J
I would like the description to provide me with the similarities or differences with the logic of the MarkI/II circuits.
for example, the MarkI/II valve test could be described as
1) the valve position sums the desired valve position with the actual to derive an error signal that is convert to a current for the servo valve.
2) the gain of the valve position is such that an approximately 5% error produces a 100% servo current.
3) to limit the opening rate of a valve, a ceiling limiter is applied to the current to limit the servo for a 10%/second opening rate.
4) to test the valve, the ceiling limit is reduced to a value that provides a servo current to close the valve at 10%/second
5) once the valve is closed, the opening limit is reestablish, and due to the large error between the pretest desired position and the now lower position, the servo current saturates at the 10%/sec rate, till the valve returns to pretest position and returns to servo control.
So with respect to the way MarkI/II did valve test, how does MarkV do it.
My experience is with MarkI/II, but I never even seen the LSTG digital controls. I need this information to help me understand a possible actuator problem a customer is experiencing. This was a retrofit so it is the same actuators I am familiar with.
Thanks and keep it simple since I have a problem understanding that digital stuff
for example, the MarkI/II valve test could be described as
1) the valve position sums the desired valve position with the actual to derive an error signal that is convert to a current for the servo valve.
2) the gain of the valve position is such that an approximately 5% error produces a 100% servo current.
3) to limit the opening rate of a valve, a ceiling limiter is applied to the current to limit the servo for a 10%/second opening rate.
4) to test the valve, the ceiling limit is reduced to a value that provides a servo current to close the valve at 10%/second
5) once the valve is closed, the opening limit is reestablish, and due to the large error between the pretest desired position and the now lower position, the servo current saturates at the 10%/sec rate, till the valve returns to pretest position and returns to servo control.
So with respect to the way MarkI/II did valve test, how does MarkV do it.
My experience is with MarkI/II, but I never even seen the LSTG digital controls. I need this information to help me understand a possible actuator problem a customer is experiencing. This was a retrofit so it is the same actuators I am familiar with.
Thanks and keep it simple since I have a problem understanding that digital stuff