Valve Setup

 

Valve 1 – 4

This option will allow the user to set up the valves for the 9215.  There is a choice of four valves.

 

Initial Scale

The Initial Scale option will allow the user to set the initial scale for the valve. This value must be less than or equal to the Valve Max value.

 

Full Scale

This option will allow the user to set the full scale for the vale.  This value must be less than or equal to the Valve Max value.

 

Trim Enable

This option will allow the user to set the trim enable option for the valve.  The options are Yes or No.

 

Setpoint

The Setpoint option will allow the user to set the target setpoint for the valve.  This value must be less than or equal to the Valve Max value.

 

Trim Range

This option will allow the user to set the trim range for the valve. This value must be less than or equal to the Valve Max value.

 

Initial SP Scale

This option will allow the user to set the zero scale for the setpoint. This value must be less than or equal to the Valve Max value.

 

Full SP Scale

This option will allow the user to set the full scale for the setpoint.  This value must be less than or equal to the Valve Max value.

 

Valve Max

This option will allow the user to set the maximum flow rate for the valve.  The range is 0 to 32767.

 

Deviation setpoint

This option will allow the user to set the deviation setpoint for the valve. The range is 0 (OFF) to 32000.

 

Deviation alarm delay

This option will allow the user to set the deviation alarm delay, listed in 1/10th of minutes.  The range is 0 to 32000.  Note: The alarm delay is entered in 1/10th of a minute intervals, but it is displayed in seconds, so 3/10 of a minute = 18 seconds.

 

Gas Type

This option will determine the gas type for the valve. Certain gas types must be selected for certain valves:

 

Valve 1 – N2 (Nitrogen)

Valve 2 – NH3 (Ammonia)

Valve 3 – DA (Dissociated Ammonia), NH3 (Ammonia), MISC (Other gas type), Endo (Endothermic gas), N2 (Nitrogen), CO2 (Carbon Dioxide), O2 (Oxygen), NO2 (Nitrogen Dioxide)

Valve 4 – H2 (Hydrogen), NH3 (Ammonia), MISC (Other Gas Type), Endo (Endothermic Gas), N2 (Nitrogen), CO2 (Carbon Dioxide), O2 (Oxygen), NO2 (Nitrogen Dioxide)

 

NOTE: If Endothermic gas is selected, a gas composition of 40% H2 is assumed.

 

If working with an FNC/Nitriding application, gases must be set up as follows for KN/DA atmosphere control:

 

Valve 1 – Nitrogen (N2)

Valve 2 – Ammonia (NH3)

Valve 3 – DA (if Dissociated Gas is available)

 

NOTE: DA gas must be set as Valve 3 to be used for control if KN or DA is set as the Atmosphere PV Type (see Furnace Setup).

 

Valve Decimal Place

This option will set the decimal place for the valve.  The range is 0 through 4.

 

Flow Signal

This selects the source of the flow data for the selected valve

 

  • RS-485 means that a flow instrument is assigned to the instrument number assigned to the selected valve (e.g., Client instruments 7 to 10 are for valves 1 to 4).

 

  • PLC without local scaling means the data is read from the PLC locations as if they are in Engineering units.

 

  • PLC with local scaling means the data read from the PLC is in raw A/D counts and must have zero and span values defined in the controller.

 

  • SSI AIB /4 -20MA means an analog input board is used to read the flows: Input 1 for valve 1, input 2 for valve 2, etc.

 

Note 1: For all selections except RS-485, the flow setpoints are sent to an analog output board at instrument 24: Output 1 for valve 1, output for valve 2, etc.

 

Note 2: All selections are mutually exclusive and can occur in any combination.

 

Tracking Mode (Valves 3-4)

 

Note about tracking: Valves 1 and 2 track based upon the type of control or nitrider setup. Valves 3 and 4 can be set to no tracking, track total flow, or track NH3. Only settings for valves 3 and 4 can be changed.

 

When valve 3 or valve 4 is selected, the tracking mode can be selected among none (no tracking), % of total flow (% of the total flow of the three non-selected valves) and % of NH3 flow (% of NH3 flow among the NH3 valves).

 

In the case of % of total flow:

  • If both valves 3 and 4 and set to track % of total flow, only valves 1 and 2 are included in the total flow calculation.

  • If valve 3 is set to track % of total flow, but valve 4 is not set to track % of total flow, % of total flow will be calculated from valves 1, 2, and 4.

  • If valve 4 is set to track % of total flow, but valve 3 is not set to track % of total flow, % of total flow will be calculated from valves 1, 2, and 3.

     

Tracking Percent (Valves 3-4)

 

Note about tracking: Valves 1 and 2 track based upon the type of control or nitrider setup. Valves 3 and 4 can be set to no tracking, track total flow, or track NH3. Only settings for valves 3 and 4 can be changed.

 

When valve 3 or valve 4 is selected, this option can be used to set a percentage of the tracking source as the setpoint for the valve. The possible range is 0.0 to 100.0 percent. An example of how the tracking percent option can be used is as follows: Assume that the tracking mode is % of NH3 flow and that the tracking percent is 50%. Also assume that NH3 is flowing 86 units. In that example, the setpoint for the valve will be 43 units.