HW-0006 — HW loop DP reset not functioning
| Status | verified — engine e2ff2f8, cxf:fnv1a128:754dbe3f355e9ba37c4c95e68c10df7b, 2026-08-17 |
| Severity | 3 |
| Method | statistical |
| Phase | 2 |
| Category | EXCESS_CONSUMPTION |
| Confidence | HIGH |
| Estimation | PROXY_ESTIMATION |
| G36 | — |
| Clusters | — |
| Suppresses | — |
| Suppressed by | — |
| Related | HW-0008, CHW-0003, AHU-0024 |
| Playbooks | missing-reset, hot-water-plant-faults |
| Source | PNNL-27338 §4.3.2 (no DP reset; daily MAX−MIN of the loop DP setpoint against a 2.5 psi range), pp. 4.10-4.11; PNNL-27338 §4.2.2 (high loop DP), pp. 4.7-4.8 — establishes pump VFD speed as the HW loop’s load proxy; PNNL-27338 (Katipamula et al. 2018) — adapted via an internal paraphrased deep-read digest, not distributed (rule candidate 5); Sibling-rule precedent: CHW-0003 (window, alarm delay, half-range tolerance), CHW-0002 (sampler+dwell activity conjunct and its NO_EVAL output), AHU-0024; Library extension: HVAC FDD Reference v1.0 ch.14 specifies HW-0001..052 only — index framing in faults/hw/README.md |
| Operating states | Heating season, HW distribution running on variable-speed pumps for the bulk of the evaluation window |
Preconditions (host-enforced): hw_dp_sp must be the setpoint the pumps actually control to — the active value in the pump controller, not a design figure in a schedule table — and hw_pump_vfd_speed must be the speed of a pump on that same loop. On a lead/lag set bind the lead pump: a lag pump’s speed is pinned by staging logic rather than by the building, and it reads flat while the loop swings. On primary/secondary plants bind the secondary (distribution) pumps; a constant-speed primary has no reset to fail. A loop whose pumps have no drive at all must not be bound: there is no DP reset to detect and the speed input has nothing to say. The plant must be running for most of the window — a loop shut down for the summer holds both signals still, and only yPumpSpeedVaried stands between that and a false alarm; evaluability is signalled in-rule by that output, and when it is false the verdict is NO_EVAL, not healthy. Finally, confirm the setpoint point is actually written: a BAS that trends the reset output only while the reset is enabled shows a flat last-known value that no pump is following.
Points: hw_dp_sp, hw_pump_vfd_speed
Outputs:
yFault— True while the HW loop differential-pressure setpoint has stayed flat over the evaluation window despite sufficient pump-speed variation, for at least alarm_delayyPumpSpeedVaried— Evaluability signal — true when HW pump speed has varied enough within the evaluation window for a flat setpoint to mean anything; false means NO_EVAL and the host must ignore yFault
Parameters:
| Name | Default | Unit | CXF path | Description |
|---|---|---|---|---|
evaluation_window | 259200.0 | s | spRef.samplePeriod, pumpRef.samplePeriod, spFlatHeld.delayTime, pumpFlatHeld.delayTime | Window over which setpoint flatness and pump-speed variation are assessed (3 days); drives both baseline sample periods and both dwell timers |
sp_flat_tolerance | 8.625 | kPa | spFlat.t | Max deviation of hw_dp_sp from its sampled baseline to count as flat — half of PNNL-27338 §4.3.2’s 2.5 psi (17.24 kPa) minimum expected setpoint range |
pump_variation_tolerance | 10.0 | % | pumpFlat.t | Max deviation of hw_pump_vfd_speed from its sampled baseline to still count as flat (half an adopted 20-point minimum speed range; PNNL-27338 states no activity gate for this check — see Deviations) |
alarm_delay | 86400.0 | s | persist.delayTime | Fault persistence before alarm (24 h) |
Description
The hot water loop holds one differential-pressure setpoint all winter while the pumps modulate underneath it. Whatever the design-day pressure was is what the loop gets in November and in March, and the coil valves throttle away the surplus. Pump power follows the cube of pressure, so a fifth off the setpoint is roughly half the pump energy, and what buys it is a sequence, not a pump.
