Applicable Systems
- Primary: CHLR, BLR
Description / Method
Monitors two equipment status or command TLs, and counts the number of times they are being enabled (ON) at the same time. Generates an insight if the equipment turns ON at the same time for more than once a week (user adjustable). Generates a CTL for weekly counts. {BLR,CHLR}
Logic
Normalize all inputs to 5 minute intervals. Check each equipment is on (amps above threshold). Sum the times over the week that both values are true.
sum time over the week { Temp_Diff = CHLR_Temp - CHLR_SP if(Temp_Diff = 0, No_Insight, Insight_Flag) }
Diagnosis / Recommended Action
- Review and optimize the control sequence so that units can be staged rather than enabling them simultaneously. The time delay allows to monitor and evaluate the actual demand.
Message
Units that should be staged are enabled at the same time without sufficient delay. Please review equipment control.
Notes
All time-spans and thresholds are adjustable. Additional unit status or command trend logs could be added if the system involves more than two units (example: three chillers, three boilers etc.). Input TLs use 5 min constant normalization.
Defaults used: Constant-Weekly_Sum_Threshold: 1 Unit ON Analog Threshold: 1
Rule Template Type
- Insight Type: Fault Detection
- Trigger Type: Active High
Default Priority
Medium
Inputs
Inputs | Units | Tags | Description |
---|---|---|---|
Unit 1 Binary/Analog Status {} | 0/1 or Amps | status|cmd | Equipment 1 On/Off Indicator |
Unit 2 Binary/Analog Status {} | 0/1 or Amps | status|cmd | Equipment 2 On/Off Indicator |
Constants
Inputs | Units | Default Value | Description |
---|---|---|---|
Unit ON Analog Threshold | Amps | 1 | Analog amperage threshold for equipment is on. Set this to 1 when using binary input |
Constant-Weekly Sum Threshold | hours | 1 | Threshold hours per week that both equipment are running |
Output Calculated Trend Logs
Output CTL | Units | Frequency | Description |
---|---|---|---|
Weekly_count_units_enabled_simultaneously | hours | weekly | Cumulative time that both units are on for the week. |