Cooling tower fan command and status signals are mismatched

Objective/Method/Outcome

Objective: Determines if the command and status signals of cooling tower 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: Trigger 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 ruleset.

Default Priority

High

Diagnosis

  1. Check if equipment is manually overridden.
  2. Check interfacing relays.
  3. Check status sensors.

Message

Cooling tower fan command-status signals do not match. Please investigate unit control.

Rule Template

Insight Type: Fault Detection

Trigger Type: Active High

Logic

Logic for determining if cooling tower fan command and status signals are mismatched

Inputs

InputUnitTagDescription
Command Cooling Tower Fan Command The recorded Cooling Tower Fan command
Status  Cooling Tower Fan Status The recorded Cooling Tower Fan status
Acceptable Hours of Fault per Week   The allowable hours of fault
Cost per Hour$  The cost per hour of the fault
Days of operation annually   The estimated yearly days of operation to project annual savings