This rule is a library extension — the reference’s ch.14 specifies three hot water rules and no reset checks. The detection is grounded in PNNL-27338 §4.3.2, which flags a loop whose DP setpoint moves less than 2.5 psi across a day; the window, the activity conjunct and every block in the graph are this library’s. The pump-speed conjunct is what makes a flat setpoint mean something: a loop that is off, or whose pumps sit at a fixed speed, holds its setpoint flat for reasons that have nothing to do with a missing reset.
Detection Logic
baseline(x) = x sampled and held every evaluation_window (3 days)
sp_flat = |hw_dp_sp − baseline(hw_dp_sp)| < sp_flat_tolerance,
continuously for evaluation_window
pump_flat = |hw_pump_vfd_speed − baseline(hw_pump_vfd_speed)|
< pump_variation_tolerance,
continuously for evaluation_window
yPumpSpeedVaried = NOT pump_flat (false ⇒ host reports NO_EVAL)
yFault = sp_flat AND yPumpSpeedVaried, sustained for alarm_delay
Block graph (rule.cxf.jsonld):
This is CHW-0002’s detector with the heating loop’s points bound to it. Two
symmetric chains compare each signal against a Discrete.Sampler hold refreshed
once per window; the sampler emits the live input on its first tick, so there is
no startup artifact. spFlatHeld asserts only after the setpoint has stayed
within tolerance continuously for a full window, and any reset activity of
8.625 kPa or more restarts it. pumpFlatHeld does the same for speed, and its
negation is yPumpSpeedVaried — “not varied” means a full window of continuous
flatness, so the signal is optimistically true during the first window after
startup, which is harmless because yFault needs that same window.
Both dwell timers fire on the same tick when the loop is flat in both signals,
so the fault conjunction is false by construction on that tick and there is no
boundary race. persist (24 h) filters the remainder, and every TrueDelay
carries delayOnInit = true. Worst-case time to alarm from cold start is
evaluation_window + alarm_delay — 4 days; a loop going flat mid-run alarms
4 days after the setpoint settles. Comparisons are strict, so a signal sitting
exactly on a tolerance falls on the not-flat side.
Possible Diagnoses
The reference algorithm publishes a detection test and no diagnosis list; these are this library’s, in the order a technician should work them.
- Loop DP reset never programmed — the common case, and a desk fix
- Reset programmed but disabled, or the setpoint overridden to a fixed value and the override never released
- Valve-position or zone requests never reach the pump controller, so a correctly written reset has nothing to respond to
- DP sensor mounted at the pump discharge rather than at the hydraulically most remote coil — a pipe-fitting job, and it makes a correct reset impossible to commission
- Reset running but writing to a different point than the one trended — a monitoring artifact and the cheapest thing on the list to rule out
Energy Impact
EXCESS_CONSUMPTION, HIGH confidence, PROXY_ESTIMATION. The savings figure is the
hot water playbook’s: HW supply-temperature reset and DP reset together are
worth 1–3% of site energy, with no published split. The mechanism on this half
is the cubic pump law —
pump_waste_kw = hw_pump_kw × [1 − (1 − DP_reduction/100)³], CHW-0003’s
formula — and it is heating-dominant because that is where the loop runs for
months. Confidence is HIGH for the detection, not for the dollar figure: a flat
setpoint on a modulating loop is about as direct an inference as this library
makes, while the saving depends on surplus pressure these two points cannot
measure.
Emissions Impact
Scope 2, PROXY_EMISSIONS, HIGH confidence. The waste is pump electricity, so it prices at the marginal operating emissions rate and shrinks as the grid does — unlike HW-0008’s fuel-side twin, which a site owns however clean its electricity gets. Typical range 300–3,000 kg CO₂e/yr by analogy with CHW-0003’s chilled water case; no HW-specific figure is published.
Deviations
- This rule extends the reference rather than transcribing it. Ch.14 covers
HW-0001, 051 and 052 only, so there is no reference card behind this one —
no published description, operating states, diagnosis list, tunables line or
test vectors. The detection is paraphrased from PNNL-27338 §4.3.2 (Katipamula
et al. 2018);
name,severityandmethodcome fromfaults/hw/README.md. - Daily MAX−MIN → rolling sampled baseline plus dwell. PNNL’s reset checks run once a day at midnight over the prior day’s array; this engine has no windowed min/max block and no batch clock, a question the library settled at AHU-0023/AHU-0024 and again at CHW-0002/CHW-0003. Detection is equivalent for a setpoint that moves and returns, and slightly conservative for monotonic drift inside one window, where a range test would still call the day flat.
