EXAMPLE 4

ON TIME CALCULATIONS AND EFFECTS OF TUNING PARAMETERS

Asphalt Calibration Scale Weight Indicator

TM-5-3895-374-24-1 Paving Machine Bituminous Material: Crawler Mounted Diesel Engine Driven Manual
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TM 5-3895-374-24-1 GP470FA EXAMPLE 2: Same as example 1 except Proportional Band - 80% (0.80) DEV = 0.10" (same as example 1) 0.10 Output = 0.80 x 1.0 = 0.125 Displayed as OUT 62.5 (50 + 12.5) (output decreases due to Pb increase) On Time = : 5 x 0.125 : = 0.625 seconds (on time decreases) Relay 1 will be on for 0.625 seconds and off for 4.375 seconds. EXAMPLE 3: Same as example 1 except Cycle Time - 10 seconds. DEV = 0.10" (same as example 1) Output = 0.20 (same as example 1) On Time = : 10 x 0.20 : = 2.0 seconds (on time increases due to cycle time increase) Relay 1 will be on for 2 seconds and off for 8 seconds. EXAMPLE 4: Same as example 1 except Dryer Draft - -0.15" wc. Since the measured draft is now less than the setpoint the deviation is a negative value and the controller will energize Relay 2 in order to Open the exhaust damper. The on time of relay 2 is calculated as follows: DEV = (-0.20") - (-0.15") = -0.05" = -0.05" Output = 0.50 x 1.0 = -0.10 Displayed as OUT 40.0 (50 - 10) On Time = : 5 x -0.10 : = 0.5 seconds Relay 2 will be on for 0.5 seconds and off for 4.5 seconds. (page 3-50)

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