length till the NRV.
Kindly provide your valuable inputs