Step 4 in the Station Builder Help menu directions below on how to create a Cascaded PIDF control mode is not possible to perform because Cascaded PIDF is not an available option under the Controller: types available in the drop-down list (Figure 1).
How to Create a Cascaded PIDF Control Mode
Before you can create a Cascaded PIDF control mode, you must create a base control mode (primary control loop).
- In the Station Builder navigation pane, select the channel for which you wish to create this mode.
- Click the Control Modes tab, and then select an input resource for the secondary control loop (Active fdbk) by performing one of the following:
- Click the Station tab of the Input Resources list, select a station input (from the current channel or Auxiliary Inputs), and click “+”, or
- Click the Hardware tab of the Input Resources list, select a hardware resource input for the control mode, and click “+”.
Keep your resource names short because long names may not be visible in all windows.
- Enter the desired display and internal name for the control mode.
- Select Cascaded PIDF for Type.
- Select the desired Cascaded Type.
- Select the desired Base control mode.
- Enter the desired display and internal names for the Active fdbk input, and then select the desired Dimension and Display Units. This input pertains to the Cascaded PIDF control mode’s secondary control loop.
- Optional—allocate a resource for Stabilization (and if available, Stabilization 2).
Figure 1 – Missing Cascaded PIDF in the Controller: drop-down list
There is no control mode type called Cascaded PIDF. The Help menu instructions are inaccurate. A Cascaded PIDF control mode is setup in Station Builder as follows:
1. Select your inner loop control mode resource and assign a desirable controller type, like Basic PIDF and Displacement (Figure 1):
Figure 1 – Selecting the inner loop control mode in Station Builder for a Cascaded PIDF control mode
2. Select your outer loop control mode resource and assign desirable control type, like Basic PIDF and Force (Figure 2).
Figure 2 - Selecting the outer loop control mode in Station Builder for a Cascaded PIDF control mode
3. Select the base control mode as you inner loop, i.e., Displacement and pick the Compensation Type – Amplitude Control Only or Mean and Amplitude Control. More information on this can be found in the 793 Control Software manual under "About compensation types".
This creates an outer loop force control mode over an inner loop displacement control mode each with its own Basic PIDF controllers.