Profire Energy PF3100 Tuning Manual
Pid tuning guide
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Also See for PF3100:
- Software setup manual (23 pages) ,
- Troubleshooting manual (21 pages) ,
- Manual (21 pages)
Related Manuals for Profire Energy PF3100
Summary of Contents for Profire Energy PF3100
- Page 1 PROFIRE PID Tuning Guide November 2017 PROFIRE PID Tuning Guide PROFIRE 1.855.776.3473 solutions@profireenergy.com Page 1 of 16...
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Page 2: Table Of Contents
PROFIRE PID Tuning Guide 1. Introduction ..............................3 Functional Description ........................... 3 2. PF3100 – PID Parameters ..........................3 Proportional Band (PB) ..........................3 Integral Time (Ti) ............................4 Derivative Time (Td) ............................4 3. Cascaded PID ..............................5 How to Set-up a Cascaded PID ........................6 How to Set-up PID Staging .......................... -
Page 3: Introduction
The PID control system is used to maintain a stable process temperature by adjusting the signal to a proportional control valve, which in turn will control the flow of fuel to the burner. In the PF3100 system, PID settings can be accessed in two ways: 1. From the controller Status screen: select Settings,... -
Page 4: Integral Time (Ti)
PROFIRE PID Tuning Guide Integral Time (Ti) The integral term accelerates the movement of the process temperature towards setpoint and eliminates the residual steady-state error that occurs with a pure proportional controller. The larger the input error (error = setpoint – temperature) the greater the effect of the integral term. The smaller the integral time, the quicker the system will increase the output. -
Page 5: Cascaded Pid
PROFIRE PID Tuning Guide 3. Cascaded PID Two PID controllers can be used together to yield better dynamic control. In cascade control, one PID controls the setpoint of another. One controller (PID 1) acts as an outer loop (primary temperature) controller, which controls the setpoint of the second controller (PID 2). -
Page 6: How To Set-Up A Cascaded Pid
PROFIRE PID Tuning Guide How to Set-up a Cascaded PID 1. Understand the process that will be controlled, and the requirements of the process. 2. Allocate the primary process temperature to the process temperature that is directly heated by the fuel gas. -
Page 7: How To Set-Up Integral Jacketing
PROFIRE PID Tuning Guide Primary In Range When the primary temperature is above the primary setpoint minimum, the system will control from the secondary temperature. In this case, the primary setpoint maximum is ignored because the low fire setpoint handles the high side. Secondary In Range When the secondary temperature is above the secondary setpoint minimum and below the secondary setpoint maximum, the system will control from the secondary temperature. -
Page 8: How To Set-Up Pid Ramp Time
PROFIRE PID Tuning Guide How to Set-up PID Ramp Time The PID Ramp Time setting is accessed by navigating to the Settings tab and selecting Advanced PID Config. This will display the PID Ramp Time setting. When the burner transitions from pilot to low fire, it will open the TCV to the minimum TCV opening. The system will then wait for 30 seconds before entering PID control. - Page 9 The derivative term allows for a PID controller to predict future error by calculating derivatives of the error or input. PF3100 PID controllers take the derivative of the input measurement rather than the error. This is a standard PID feature which prevents large output swings when the setpoint is changed. When the setpoint increases, the error term increases instantaneously.
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Page 10: Pid Tuning Key Points
PROFIRE PID Tuning Guide PROFIRE recommends avoiding the derivative term. A well-tuned derivative term allows the controller to respond quickly with minimal overshoot, but a well-tuned PI controller can also achieve this with a slightly slower response time. Unless the application requirements are very tight, there’s no need to involve the derivative term. - Page 11 PROFIRE PID Tuning Guide Tuning P & I Parameters for a Single Loop 1. Start with a proportional band of 5°C, keeping the integral and derivative times set to 0, and run the system to a steady state near the desired setpoint. 2.
- Page 12 PROFIRE PID Tuning Guide 3. In the Data tab under Data Charting, enable live updating and select OK. PROFIRE 1.855.776.3473 solutions@profireenergy.com Page 12 of 16...
- Page 13 PROFIRE PID Tuning Guide 4. From this screen: Use the +/- keys to size the graph. Ideally, the system should oscillate four times before stabilizing. If the process does not oscillate at all then the proportional band will need to be increased. If the process oscillates too much, then the proportional band should be decreased.
- Page 14 PROFIRE PID Tuning Guide 7. At this point there will be a waiting time for the system to run during which the chart should be observed. If the process is unstable, then increase the proportional band by 20%. If after adjustments have been made the system is still unstable or too sluggish, the integral can be adjusted.
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Page 15: Troubleshooting Pid Tuning
Sometimes valves get stuck and don’t respond as expected. If the system has been tuned and is behaving abnormally, take some time to ensure that the valves connected to the PF3100 are at the positions they are being set to by the system. If there is a disparity between two, try power cycling the valves. -
Page 16: Profire Contact Information
PROFIRE PID Tuning Guide 6. PROFIRE Contact Information If you have any concerns or questions about this information, please contact PROFIRE as follows: U.S. 1.801.796.5127 321 South, 1250 West Suite 1 Lindon, UT 84042, USA solutions@profireenergy.com CANADA 1.780.960.5278 Box 3313, Bay 12, 55 Alberta Ave Spruce Grove, AB T7X 3A6, Canada solutions@profireenergy.com...
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