West Control Solutions MRC 7000 Profiler Manual - Manual (Page 47)

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To return to the Control mode of operation from the Manual mode, press the specified AUTO/
Man key. If the Automatic Transfer feature is selected in the Program mode, the instrument
will switch from Manual mode to the Control mode when process value reaches the setpoint
value.
Alarm Operation 4.2
There are two alarms available per pen. The type of alarm is selected in the Program mode
as follows:
1. Process Alarm Direct - the alarm will be On if the process value is greater than the process
value selected.
2. Process Alarm Reverse - the alarm will be On if the process value is less than the process
value selected.
3. Deviation Alarm Direct - the alarm will be On if the process value is greater than the
setpoint plus the deviation value selected.
4. Deviation Alarm Reverse - the alarm will be On if the process value is less than the
setpoint plus the deviation value selected.
5. Deviation Band Alarm Open Within - the alarm will be On if the process value is greater
than one half the deviation band alarm values selected above or below the setpoint.
6. Deviation Band Alarm Close Within - the alarm will be On if the process value is less than
one half the deviation band value selected above or below the setpoint.
The alarms will be active while the instrument is in the Control mode. Relay and solid state
relay drivers can be assigned to provide output capability for the alarm functions.
The alarm value (Process deviation or bandwidth) is selected in the Tune mode.
Alarm outputs chatter can be reduced by using the hysteresis for the alarm output adjustable
in the Program mode to create a deadband around the alarm point.