Determine if equip. amperage is higher than historical average

Applicable Systems

Primary: AHU, RTU, MUA, ERV, BLR, CHLR
Secondary: HP, FCU, UV, UH

Objective/Method/Outcome

Objective: Determine if a motor is drawing a higher amperage value than typical historical recorded values.

Method: Check if the motor amperage is higher than the calculated 1-year average during occupied hours.

Outcome: An insight is generated if the motor amperage is more than the historical average by more than 15%.

Logic

Average Motor Speed = Average over past Year(Motor Speed)
If(Motor Amperage > Average Motor Speed + Percent Error * Average Motor Speed) {return true;}

Determine if equip. amperage is higher than historical average

Notes

This only applies to motors without VFD, which operate at consistent power consumption levels.

Inputs

AMPS (Real Trend Log)

Parameters

Parameter	Expression Block Series Number	Description	Default Value (Units)
Acceptable Percent Error	35	The acceptable percent deviation the motor speed is allowed above its average.	15 (%)
Acceptable Hours per Week	37	The amount of time that this error is allowable for the unit per week. Anything more than that time is considered a fault.	12 (h)