Application

Sequence of Operation

Venturi Table Evaluation and Editing (Mode 1, 3)

Siemens Industry, Inc.

Application Note, App 2920

140-1307

2015-07-07

2. Edit the inactive table values.

 Since you have just switched the active and inactive portions of the table in

Step 1, the inactive values are now identical to what the active values were

moments ago. You can now edit these new inactive values by using V TABLE

PT to reference them in TABLE FLOW and TABLE VOLTS. The Table

Venturi

Air Valve Table Statement

explains this in more detail.

3. Set V TABLE PT once again to the swap value. This places the newly edited

inactive values back into the active portion of the table statement (again, the active

and inactive portions of the table are simply swapped). However, before the swap

is finalized, the application analyzes your proposed values using the same logic as

in a regular calibration sequence.

⇨

If your proposed values are good, then the swap is made and the edited

values are accepted into the active supply (or exhaust) portion of the

table. Depending on which portion of the table you were editing, SUP

VLV STAT or GEX VLV STAT is marked PASS and control of the

Venturi Air Valve resumes.

⇨

However, if it is marked FAIL, you must gather and view the voltage/flow

values to see where the problem lies.

NOTES:

1. If

SUP FLO COEF is 0, the table edit feature uses a supply flow coefficient of 1.

2. If SUPDUCT AREA is 0, the table edit feature uses a supply duct area of 1 square

foot.

3. If

GEX FLO COEF is 0, the table edit feature uses a general exhaust flow

coefficient of 1.

4. If

GEXDUCT AREA is 0, the table edit feature uses a general exhaust duct area of

1 square foot.

The following table lists all values for V TABLE PT and describes their use.

Venturi Air Valve Table Statement

TABLE

Description

Default value for V TABLE PT. When V TABLE PT equals 0, changes to

TABLE FLOW or TABLE VOLTS are ignored. Setting V TABLE PT to 0

cancels an edit session.