PSTC - Linear Actuator Drive - General Manual Rev 2.pdf

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Appendix C: screwJACK\\\\\\\\\\\\Parameter Computation Array Angle S = 0° R1 R2 L1 Western Mount Position – View Facing South Level, Face-up Position East Array Angle S = +45° Tracking Axis Pivot Linear Actuator Extension Length Flange Face Offset Torque Arm Drive Pivot Flange L2 Pylon Base Pivot Unit Retracted to Soft Limit, S = 45° © 2003 Enhancement Electronics, Inc. 40
Array Angle S = -45° West L3 Linear Actuator at Full Extension to Soft Limit, S =-45° There are three screwjack parameters stored in the SolarTrak® in the ‘Drive Parameters’ screen, SJP #1-3, computed from the quantities R1, R2, L1-3 defined above. Lengths are in inches. The Law of Cosines is applied to convert the requested angular position to a specific actuator extension. The fundamental equation relating the actuator length and array angle is: (1) L = √ R1^2 + R2^2– 2 * R1 * R2 * COS(S + β) Where L is the length of the actuator, S is the requested array angle and β is an angular offset based on the relative positions of R1 and R2 when the array is facing straight up (S = 0). Since some of the computations for these terms need only be performed once, the parameters are stored as pre-combined coefficients producing the equivalent equation (2). SJP #2 = (+/-) 2 * R1 * R2 SJP #3 = R1^2 + R2^2 (+West Mount, -East) (2) L = √ SJP#3 + SJP#2 * COS(S + β) (3) β = ACOS {(L^2– SJP#3)/ SJP#2} – S SJP #1 = β Equation (1) above is used for converting a specific Sun angle to a specific screwjack extension point. Equation 3 should be used to determine β for L equals each of the measurable quantities L1 (S = 0), L2 (S = 45, in radians) and L3 (S = -45). The result found for β should be the same in each case. © 2003 Enhancement Electronics, Inc. 41
Page 1 and 2: Owner’s Manual For The SolarTrak
Page 3 and 4: The Powertracker Drive Unit Standar
Page 5 and 6: Determining the Current Operational
Page 7 and 8: Installation and Check-out Instruct
Page 9 and 10: 4. Dual 208 VAC Power Source w/Grou
Page 11 and 12: 4. 208 VAC Power Source w/Ground --
Page 13 and 14: Uncrating and Installation: Each sh
Page 15 and 16: Power Connection and Startup Sequen
Page 17 and 18: Display/Edit Parameters on SolarTra
Page 19 and 20: Section 5. Calibration to Onsite As
Page 21 and 22: 3. Press Enter/Select again. The di
Page 23 and 24: User Interface Module Section 1. Me
Page 25 and 26: pressing the A or B button moves th
Page 27 and 28: DOS Command Line Option Switches St
Page 29 and 30: E: Setting up Batch File Execution
Page 31 and 32: INITIAL STARTUP: “Main Control Pa
Page 33 and 34: The Configure (CFG) Command: The CF
Page 35 and 36: Parameter Tables: Once in either th
Page 37 and 38: . Ax1 Gear Ratio : 3.7800 Timed Mot
Page 39: Moving Parameters between SolarTrak

PSTC - Linear Actuator Drive - General Manual Rev 2.pdf

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