- 2.5 psi becomes an 8.625 kPa half-range. The point dictionary carries
hw_dp_spin kPa and rules do no unit conversion, so it happens here once: 2.5 psi = 17.24 kPa, half-range 8.62, shipped as 8.625 (a 17.25 kPa range). The half-range is the library’s convention, because a signal swinging ±t about a baseline spans 2t. The 0.08% difference from an exact conversion is far below any BAS’s setpoint resolution, and 8.625 is exactly representable in binary, which is what lets the boundary be pinned to the bit. - The 3-day window is adopted from CHW-0003, not from PNNL. PNNL’s window
is one calendar day, which works there because the daily batch discards its
evidence at every midnight; a rolling dwell does not, and a one-day dwell plus
a 24 h alarm delay would fire on any quiet weekend. Three days spans a weekend
plus a working day.
evaluation_windowdrives all four timing parameters together and hosts must set them as a group. - Pump-speed range is the activity conjunct, and it is not CHW-0003’s valve
test. The hot water dictionary has no valve aggregate to bind, so the honest
analog is the load proxy PNNL’s own HW algorithms use (§4.2.2 and §4.4.2 both
test
avg_pump_vfd). What it buys is weaker: pump-speed range answers “is this loop alive and modulating”, not “is any coil starving”. A loop pinned at its DP limit by a starving coil usually runs its pumps flat out, which collapses the speed range and correctly yields NO_EVAL — but a loop that still modulates below full speed against a maxed-out setpoint reads as a missing reset here. HW-0005 (high loop DP) separates those two on the same loop. - The 20-point minimum speed range is adopted, and argued rather than cited.
§4.3.2 has no activity gate at all, so there is no figure to transcribe;
pump_variation_tolerance = 10 %(half-range) follows CHW-0002’s adoptedmin_load_rangein shape and intent — a low bar a live loop clears easily, not a discriminating threshold. A variable-speed loop that never swings 20 points across three days is riding its minimum-speed floor, running against a fixed bypass, or reporting a dead feedback, and NO_EVAL is right in all three. Lowering it makes the rule fire more often, not less. - NO_EVAL is surfaced as
yPumpSpeedVaried, where CHW-0003 ships no evaluability output at all. That rule’s valve test is a conjunct of the fault condition — a starving coil makes the flat setpoint legitimate, not unmeasurable. The pump-speed test here is an evaluability question, which is CHW-0002’syLoadVariedsemantics exactly, and it earns its place as an output rather than an echo by being a stateful window test over the signal’s own baseline. Boolean logic has no tri-state, so the host must read it first: false means NO_EVAL, never healthy. Reals.MovingAveragerejected, and the tick band that follows. The engine implements it with a fixed 64-checkpoint ring, so a three-day window would needdt ≥ 4,114 sbefore it stops silently dropping its oldest samples. No BAS ticks that slowly; AHU-0023 found this and every reset rule since has inherited it. The sampler-and-dwell chain has no lower bound on tick period, and its upper bound is the one to watch — a reset excursion shorter than one tick is invisible to the flatness test, so trend at 5–15 min.- Strict comparisons on both tolerances.
Reals.LessThresholdisu < t, so a setpoint deviating exactly 8.625 kPa clears the flatness dwell and a pump speed deviating exactly 10 points counts as varied. Equality is measure-zero in continuous data and perfectly reachable in a BAS that scales setpoints to fixed increments, so both boundaries are pinned from both sides. alarm_delay= 24 h implemented asTrueDelayon the fault conjunction; the evaluation window itself is enforced by the two flatness dwells.delayOnInit = trueon everyTrueDelay(startup conservatism per AHU-0016), so a rule loaded onto an already-faulted loop still waits the full window plus delay. 24 h is the value every reset rule in this library carries; PNNL’s daily batch has no analog, its evaluation being one shot per midnight.- Two playbooks, where the house habit is one.
