Watlow CAS200 Manual de usuario descargar pdf (Pagina 71)

CAS200 User’s Guide Chapter 4: Setup

Watlow Anafaze 59

• Any digital output can be assigned to one or more

process variable alarms. The output is active if any of

its alarms are active. All alarm outputs are active Low

or active High, depending on the Digital Output

Polarity On Alarm parameter setting.

• Low process and low deviation alarms activate when

the process variable goes below a value you set. They

remain active until the process variable goes above

that value plus the deadband. (The diagram below

shows these alarms.)

When the scanner powers up or the setpoint changes,

deviation alarms do not activate until the process goes

inside the deviation alarm band, preventing deviation

alarms during a cold start. (High and low process alarms

are always enabled.)

Use menus to set the following process alarm parameters

for each channel:

• High and low process alarm type, setpoint, and digital

output

• High and low deviation alarm type, deviation alarm

value, and digital output

• Alarm deadband

• Alarm delay

The set points, deviation alarm values, and deadband all

use the same decimal format as the channel's process

variable.

High Alarm Limit

}Deadband

SP + Deviation

SP - Deviation

Set Point

Low Alarm Limit

Low process alarm on

Low process alarm off

Low deviation alarm on

High process alarm on

High process alarm off

High deviation alarm on

High deviation alarm off

Low deviation alarm off

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Watlow CAS200 Manual de usuario Pagina 71