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PID Temperature Controller

PID Temperature Controller. Allen Bradley 1771-TCM Brian Van Eyk. Background. Applications Plastic injection molding Powder paint There is a need for quick and accurate temperature control Two solutions Sensor with simple logic controller Smart I/O controller. Allen Bradley 1771-TCM.

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PID Temperature Controller

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  1. PID Temperature Controller Allen Bradley 1771-TCM Brian Van Eyk

  2. Background • Applications • Plastic injection molding • Powder paint • There is a need for quick and accurate temperature control • Two solutions • Sensor with simple logic controller • Smart I/O controller

  3. Allen Bradley 1771-TCM • Uses PID controller • 8 independent control loops • Heating or cooling control • Auto-Tuning software • Speeds up design • Accurate gains • Analog or digital control • Standard PLC-5 rack mount

  4. Control Loops • Thermocouples used for feedback • Open loop detection • Disable unit or output constant value • Data collected in the TCM is given to the PLC • PLC controls actuator

  5. PID Auto-Tuning • Auto-Tune calculates PID gains • Gains are stored in TCM module • Gains must be read into PLC data table • TCM can be set to slow, medium or fast response time • TCM memory is volatile • TCM must have gains sent to it or auto-tune whenever power to the module is lost

  6. PID Fine-Tuning Fine tuning can be done manually • Too much overshoot • Decrease P and I • Increase D • Too slow • Increase P and I • Decrease D

  7. Analog vs. Digital Control • TCM module has two possible outputs: • Analog control allows PLC to set the temperature of the heating / cooling device • Digital control gives the PLC the duty cycle for the actuator

  8. Alarms • Alarms can be set • High and low temperature alarm values • High and low deviations • Can use with dead band or without • Alarm is sent to the PLC • The PLC programmer can do what they want with the alarm

  9. Mounting • Termination panel mounted separately • Standard DIN style • Mount in panel near thermocouples • Two cables from termination panel to TCM • Provides more accurate temperature readings

  10. Questions • Cost - $3,150

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