Supply fan command and status signals are mismatched
Objective/Method/Outcome
Objective: Determines if the return signals of the supply air fan are matching
Method: Compares the Command and Status to check if the command and status signals are active at the same time, to find out the hours of fault.
Outcome: Triggers an insight if the hours of fault are greater than the acceptable hours of fault.
Description
Compares the status and command signals to determine if there is a mismatch.
This rule is part of the CopperTree Standard rule-set.
Default Priority
High
Diagnosis
- Check if the equipment is manually overridden.
- Check interfacing relays.
- Check status sensors.
Message
Supply fan command-status signals do not match. Please investigate unit control.
Rule Template
Insight Type: Fault Detection
Trigger Type: Active High
Logic
Inputs
| Input | Unit | Tags | Description |
|---|---|---|---|
| Command | Discharge Air Fan Command | The recorded supply fan command | |
| Status | Discharge Air Fan Status | The recorded supply fan status | |
| Acceptable Hours of Fault per Week | The allowable hours of fault beyond which an insight is triggered | ||
| Cost per Hour | $ | The cost of fault per hour | |
| Days of operation annually | The days of operation of the fan per year used to project potential savings |