Watlow Series 922 Retrofit Manual de usuario descargar pdf (Pagina 88)

WATLOW Series 922 User's Manual

Appendix

Glossary, O - R

OUT: Select an output type. Action in response to the difference

between set point and process variable.

Output: Action in response to difference between set point and process

variable.

Overshoot: Condition whereby temperature exceeds set point due to initial

power up or process changes.

PB1C/PB2C: A proportional temperature band for Channel 1 or Channel 2

expressed in degrees within which a temperature controller

proportioning function is active for cooling expressed in

degrees.

PB1H/PB2H:: A proportional temperature band for Channel 1 or Channel 2

expressed in degrees within which a temperature controller

proportioning function is active for heating. Expressed in

degrees.

P control: Proportioning control.

Parameter: A physical property whose value determines the response of

an electronic control to given inputs.

PD control: Proportioning control with rate action.

PI control: Proportioning control with auto-reset.

PID: When ACCESS (1) is entered in the Series 922, the PID

parameters will appear. These parameters consist of Propor-

tional, Integral (auto reset), and Derivative (rate) actions.

PID control: Proportioning control with auto-reset and rate.

Process Variable: Thermal system element to be regulated, such as time

temperature, relative humidity, etc.

Programmed display Displayed information which gives the operator/programmer

data: the "programmed" or intended process information, i.e.,

intended set point, intended alarm limit, etc. See "Actual

displayed data."

Proportional band: The span of temperature about the set point where time

proportional control action takes place.

Proportioning

control: See Time proportioning control.

R1H/R2H: Represents a high limit to set point for Channel 1 or Channel 2.

The default values are also the high limits of your input type.

R1L/R2L: Represents a low limit to set point for Channel 1 or Channel 2.

The default values are also the low limits of your input type.

Rate: Anticipatory action that senses the rate of change of tempera-

ture and compensates to minimize overshoot. Also "deriva-

tive."

Rate Band: A thermal control band that defines where the rate (derivative)

function begins. A Watlow rate band occurs centered on set

point at one or more times the width of the proportional band.

RB1C/RB2C: The thermal control band for cooling in Channel 1 or Channel 2

that defines where the rate (derivative) function begins.

1 2 ... 83 84 85 86 87 88 89 90 91 92 93 ... 126 127

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