Hi,

We are designing a Fresh Water SCADA System and need some information about the hydraulic pump control process.

For an `emergency stop case` for three pumps in a pump station, I heard that we should not stop the pumps immediately but one by one in ten seconds time interval between each stop. And this is for hydraulic protection. Is it true? Is there any scientific explanation of the case?

If you can help us we will be very happy.

Best regards,

what is the application, and what are the 'estop' criteria?

In my world, in situations that endanger human life, the estop must stop motions as fast as possible, and either sacrfice machinery or provide some sort of pressure protection to protect it.

if the estop is not saftey critical, maybe the pump shutdown is to prevent water hammer effects?

kcj