Commissioning Instructions

Before You Begin
Configuring Airflow Control — Application 2942
29
Siemens Industry, Inc. Start-up Procedures 140-1321
Restricted 2015-11-04
PID Loop Only Operation (Mode 2)
NOTE:
The default P gain value is intended for PID operation in conjunction with the Venturi
table. When operating without the Venturi table the application is slower to respond.
Therefore, you should adjust the P gain as needed when operating in PID Only mode
to ensure acceptable performance.
The Venturi calibration table initially contains all zeros by default, that is, it contains no
calibration information. When the application detects a zero flow for the sixteenth entry
(the table entry with the highest flow), the application does operate, but runs with
only
PID control. If PID Only control is satisfactory for a given job, there is no need to
populate the Venturi tables.
Open Loop Operation (Mode 3)
To operate open loop control with manual entry of Venturi table:
1. Set OPEN LOOP to YES to indicate that the actuator is to operate open loop.
2. Use the Venturi Table Evaluation and Editing procedure. For additional information
on the open loop table values, see appropriate application manual.
To operate open loop control with automatic entry of Venturi table:
1. Temporarily connect an AVS flow sensor to the application.
2. Temporarily set OPEN LOOP to NO.
3. Initiate the Venturi calibration sequence as described earlier in this document
4. Remove the flow sensor.
5. Set OPEN LOOP to YES to indicate that the respective actuator is to operate open
loop.
Tuning the Flow Loops (Mode 1, 2)
NOTE:
This procedure does not apply to Venturi actuators that are configured to run open
loop.
CAUTION
Adjusting P gains (supply and/or exhaust) to values greater than 0.1 may cause
system instability.