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Advanced Operations
6.3.3.7 Function set to PWM CONTROL/PID CONTROL working mode
PWM CONTROL/PID CONTROL
| SET FUNCTION | Default value: LINEAR | |
| The 2nd SET FUNCTION menu sets the PWM signal status. | ||
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| LINEAR | Signal is linearly dependent on the process value. |
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| PID CONTROL | Signal works as a PID controller. |
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| Default value: 0% |
| SET TRANSFER | Sets a substitute PWM ratio when some error conditions are detected in the selected source or if | |
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| the source is missing. |
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| SET MODE | Default value: AUTOMATIC | |
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| AUTOMATIC | The relay output works as a PID controller. |
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| MANUAL | The relay output has got an on/off ratio as set in the menu MANUAL OUTPUT. |
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| MANUAL OUTPUT | Indicates the current on/off ratio. | |
| Additionally the on/off ratio can be set (condition: SET MODE is set to MANUAL). Note that this | ||
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| ratio cannot exceed a value beyond the values set in the MINIMUM and MAXIMUM menus. | ||
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| PHASE | Default value: DIRECT | |
| Reverses the leading sign of the control deviation for the PID controller. | ||
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| MINIMUM | Default value: 0% | |
| Sets the minimum PWM ratio. | ||
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| MAXIMUM | Default value: 100% | |
| Sets the maximum PWM. | ||
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| SET POINT | Default value: 10 | |
| Sets the process value which is controlled by the PID controller. | ||
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| Default value: 1 |
| DEAD ZONE | The dead zone is a band around the set point. In this band the PID controller does not change | |
| the PWM on/off ratio output signal. This band is determined as set point +/- dead zone. The | ||
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| dead zone stabilizes the PID controlled system which have a tendency to oscillate. |
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| PERIOD | Default value: 5 seconds | |
| Sets the cycle duration of the PWM output signal. | ||
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| Default value: 1 |
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| Sets the proportional part of the PID controller. |
| PROPORTIONAL | The proportional part of the controller generates an output signal which is linearly dependent to | |
| the control deviation. The proportional part reacts on any changes at the input but starts to | ||
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| oscillate easily if the value is set high. The proportional part cannot completely compensate |
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| disturbances. |
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| Default value: 15 minutes |
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| Sets the integration part of the PID controller. |
| INTEGRAL | The integration part of the controller generates an output signal. The output signal increases | |
| linearly if the control deviation is constant. The integration part responds slower than the | ||
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| proportional part and can completely compensate disturbances. The higher the integration part, |
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| the slower it responds. If the integration part is set to low, it starts to oscillate. |
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| Default value: 5 minutes |
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| Sets the derivative part of the PID controller. |
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| The derivative part of the PID controller generates an output signal which depends on the control |
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| deviation changes. The faster the control deviation changes, the higher the output signal gets. |
| DERIVATIVE | The derivative part creates an output signal as long as the control deviation changes. If the | |
| control deviation is constant, no signal is created. | ||
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| The derivative part is able to smoothen the oscillation caused by the proportional part. The |
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| derivative part allows the proportional part to be set higher and the controller responds faster. |
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| If there is no knowledge about the controlled process behavior, it is recommended to set this part |
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| to “0”, because this part tends to oscillate strongly. |