Dear all,
I need some guidance when coming to define the Siemens hardware architecture of a three stage lift automation solution.
I have only theoretical knowledge on PLC from my previous education , I never worked with S7 plc nor inverters.
Main requirements:
Inverter rated power 15 Kw.
From my research on the net i chose the following :
Config 1:
The motor is a 4 pole asynchronous to be controlled as 400 V delta with 87 Hz characteristics.
The inverter is a Siemens G120 with CU 250 S controller.
This architecture relies heavily on field bus (PN or DP), and expensive technology modules and encoders.
Questions:
1.Do i need to use encoders to achieve my requirements, speed control, positioning control?
2.Is a speed encoder on motor shaft enough?
3.What is the typical control method for my application.(V/F, vector with encoder, sensorless...) i am really lost with all these possibilities.
I have been asked to submit two solutions for pricing and i would appreciate any guidance and help on any equivalent hardwired solution that meets the requirements !!!
Config 2 :
4.Is there any equivalent solution without using encoders and field buses?
I am thinking about hardwired control from PLC to inverter,
Limit and proximity switches inside the lift to achieve slow down and stopping functions.
5.Does a hard wired solution do the job?
Thanks,
I need some guidance when coming to define the Siemens hardware architecture of a three stage lift automation solution.
I have only theoretical knowledge on PLC from my previous education , I never worked with S7 plc nor inverters.
Main requirements:
- Achieve +- 5 mm positioning precision when stopping the lift. load 1200 Kg.
- Achieve the desired traveling speed of 0.8 m/s with 0.5m/s2 acceleration
- Of course the last one, lowest hardware cost possible.
Inverter rated power 15 Kw.
From my research on the net i chose the following :
Config 1:
The motor is a 4 pole asynchronous to be controlled as 400 V delta with 87 Hz characteristics.
The inverter is a Siemens G120 with CU 250 S controller.
This architecture relies heavily on field bus (PN or DP), and expensive technology modules and encoders.
Questions:
1.Do i need to use encoders to achieve my requirements, speed control, positioning control?
2.Is a speed encoder on motor shaft enough?
3.What is the typical control method for my application.(V/F, vector with encoder, sensorless...) i am really lost with all these possibilities.
I have been asked to submit two solutions for pricing and i would appreciate any guidance and help on any equivalent hardwired solution that meets the requirements !!!
Config 2 :
4.Is there any equivalent solution without using encoders and field buses?
I am thinking about hardwired control from PLC to inverter,
Limit and proximity switches inside the lift to achieve slow down and stopping functions.
5.Does a hard wired solution do the job?
Thanks,
Last edited: