发表于:2005-04-27 11:43:00
5楼
For the big power motor start/stop comtrol panel ,it need your following condition :
1.Transformer capacity ,if the capacity is small ,you have to choose the voltaage-descrease start .if sufficient you can choose direct on line.
2.For the torquer requirment.if the equipment need the big torqure ,when it start ,you have to choose direct n line ,else you can choose the d-y start or self voltage descrease start.
3.The cost for the start/stop panel .if you want to minimum your cost ,direct on line .you can choose the frequence if yu have sufficient money ,200KW frequence is about 200000 RMB .
You can choose it as your condition