Hot/Chilled Water System – Pump speed and status are mismatched

Objective/ Method/Outcome

Objective: Determines if the pump status and speed signals are matching.

Method: Compares the pump status and speed signals to check if their activity matches and generates an insight when a mismatch occurs for greater than the defined daily threshold. Avoidable Cost and Potential savings are determined based on an hourly cost of faulty operation.

Outcome: This rule generates an insight.

Description

This rule compares the status and speed signals to determine if there is a mismatch. This rule is part of the CopperTree Standard rule-set.

Default Priority

Medium

Diagnosis

1. Check if the equipment is manually overridden.

2. Check VFD speed readings.

3. Check status sensors.

Message

Pump status-speed signals do not match. Please investigate unit control.

Rule Template

Insight Type: Fault Detection

Trigger Type: Active High

Inputs

InputUnitTagsDescription
Pump Status Chilled Water Pump Status, Hot Water Pump Status, Chiller Condenser Water Pump Status 
Pump VFD Speed Hot Water Pump VFD Speed, Chilled Water Pump VFD Speed, Chiller Condenser Water Pump VFD Speed 
Acceptable Hours of Fault per DayHours The minimum hours of fault that can trigger an insight
Weeks of Operation  The annual weeks of operation
Cost per Hour$ The defined hourly cost of faulty operation

Notes

1. Expected values for “Pump Status” inputs are “0” or “1”.

Default Values:

Const. – Acceptable Hours of Fault per Day: 2

Const. – Cost per Hour [$]: 0 Const. – Weeks of Operation: 26