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PXU41A50 Datasheet(PDF) 10 Page - Red Lion Controls. Inc |
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PXU41A50 Datasheet(HTML) 10 Page - Red Lion Controls. Inc |
10 / 32 page 10 SETPOINT RAMP RATE to display units/minute * By ramping the setpoint at a controlled rate, the setpoint ramp rate can reduce sudden shock to the process and reduce overshoot on startup or after setpoint changes. When viewing setpoint value, and the setpoint is ramping, the setpoint will alternate between rSPx and the target setpoint value. The ramp rate is in least- significant (display units) digits per minute. A value of 0 disables setpoint ramping. Once the ramping setpoint reaches the target setpoint, the setpoint ramp rate disengages until the setpoint is changed again. If the ramp value is changed during ramping, the new ramp rate takes effect. If the setpoint is ramping prior to starting Auto-Tune, the ramping will terminate when Auto-Tune starts. Deviation and band alarms are relative to the target setpoint, not the ramping setpoint. A slow process may not track the programmed setpoint rate. At power up, the ramping setpoint is initialized to the current temperature/process value. ACTIVE SETPOINT VALUE to display units * CONTROL OUTPUT 1 or 2 % OUTPUT POWER . to . The parameter name indicates the active setpoint. The Setpoint value can be changed by pressing the arrow keys. This parameter can be configured as read only in the Display Loop, but read/write in the Hidden Loop (dSPr). Select the second Setpoint value by using the 1 or 2 key, user input, or the SPSL parameter. Both Setpoint values are limited by the Setpoint Low and High Limits in Input Module 1-IN. While the controller is in Automatic Mode, this value is read only. When the controller is placed in Manual Mode, the value can be changed by pressing the arrow keys. For more details on % Output Power, see Control Mode Explanations. CONTROLLER STATUS When in rUN mode, the control output(s) respond based on their corresponding % output value. When in StOP mode, the control output(s) are disabled. Integral wind-up can be reset by entering StOP and then going back to rUN mode. I PID GROUP or Select different PID parameters by choosing one of two different PID groups. The following parameters may be locked from display or made available in either the main Display Loop, the Parameter Loop or the Hidden Loop as configured in programming module 3-LC. Values configured for dSPr are read only when in the main display loop, but are writable when in the Hidden Loop. The value mnemonics are shown for each parameter, as well as the factory setting for each of the values. . OUTPUT POWER OFFSET When the Integral Time is set to zero, the power offset is used to shift the proportional band to compensate for errors in the steady state. If Integral Action is later invoked, the controller will re-calculate the internal integral value to provide “bumpless” transfer and Output Power Offset will not be necessary. . to . % power x . . 7 PROPORTIONAL BAND to display units * The proportional band should be set to obtain the best response to a process disturbance while minimizing overshoot. For more information, see Control Mode and PID Tuning Explanations. I INTEGRAL TIME to seconds Integral action shifts the center point position of the proportional band to eliminate error in the steady state. The higher the integral time, the slower the response. The optimal integral time is best determined during PID Tuning. 3 DERIVATIVE TIME to seconds Derivative time helps to stabilize the response, but too high of a derivative time, coupled with noisy signal processes, may cause the output to fluctuate too greatly, yielding poor control. Setting the time to zero disables derivative action. . I INTEGRATION DEFAULT . to . % output power The Integration Default is the default integration value of integral control. When the process value enters the proportional band, the PXU will take the Integration Default as the default control output of integral control. The value is determined at Auto-Tune. display/parameTer/hidden lOOp parameTer desCripTiOns * Range/Decimal position is Programming dependent. |
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