Primary States (Heating 2 Position Valve with DA-T Low Limit) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 16.0

Controller Tool Help

Brand
Johnson Controls
Metasys
Product name
Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
16.0
Revision date
2023-10-02
Language
English
  • Off: Output is commanded to 0%.

  • Max: Set the Percent Cmd to 100%. This value then feeds through the MSC and the valve opens accordingly based on the timer settings.

  • Limited Max: Set the output to the limited max value. This value then feeds through the MSC and the valve opens and closes accordingly based on the timer settings.

  • Hold: Output holds its current value. The MSC turns the valve on and off using the Minimum On and Off times, the valve continues to cycle to provide the percent cmd being held. If the Output Overridden input is true, the Output Position input is passed to the Heating Percent Cmd.

  • Water Flush: Set the Percent Cmd output to 100%. This value continues to feed to the MSC and the valve opens by the sequencer.

  • Control: Adjust the output to control the Process Variable. As this Percent Cmd varies, it causes changes to the opening and closing of the valve from the MSC. If the input PID Tuning Reset is true, the Reset Tuning input to the PID is set to true causing the PID to recalculate its tuning parameters. While that occurs, the Heating Percent Cmd is held at its last value.

  • Control Limit: Adjust the output to control the Low Limit Process Variable. As this Percent Cmd varies, it causes changes to the opening and closing of the valve from the MSC.

  • Failsoft: The Percent Cmd is set to the Failsoft Value. This value then feeds through the MSC and the valve opens and closes accordingly based on the timer settings.

Table 1. Heating 2 Position Valve with DA-T Low Limit Command Hierarchy

Mode

PID Tuning Reset

State

Off

*

Off

Max

*

Max

Limited Max

*

Limited Max

Hold

Reset 1st PID

Control Limit

Hold

*

Hold

Water Flush

*

Water Flush

Control

*

Control

Control Limit

*

Control Limit

Failsoft

*

Failsoft