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PCU12005 Datasheet(PDF) 70 Page - Red Lion Controls. Inc |
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PCU12005 Datasheet(HTML) 70 Page - Red Lion Controls. Inc |
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70 / 96 page  ON/OFF CONTROL The controller operates in the ON/OFF control mode by setting the proportional band = 0.0%. The ON/OFF control hysteresis band (CHYS) parameter eliminates output chatter around setpoint. The Secondary output can also be used in the ON/OFF control by setting the relative gain = 0.0 (GAN2). Additionally, the deadband parameter (db-2) determines the amount of operational deadband or overlap between the two outputs. The phase of the control action can be reversed by the output control action parameter. ON/OFF control is usually characterized by signal oscillations about the setpoint value. Large hysteresis values make the oscillations larger. ON/OFF control should only be used where the constant oscillations are acceptable. -62- Figure 33, OP1 On/Off Action Figure 34, OP2 On/Off Action |
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