missing-resetowns the reset family’s verification step and its Applies-To already reaches past the AHU rules to the CHW pair;hot-water-plant-faultsowns the remedy in its step 3 (reset the loop DP from the most-open valve position). Neither covers the fault alone and both indexes belong to other writers, so this card lists both rather than stretching one. - Blind spots. The rule reads the setpoint, never the pressure: a loop whose setpoint resets correctly while the pumps fail to track it is a different fault. Diagnoses 1–3 produce one signature and cannot be separated here. Diagnosis 4 is worse than invisible — it produces a plausible flat setpoint this rule reports as a missing reset, which is why the playbook’s first step is to find the sensor. A loop cycling on and off around a fixed speed can present a varying speed and a legitimately flat setpoint. And a reset written backwards is a working reset as far as a range test is concerned.
Notes
Fix path is the missing-reset playbook
for the verification step and
hot-water-plant-faults for the
remedy: plot hw_dp_sp against hw_pump_vfd_speed over the window, confirm the
DP sensor sits at the hydraulically most remote coil rather than at the pump,
then program the reset from valve position or zone requests.
clusters is deliberately empty. CLU-02 (“Missing Reset Strategy”) is an
AHU-scoped cluster triggered by AHU-0023, and membership is
clusters/clusters.json’s to declare — the same call CHW-0002 and CHW-0003
made one system upstream. A plant failing both HW-0006 and HW-0008 has one
root cause, which is that nobody commissioned the hot water resets, and it
should be dispatched as one visit.
Test Vectors
9 scenarios, clock step 300 s over 432000 s.
| Scenario | Description |
|---|---|
reset_working | DP setpoint swings 50 kPa every 6 h while the pumps modulate 35-75%; the flatness dwell never completes and nothing alarms |
fixed_setpoint | DP setpoint pinned at 150 kPa while pump speed swings 35-75%; fault asserts at exactly evaluation_window (3 d) + alarm_delay (24 h) = 345600 s, pinned from both sides |
flat_pump_speed_no_eval | NO_EVAL: setpoint flat but the pumps hold one speed all week; yPumpSpeedVaried drops at exactly evaluation_window and yFault never fires |
sp_at_flat_tolerance | Setpoint deviates from its baseline by exactly sp_flat_tolerance (8.625 kPa): strict < puts that on the not-flat side, so no fault |
sp_within_flat_tolerance | Setpoint jitter of 8.5 kPa stays inside sp_flat_tolerance, so it still counts as flat; fault at 345600 s |
pump_speed_at_variation_tolerance | Pump speed deviates from its baseline by exactly pump_variation_tolerance (10%): strict < makes that varied, so the rule stays evaluable and the flat setpoint alarms |
pump_speed_within_variation_tolerance | Pump speed moves only 9.5 points about its baseline, inside pump_variation_tolerance: NO_EVAL at exactly evaluation_window, and the simultaneous setpoint-flat edge cannot race it into a fault |
sp_goes_flat_mid_run | Reset stops working 12 h into the run: the flatness dwell starts at 43200 s, so the alarm lands at exactly 43200 + 259200 + 86400 = 388800 s |
reset_resumes | Setpoint flat for 2 days, then reset activity resumes before the window completes; the dwell restarts and nothing alarms |
