Primary States (Fan Supply Duct Static Control) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 16.0

Controller Tool Help
Product
Controls > Control Tools > Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
16.0
Revision date
2023-10-02

  • Off: The fan is off when the module is in this mode of operation.

  • Min: The analog fan output (Supply Fan Percent Cmd) is zero and the fan control output (Supply Fan OnOff) is on when the module is in this mode of operation.

  • Emergency On: When the mode is Emergency S-P and the pressure sensor is not reliable, the module enters this state and turns on the fan while retaining its last value for the fan percent command.

  • Ramp: The supply fan slowly changes from its initial speed to 100% at a rate defined by the ramp rate input. This mode may be used during the Start/Stop sequence to start the fan in a controlled fashion.

  • S-P Control: The module controls the supply duct static pressure to the duct static pressure setpoint while the module is in this mode of operation.

The following table describes the State Output dependencies on FSCS SF Cmd, Mode, and Duct Static Pressure reliability inputs.

Table 1. Fan Supply Duct Static Control Command Hierarchy

FSCS SF Cmd

Mode

Duct Static Pressure Reliable

State

Off

*

*

Off

On

*

TRUE

S-P Control

FALSE

Emergency On

Auto

Off

*

Off

Min

*

Min

Ramp

TRUE

Ramp

FALSE

Off

S-P Control

TRUE

S-P Control

FALSE

Off

Emergency S-P Control

TRUE

S-P Control

FALSE

Emergency On

Emergency Off

*

Off