Configuration
Function Prompt |
| Selection or Range of Setting |
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| Parameter | |||
Lower Display |
| Upper Display |
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| Definition | |||
English | Numeric |
| English | Numeric |
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| Code |
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| Code |
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| PDMR | 3 |
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| PD WITH MANUAL RESET is used | |
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| whenever integral action is not wanted for | |||
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| automatic control. The equation is computed | |
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| with no integral contribution. The MANUAL | |
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| RESET, which is operator adjustable, is then | |
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| added to the present output to form the | |
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| controller output. | |
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| Switching between manual and automatic | |
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| mode will be bumpless. | |
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| If you select PD with Manual Reset you can | |
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| also configure the following variations: | |
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| • PD (Two Mode) control, | |
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| • P (Single Mode) control. | |
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| • Set Rate (D) to 0. | |
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| Other prompts affected: |
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| ATTENTION | |
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| MANRST in the Tuning Set Up group | |
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| TPSC | 4 |
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| THREE POSITION STEP CONTROL | |
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| algorithm allows the control of a valve (or | |
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| other actuator) with an electric motor driven | |
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| by two controller relay outputs; one to move | |
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| the motor upscale, the other downscale | |
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| without a feedback slidewire linked to the | |
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| motor shaft. The deadband is adjustable in | |
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| the same manner as the duplex output | |
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| algorithm. | |
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| The Three Position Step Control algorithm | |
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| provides an output display (OUT) which is an | |
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| estimated motor position, since the motor is | |
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| not using any slidewire feedback. Although | |
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| this output indication is only an | |
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| approximation, it is “corrected” each time the | |
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| controller drives the motor to one of its stops | |
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| (0 % or 100 %). It avoids all the control | |
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| problems associated with the feedback | |
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| slidewire (wear, dirt, noise). When operating | |
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| in this algorithm, the estimated OUT display | |
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| is shown to the nearest percent (i.e., no | |
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| decimal). | |
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| Refer to the Operation section for motor | |
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| position displays. | |
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| As a customer configurable option, when a | |
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| second input board is installed, the motor | |
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| slidewire can be connected to the controller. | |
48 | UDC2500 Universal Digital Controller Product Manual | 4/07 |
