Section 18 • Auxiliary Input / Output

•High Alarm:

•This defines the upper limit of the input value, that when exceeded will generate an alarm.

•Low Trip:

•Defines the lower limit of the input value that when exceeded will generate a trip.

•High Trip:

•Defines the upper limit of the input value that when exceeded will generate a trip.

Analog Outputs

This screen allows to map any standard analog input or auxiliary input to any of the four analog auxiliary out- puts. There are two pages of auxiliary output configura- tion, each consists of two analog auxiliary outputs.

•Active Input:

•Active Input can be selected from avail- able standard analog inputs or auxiliary inputs. Selected Active Input gets mapped to auxiliary output.

•Run Always:

•“Run Always” option can be selected to en- able mapped auxiliary output irrespective of the compressor’s run state. If “Run Always” is not selected then the mapped auxiliary output is enabled only when compressor is running.

•Trigger:

•Trigger configuration is used to enable / dis- able auxiliary output according to the config- ured trigger input. Trigger input can be selected from available standard analog inputs , auxiliary analog inputs or digital inputs. Trigger value and differential in combination with trigger type (“enable if above / On” or “enable if below / Off”) enables or disables auxiliary output.

Control

Auxiliary outputs can be PID Controlled or Scalable Controlled.

P = Proportional (gain):

•Used to adjust the auxiliary output in direct propor- tion to the difference between the control setpoint and the active input . The proportional term is a unit less quantity and is used for coarse adjustment. This

setpoint should be set to the lowest value that gives adequate control system response. Increasing the proportional setting increases the control system’s sensitivity to small process fluctuations and the ten- dency to hunt.

I = Integral (reset):

•Used to integrate the error over time, to account for a small error that has persisted for a long time. This quantity is used for fine adjustment. This setpoint is used to smooth out process variations. This setpoint should be set high enough to prevent hunting but not too high or it will cause control system overshoot.

D = Derivative (rate):

•Used to account for how fast the error is changing, positively or negatively.

Scalable Control:

•Minimum Input / Maximum Input:

•These setpoints defines minimum and maxi- mum Input range for configured active input .

•Minimum Output / Maximum Output:

•These setpoints defines minimum and maxi- mum output. The Auxiliary output produces a linear value based on these settings.

Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153

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Emerson 20/20 service manual Analog Outputs, Control
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20/20 specifications

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