SolarHydraulicControl (FB)

FUNCTION_BLOCK SolarHydraulicControl EXTENDS AbbLConC3

Function block is to manage two pistons as actuator device.

Hydraulic system to move the tracker

Hydraulic system is based in the action of two hydraulic pistons (Piston A and Piston B) that are controlled by four solenoid valves. Each hydraulic piston has two solenoid valves to control its movement. These solenoid valves are two position valves.

• A1: Backward piston A (piston A reduces its length).

• A2: Forward piston A (piston A increases its length).

• B1: Backward piston B (piston B reduces its length).

• B2: Forward piston B (piston B increases its length).

Note

For more detailed explanation of the Hydraulic control with example and different types, refer to Automation Builder help of Solar Library.

InOut:

Scope	Name	Type	Initial	Comment	Inherited from
Input	Enable	BOOL	FALSE	A rising edge (Enable = TRUE) starts the operation, the output Busy goes to TRUE. All other inputs are read and considered continuously. Execution will continue forever until a falling edge (Enable = FALSE) aborts the operation. During Aborting the Busy is still TRUE. Afterward all outputs are reset.	AbbLConC3
Output	Busy	BOOL	FALSE	Operation is running (while output Error is FALSE)	AbbLConC3
	Error	BOOL	FALSE	Operation is stopped with error (while output Busy is FALSE). This output is TRUE for at least one cycle or until Enable is set to FALSE. The output ErrorID gives more details about the error.	AbbLConC3
Input	StartHydSys	BOOL	FALSE	2: Starts SolarHydraulicControl block.
	Direction	BOOL	FALSE	3: Indicates the direction movement of Solar Tracker. TRUE:= Forward, FALSE:= Backward
	PosAct	REAL	0	4: Actual position value of solar tracker
	PosMin	REAL	-30	5: Lower limit of the movement range.
	PosMax	REAL	180	6: Upper limit of the movement range.
	SingularPointA	REAL	30	7: Indicates a position of the Solar Tracker (angular position). In that position, the mechanical structure of Solar Tracker shows a singular point concerning to piston A. In that situation, piston A does not generate any torque value. This value is given by tracker manufacturer. Format: Degrees
	SingularPointB	REAL	130	7: Indicates a position of the Solar Tracker (angular position). In that position, the mechanical structure of Solar Tracker shows a singular point concerning to piston B. In that situation, piston B does not generate any torque value. This value is given by tracker manufacturer. Format: Degrees
	Hys	REAL	0.01	9: Hysteresis value to avoid unnecessary piston movement. This value is obtained by testing the behavior of the Solar Tracker. Format: Degrees
	FreeWin	REAL	0	10: Value of semi angle in which hydraulic piston does not generate any torque value. Movement of hydraulic piston is free when is placed inside this window. This value is obtained by testing the behavior of the Solar Tracker. Format: Degrees
	PressureBuildUpTime	UINT	500	11: Time in ms to reach the correct hydraulic pressure
Output	ErrorID	ERROR_ID	NO_ERROR	3: Error number
	PumpRunning	BOOL	FALSE	4: TRUE indicates that pump is running
	FwdA	BOOL	FALSE	5: Piston A is running forward
	FwdB	BOOL	FALSE	6: Piston B is running forward
	BwdA	BOOL	FALSE	7: Piston A is running backward
	BwdB	BOOL	FALSE	8: Piston B is running backward

Methods:

A_StartAction

B_CyclicAction

C_CleaningAction

D_AbortAction

E_ResetAction

Structure:

• SolarHydraulicControl.A_StartAction (METH)
  • STARTACTION
  • Called: In the first invocation
• SolarHydraulicControl.B_CyclicAction (METH)
  • CYCLICACTION
• SolarHydraulicControl.C_CleaningAction (METH)
  • CLEANINGACTION
  • Return: —
• SolarHydraulicControl.D_AbortAction (METH)
  • ABORTACTION
  • Called: When in ExecutingState Enable will get FALSE
• SolarHydraulicControl.E_ResetAction (METH)
  • RESETACTION
  • Called: After DONE, ERROR and ABORT state