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Hello AUTOMATION, We want to tend for a project to upgrade the control system of a crane, we have some technical problems about inverter. Here are the questions: 1. There is 1 motor for lift, and the parameters are: Rate lift force: 2X250 KN Brake moment: 500 N.M Motor type: YZ200L-8 (Made in China) Motor rate power: 18.5 kW Motor rate rev: 697 rmp This motor is squirrel-cage motor. There are 4 motors for crane move on the railway, and the parameters are: Moving load: 14600 N Brake moment: 15 N.M Motor type: YPE-4-750Si (Made in China) Motor rate power: 0.75 kW Motor rate rev: 1380 rpm These 4 motors are wound motor. The power source is AC. 380 V, 50 Hz. We want use inverter for control of these 5 motors, how can I select the inverter for them? 2. For the economy reason, if I can use 1 inverter for the 4 moving motors? and how can I select the inverter? Or for the more economy way, if I can use only 1 inverter for these 5 motors? (Because there are some interlock between the lift and move, these 2 operate state can't work at the same time) And how can I select? 3. Are there any different of using inverter for wound motor and squirrel-cage motor? This project is an urgency, and it is holiday in China, so I ask you these question directly. It will be very helpful to answer me as soon as possible, thank you very much. -- Best regards, ZH mailto:[email protected]