vectors.json
{
"schema": "cxf-library/vectors/v1",
"clock": {
"step_s": 300,
"horizon_s": 432000
},
"scenarios": [
{
"name": "reset_working",
"description": "DP setpoint swings 50 kPa every 6 h while the pumps modulate 35-75%; the flatness dwell never completes and nothing alarms",
"inputs": {
"hw_dp_sp": [
{
"t": 0,
"value": 150.0
},
{
"t": 21600,
"value": 100.0
},
{
"t": 43200,
"value": 150.0
},
{
"t": 64800,
"value": 100.0
},
{
"t": 86400,
"value": 150.0
},
{
"t": 108000,
"value": 100.0
},
{
"t": 129600,
"value": 150.0
},
{
"t": 151200,
"value": 100.0
},
{
"t": 172800,
"value": 150.0
},
{
"t": 194400,
"value": 100.0
},
{
"t": 216000,
"value": 150.0
},
{
"t": 237600,
"value": 100.0
},
{
"t": 259200,
"value": 150.0
},
{
"t": 280800,
"value": 100.0
},
{
"t": 302400,
"value": 150.0
},
{
"t": 324000,
"value": 100.0
},
{
"t": 345600,
"value": 150.0
},
{
"t": 367200,
"value": 100.0
},
{
"t": 388800,
"value": 150.0
},
{
"t": 410400,
"value": 100.0
},
{
"t": 432000,
"value": 150.0
}
],
"hw_pump_vfd_speed": [
{
"t": 0,
"value": 35.0
},
{
"t": 21600,
"value": 75.0
},
{
"t": 43200,
"value": 35.0
},
{
"t": 64800,
"value": 75.0
},
{
"t": 86400,
"value": 35.0
},
{
"t": 108000,
"value": 75.0
},
{
"t": 129600,
"value": 35.0
},
{
"t": 151200,
"value": 75.0
},
{
"t": 172800,
"value": 35.0
},
{
"t": 194400,
"value": 75.0
},
{
"t": 216000,
"value": 35.0
},
{
"t": 237600,
"value": 75.0
},
{
"t": 259200,
"value": 35.0
},
{
"t": 280800,
"value": 75.0
},
{
"t": 302400,
"value": 35.0
},
{
"t": 324000,
"value": 75.0
},
{
"t": 345600,
"value": 35.0
},
{
"t": 367200,
"value": 75.0
},
{
"t": 388800,
"value": 35.0
},
{
"t": 410400,
"value": 75.0
},
{
"t": 432000,
"value": 35.0
}
]
},
"expect": [
{
"output": "yFault",
"from_s": 0,
"to_s": 432000,
"equals": false
},
{
"output": "yPumpSpeedVaried",
"from_s": 0,
"to_s": 432000,
"equals": true
}
]
},
{
"name": "fixed_setpoint",
"description": "DP setpoint pinned at 150 kPa while pump speed swings 35-75%; fault asserts at exactly evaluation_window (3 d) + alarm_delay (24 h) = 345600 s, pinned from both sides",
"inputs": {
"hw_dp_sp": 150.0,
"hw_pump_vfd_speed": [
{
"t": 0,
"value": 35.0
},
{
"t": 21600,
"value": 75.0
},
{
"t": 43200,
"value": 35.0
},
{
"t": 64800,
"value": 75.0
},
{
"t": 86400,
"value": 35.0
},
{
"t": 108000,
"value": 75.0
},
{
"t": 129600,
"value": 35.0
},
{
"t": 151200,
"value": 75.0
},
{
"t": 172800,
"value": 35.0
},
{
"t": 194400,
"value": 75.0
},
{
"t": 216000,
"value": 35.0
},
{
"t": 237600,
"value": 75.0
},
{
"t": 259200,
"value": 35.0
},
{
"t": 280800,
"value": 75.0
},
{
"t": 302400,
"value": 35.0
},
{
"t": 324000,
"value": 75.0
},
{
"t": 345600,
"value": 35.0
},
{
"t": 367200,
"value": 75.0
},
{
"t": 388800,
"value": 35.0
},
{
"t": 410400,
"value": 75.0
},
{
"t": 432000,
"value": 35.0
}
]
},
"expect": [
{
"output": "yFault",
"from_s": 0,
"to_s": 345300,
"equals": false
},
{
"output": "yFault",
"from_s": 345600,
"to_s": 432000,
"equals": true
},
{
"output": "yPumpSpeedVaried",
"from_s": 0,
"to_s": 432000,
"equals": true
}
]
},
{
"name": "flat_pump_speed_no_eval",
"description": "NO_EVAL: setpoint flat but the pumps hold one speed all week; yPumpSpeedVaried drops at exactly evaluation_window and yFault never fires",
"inputs": {
