Table 3 Details of RBC-Nesbitt fault scenarios.
From: Labeled Datasets for Air Handling Units Operating in Faulted and Fault-free States
Fault type | Fault intensity | Date: yy/mm/dd (start-finish time) | Method of fault imposition |
|---|---|---|---|
System stopped working (Chiller off) | — | 16/07/06 (16:00-23:00) | Naturally occurred fault. |
AHU-1 supply air temperature bias | −4 °F | 16/08/08 (10:22-21:16) | Overriding demand adjust by 2. |
+4 °F | 16/09/07 (10:30-22:09) | ||
System stopped working (Chiller off) | — | 16/09/11 (18:30-20:30) | Turning off the chiller from 6:30 p.m. to 8:30 p.m. |
AHU-2 outdoor air damper stuck higher than normal position | 90% open | 16/12/01 (10:00-20:45) | Overriding the AHU-2 outdoor air damper control signal* to be 90% open. |
80% open | 17/01/03 (10:00-20:30) | Overriding the AHU-2 outdoor air damper control signal to be 80% open. | |
Occupied during the unoccupied-scheduled period | — | 17/01/14 (1:30-7:00) | Naturally occurred fault. |
Chiller stopped earlier than scheduled | — | 17/07/09 (4:00-15:30) | Naturally occurred fault. |
AHU-2 outdoor air damper stuck higher than normal position | 90% open | 17/07/11 (10:00-20:01) | Overriding the AHU-2 outdoor air damper control signal to be 90% open. |
100% open | 17/07/18 (11:00-20:01) | Overriding the AHU-2 outdoor air damper control signal to be 100% open. | |
Chiller supply chilled water (CHWS) temperature sensor bias | −4 °F | 17/08/03 (10:00-21:27) | Overriding the CHWS temperature setpoint from 44 °F to 48 °F on control panel. |
HVAC system occupied earlier than scheduled | — | 17/08/05 (4:00-8:00) | Changing the system schedule to be occupied from 4:00 a.m. |
AHU-2 cooling coil valve position software override at higher-than-normal position | 100% open | 17/08/11 (10:05-20:06) | Overriding the cooling coil valve control signal to be 100% open. |
Chiller chilled water differential pressure (DP) sensor positive bias | 0.1 psi | 17/09/15 (10:30-15:21) | Overriding the DP setpoint from 7.5 to 0.5. |
AHU-2 supply air temperature sensor bias | −3.5 °F | 18/07/09 (10:15-20:15) | Overriding the supply air temperature ‘setpoint demand adjust’ point by 1.75. |
AHU-2 outdoor air damper stuck at higher than the normal position | 30% open | 18/07/10 (10:30-20:30) | Overriding outdoor air damper control signal to be 30% open (normal mode: 15% open). |
AHU-2 cooling coil valve stuck at higher than the normal position | 80% | 18/07/11 (10:00-20:00) | Overriding the cooling coil control signal to be 80% open (normal mode: 40-60% open). |
AHU-2 outdoor air damper stuck at higher than the normal position | 60% open | 18/07/18 (9:30-19:30) | Overriding the outdoor air damper signal to be 60% open (normal mode: 15% open). |
Change weekend occupied schedule to end at 8:20 p.m. | — | 18/07/22 (20:20-21:40) | Turning off the HVAC system at 8:20 p.m. |
CHWS temperature sensor bias | −3.0 °F | 18/07/23 (8:00-18:00) | Changing the CHWS temperature setpoint from 44 °F to 47 °F. |
