rak_plc
Member
Hi All,
I could do with some advice on a hydraulic control system. It is necessary for me to accurately position a vertical hydraulic ram with an upper tool part. This will be subjected to an upwards force from below due to an hydroforming process. I've not been involved in the specification of the hydraulics but I have the following equipment to control:
String pot for the ram position
Pressure transducer for ram
Analogue valve for ram pressure
Analogue valve for ram flow
5cc digital valve back to tank
So the process will be - move the ram to a position - this is OK and I can stop to 1/10mm (very low speeds). Then during hydroforming there will be a gradual upwards force reaching the order of 55-100 tonnes which I need to then hold the ram in position by increasing the downwards force.
The only way I can think of tackling this is using a PID instruction in the Siemens S7 1500 plc which is what I will be attempting.
As soon as I saw it though I thought this is an hydraulic servo application - but I don't have the knowledge to offer an alternative to what they have got.
Any suggestions would be much appreciated.
I could do with some advice on a hydraulic control system. It is necessary for me to accurately position a vertical hydraulic ram with an upper tool part. This will be subjected to an upwards force from below due to an hydroforming process. I've not been involved in the specification of the hydraulics but I have the following equipment to control:
String pot for the ram position
Pressure transducer for ram
Analogue valve for ram pressure
Analogue valve for ram flow
5cc digital valve back to tank
So the process will be - move the ram to a position - this is OK and I can stop to 1/10mm (very low speeds). Then during hydroforming there will be a gradual upwards force reaching the order of 55-100 tonnes which I need to then hold the ram in position by increasing the downwards force.
The only way I can think of tackling this is using a PID instruction in the Siemens S7 1500 plc which is what I will be attempting.
As soon as I saw it though I thought this is an hydraulic servo application - but I don't have the knowledge to offer an alternative to what they have got.
Any suggestions would be much appreciated.