Watlow CAS Manual de usuario descargar pdf (Pagina 68)

58 CAS User’s Guide

Setup

•

High process and high deviation alarms activate when the process

variable goes above a value you set. They remain active until the

process variable goes below that value minus the deadband. (See the

diagram below.)

•

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 global

alarm output polarity 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 dia-

gram 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 digi-

tal output

•

Alarm deadband

•

Alarm delay

The setpoints, deviation alarm values, and deadband all use the same

decimal format as the channel's process variable.

h Alarm Limit

Setpoint

Low Alarm Limit

SP + Deviation

SP - Deviation

}

Deadband

}

Deadband

}

Deadband

}

Deadband

h deviation alarm on

h deviation alarm off

Low deviation alarm on

Low deviation alarm off

h process alarm off

h process alarm on

Low process alarm on

Low process alarm off

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