I would like a value to be either true or false depending on 1. if the pump is running 2. the average motor current is less than 5 for 5 minutes or more i have tried event frames and if statements, the closest I have got is this: pump_avg_curr = a calculation that takes the average current between 3 PI tags for the pump pump_state = a tag that lets us know if the pump is "RUNNING" or "STOPPED" pump_alarm = if 'pump_state' = "RUNNING" and TagAvg('pump_avg_curr', *, *-5m) <= 5 then TRUE else FALSE This works except once the pump starts running - it is using the values from before the pump started running (which is 0) in its calculation. So everytime a pump turns on, the alarm is on (reading TRUE) any help would be appreciated. thanks

how to write an equation to create an alarm based on pump's motor current value and state of pump WITHOUT event frame

I would like a value to be either true or false depending on

1. if the pump is running

2. the average motor current is less than 5 for 5 minutes or more

i have tried event frames and if statements, the closest I have got is this:

pump_avg_curr = a calculation that takes the average current between 3 PI tags for the pump
pump_state = a tag that lets us know if the pump is "RUNNING" or "STOPPED"
pump_alarm = if 'pump_state' = "RUNNING" and TagAvg('pump_avg_curr', *, *-5m) <= 5 then TRUE else FALSE

This works except once the pump starts running - it is using the values from before the pump started running (which is 0) in its calculation. So everytime a pump turns on, the alarm is on (reading TRUE)

any help would be appreciated. thanks

0 Community User over 2 years ago

You probably should verify that the pump is in the Running state for five minutes to prevent incorrect alarms. Perhaps you can use the TimeEq function and do something similar to TimeEq('*-5m','*','pump_state',"RUNNING") =300 and then tagAvg('pump_avg_curr', *, *-5m) <= 5 then TRUE else FALSE
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