Watlow CAS200 - Manual (Page 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
} Deadband
} Deadband
} 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