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;}
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) |
