Why can't I access programming on my Red Lion Controller?
If you cannot access programming on your Red Lion Controller, it could be because an active User Input is programmed for PLOC; deactivate the User Input. Alternatively, you may have entered an incorrect access code. Enter the proper access code at the CodE 0 prompt (111 or -111 is the universal access code).
Why is there no display on my red lion PXU20020?
If there is no display on your Red Lion Controller, it could be due to several reasons. First, check if the power is off. Second, a brown-out condition might be present, so verify the power reading. Third, there might be a loose connection or improper wiring, so check all connections. Lastly, ensure the controller is fully seated into the case by checking the installation.
What to do if red lion PXU20020 Controller shows '????' in the top display?
If your Red Lion Controller displays '????' in the top display, it could be due to several reasons. It may be that the input exceeds the range of the controller, so check the input parameters. Alternatively, the temperature might exceed the range of the input probe, so change to an input sensor with a higher temperature range. Also, the transmitter or probe could be defective or incorrect, so replace them. Finally, the temperature may be too high for the probe, so reduce the temperature.
What to do if red lion PXU20020 shows ' . . . ?. . .' or 'IN' in display?
If your Red Lion Controller displays ' . . . ?. . .' or 'IN', it might be because the display value exceeds the 4-digit display range, so check the input parameters. Another reason could be a defective or miscalibrated cold junction circuit, so change the display resolution or scaling.
Why is my red lion PXU20020 sluggish or not stable?
If your Red Lion Controller is sluggish or not stable, it could be due to incorrect PID values. Also, the probe location could be incorrect; evaluate its placement.
What to do if red lion PXU20020 shows '????' in display?
If your Red Lion Controller displays '????' in the display, it could be due to a disconnected probe, so check the probe wire or change the probe. Another reason might be a broken or burned-out probe, so check the sensor input type selection.
What to do if Red Lion Controller shows '????' in top display?
If your Red Lion Controller displays '????' in the top display, it could be because the input is below the range of the controller, so check the input parameters. It may also be that the temperature is below the range of the input probe, so change to an input sensor with a lower temperature range. Also, the transmitter or probe could be defective or incorrect, so replace the transmitter or probe. Finally, the temperature may be excessively low for the probe, so raise the temperature.
Describes PID, On/Off, Manual control modes and output capabilities.
Details alarm configuration for high/low acting, deviation, and band alarms.
Covers sample period, A/D converter, fail response, and rejection ratios.
Details accuracy, thermocouple types, impedance, and cold junction compensation.
Explains how to access and set jumpers for current and remote input types.
Details rear terminal connections, conductor standards, and grounding.
Guidance on clean power supply and protection for the controller.
Explains wiring for RTD, Thermocouple, CT, and Remote Input types.
Table listing parameters, descriptions, ranges, and factory settings across loops.
Allows selection of different PID parameter sets for various applications.
Displays and allows changing the active setpoint value or profile segment number.
Covers configuration of input signal type, scaling, and filtering.
Defines the minimum programmable low setpoint value to restrict the range.
Defines the maximum programmable high setpoint value to restrict the range.
Configures cycle time, power limits, fail level, and analog scaling for Output 1.
Configures cycle time, power limits, and fail level for Output 2.
Manages access levels to Display, Parameter, Hidden, and Configuration Loops.
Selects the action for Alarm 1 (e.g., High, Low, Deviation).
Sets the alarm annunciator to Normal or Reverse indication.
Defines alarm reset behavior as Automatic or Latched.
Enables or disables standby mode to prevent nuisance alarms after power-up.
Sets the alarm threshold value based on process units or degrees.
Selects which PID parameter group (1-6) to edit or use for auto-selection.
Includes Integral Time, Derivative Time, Integration Default, and Proportional Band.
Configures communication type, baud rate, data bits, parity, and unit address.
Lists common Modbus registers for reading and writing PXU parameters.
Describes how the process oscillates around the setpoint with hysteresis for stability.
Explains PID control using Proportional, Integral, and Derivative algorithms for precise control.
Details how Auto-Tune automatically determines PID parameters for optimal control.
Lists common Modbus registers for reading and writing PXU parameters.
General| Model | PXU20020 |
|---|---|
| Communication Ports | RS-485 |
| Power | AC Power |
| Certifications | CE, UL, cUL |
| Type | Controller |
| Input Voltage | 100 to 240 VAC |
| Input Type | Thermocouple, RTD, Analog Voltage, Analog Current |
| Output Type | Analog |
| Display | Dual LED |
| Dimensions | 48 x 48 mm |
| Power Consumption | 5 VA max |
| Humidity | 20% to 85% RH (non-condensing) |
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