DL405 Frequently Asked Questions
DL405 Frequently Asked Questions
Product Selected: DL405
Category Selected: PID
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| Question: Why can I not get any Control Output from my PID loop? |
| Answer: Most likely you haven't entered a high limit for your Control Output in the PID setup. The default is 0 and the maximum is 4095 binary. Your must enter something in this field (Word+31) from the PID setup or from ladder. You should also check your Control Output word (Word+5) to see if you are actually getting Control Output. If this value is changing then make sure you are writing this value to the physical output device. This will most likely be an analog card or Time-Proportioning ladder for a discrete output point. |
| FAQ ID: 132 |
| Question: Why does my Setpoint Value change in my PID loop when I go from Manual to Auto from the PID view or ladder? |
| Answer: You are probably in Bumpless Transfer Mode 1. In this mode, the Setpoint Value is forced to the Process Value on a manual to auto transition. You should be using Bumpless Transfer Mode 2 if you do not want this to occur. This is covered in the Bumpless Transfer section of the PID chapter in your User Manual. |
| FAQ ID: 133 |
| Question: Does the D4-450 support autotune? |
| Answer: Autotune feature is available with firmware v1.90 or later. Also need DS32 build 58 or 62. |
| FAQ ID: 706 |