Alarm Setup

The 9205 controller can be configured to use three (3) different alarms. Each of the alarms consists of an alarm setpoint, alarm source, alarm type, alarm hysteresis, smart alarm, ON delay time, and a 0 SP blocks alarm value. The alarms come from the factory with a default configuration dependent on the application but also can be modified prior to shipment to your facility or in the field by a supervisor. See the section Appendix E – Factory Default Settings for the 9205 Controller for more information on factory default settings for the alarms.

 

Setpoint

This value is the setpoint for the alarm.  Clicking on this value will display an input box from which the user can select a new value.  The range is from
–32767 to 32767.

 

Alarm Source

This option will indicate the source of the alarm.  The options are:

PV 1 Value

PV 2 Value

PV 3 Value

Input 1 Value

Input 2 Value

Input 3 Value

Output 1 Value

Output 2 Value

Output 3 Value

 

Alarm Type

This value is the type of alarm used.  Options are:

Process High

Process Low

Band, Normally Open

Band, Normally Closed

Deviation, Normally Open

Deviation, Normally Closed

 

Band alarm works by looking at a value above and below setpoint. Deviation alarm works by looking at a value either above or below (based upon the setpoint value the user has entered). A few examples would probably be best to explain how to set these up properly.

 

Hysteresis

This value is the Hysteresis value.  The Hysteresis is a set number that works with the alarm to help control a motor or pump longer to reach a set amount to come back into band before it will shut off motor or pump.

 

Example: Using quench oil as an example, suppose the SP is 200 °F.  The alarm is set as a deviation of +10 °F.   At 210 °F, the alarm is active and the pump will run to cool the oil.  With a hysteresis of 8 °F, the alarm and pump will turn off at 202 °F.   It will turn back on when it is 10 °F above setpoint.  If the setpoint is still 200 °F, then at 210 °F, it will turn on again.

 

Clicking on this value will display an input box from which the user can select a new value.  The range is from -32767 to 32767.

 

Smart Alarm

This value is a display of the Smart Alarm status.  A smart alarm is an alarm that works with a Process Variable (PV), and, when enabled, it will not be active until the PV is within band of the setpoint. The alarm sounding - if active - will be disabled until within the SP band. When it is in band, the alarm will go active unless on delay time is set.

 

Example:  If the SP is 1700 °F and the band is 10 °F, the alarm will not be active until the PV reaches 1690 °F.  The value can be either disabled or enabled.

 

ON Delay Time

This value is the On Delay Time for the alarm.  Clicking on this value will display an input box from which the user can select a new value.  The range is from -32767 to 32767.

 

0 Setpoint Blocks Alarm

This value will allow a 0 setpoint to block an alarm.  The options are either No or Yes.

 

BO/Impedance inhibits alarm

If BO/Impedance inhibits alarm is turned to Yes, no alarm will sound if the carbon percentage drops because of a burnoff.

 

Inhibit Source

Alarms can be inhibited in order to prevent false or unnecessary alarm notifications. The Inhibit Source option will allow the user to set the source of the inhibit signal. The options are: None, Input 1 – Input 4,

Soak timer inactive (The alarm will not happen if the furnace is in a soak if this option is selected), and .

Input 6 – Input 15.

 

Disable on open input

An alarm can be disabled when an input the open in order to avoid false or unnecessary alarms. This option will allow the user to specify if the alarm is disabled when the input is open.  The options are either no or yes.

 

The Return button will return the user to the menu screen.