"hw_dp_sp": 150.0,
"hw_pump_vfd_speed": 60.0
},
"expect": [
{
"output": "yFault",
"from_s": 0,
"to_s": 432000,
"equals": false
},
{
"output": "yPumpSpeedVaried",
"from_s": 0,
"to_s": 258900,
"equals": true
},
{
"output": "yPumpSpeedVaried",
"from_s": 259200,
"to_s": 432000,
"equals": false
}
]
},
{
"name": "sp_at_flat_tolerance",
"description": "Setpoint deviates from its baseline by exactly sp_flat_tolerance (8.625 kPa): strict < puts that on the not-flat side, so no fault",
"inputs": {
"hw_dp_sp": [
{
"t": 0,
"value": 150.0
},
{
"t": 21600,
"value": 158.625
},
{
"t": 43200,
"value": 150.0
},
{
"t": 64800,
"value": 158.625
},
{
"t": 86400,
"value": 150.0
},
{
"t": 108000,
"value": 158.625
},
{
"t": 129600,
"value": 150.0
},
{
"t": 151200,
"value": 158.625
},
{
"t": 172800,
"value": 150.0
},
{
"t": 194400,
"value": 158.625
},
{
"t": 216000,
"value": 150.0
},
{
"t": 237600,
"value": 158.625
},
{
"t": 259200,
"value": 150.0
},
{
"t": 280800,
"value": 158.625
},
{
"t": 302400,
"value": 150.0
},
{
"t": 324000,
"value": 158.625
},
{
"t": 345600,
"value": 150.0
},
{
"t": 367200,
"value": 158.625
},
{
"t": 388800,
"value": 150.0
},
{
"t": 410400,
"value": 158.625
},
{
"t": 432000,
"value": 150.0
}
],
"hw_pump_vfd_speed": [
{
"t": 0,
"value": 35.0
},
{
"t": 21600,
"value": 75.0
},
{
"t": 43200,
"value": 35.0
},
{
"t": 64800,
"value": 75.0
},
{
"t": 86400,
"value": 35.0
},
{
"t": 108000,
"value": 75.0
},
{
"t": 129600,
"value": 35.0
},
{
"t": 151200,
"value": 75.0
},
{
"t": 172800,
"value": 35.0
},
{
"t": 194400,
"value": 75.0
},
{
"t": 216000,
"value": 35.0
},
{
"t": 237600,
"value": 75.0
},
{
"t": 259200,
"value": 35.0
},
{
"t": 280800,
"value": 75.0
},
{
"t": 302400,
"value": 35.0
},
{
"t": 324000,
"value": 75.0
},
{
"t": 345600,
"value": 35.0
},
{
"t": 367200,
"value": 75.0
},
{
"t": 388800,
"value": 35.0
},
{
"t": 410400,
"value": 75.0
},
{
"t": 432000,
"value": 35.0
}
]
},
"expect": [
{
"output": "yFault",
"from_s": 0,
"to_s": 432000,
"equals": false
},
{
"output": "yPumpSpeedVaried",
"from_s": 0,
"to_s": 432000,
"equals": true
}
]
},
{
"name": "sp_within_flat_tolerance",
"description": "Setpoint jitter of 8.5 kPa stays inside sp_flat_tolerance, so it still counts as flat; fault at 345600 s",
"inputs": {
"hw_dp_sp": [
{
"t": 0,
"value": 150.0
},
{
"t": 21600,
"value": 158.5
},
{
"t": 43200,
"value": 150.0
},
{
"t": 64800,
"value": 158.5
},
{
"t": 86400,
"value": 150.0
},
{
"t": 108000,
"value": 158.5
},
{
"t": 129600,
"value": 150.0
},
{
"t": 151200,
"value": 158.5
},
{
"t": 172800,
"value": 150.0
},
{
"t": 194400,
"value": 158.5
},
{
"t": 216000,
"value": 150.0
},
{
"t": 237600,
"value": 158.5
},
{
"t": 259200,
"value": 150.0
},
{
"t": 280800,
"value": 158.5
},
{
"t": 302400,
"value": 150.0
},
{
"t": 324000,
"value": 158.5
},
{
"t": 345600,
"value": 150.0
},
{
"t": 367200,
"value": 158.5
},
{
"t": 388800,
"value": 150.0
},
{
"t": 410400,
"value": 158.5
},
{
"t": 432000,
"value": 150.0
}
],
"hw_pump_vfd_speed": [
{
"t": 0,
"value": 35.0
},
{
"t": 21600,
"value": 75.0
},
{
"t": 43200,
"value": 35.0
},
{
"t": 64800,
"value": 75.0
},
{
"t": 86400,
"value": 35.0
},
{
"t": 108000,
"value": 75.0
},
{
"t": 129600,
"value": 35.0
},
{
"t": 151200,
"value": 75.0
},
{
"t": 172800,
"value": 35.0
},
{
"t": 194400,
"value": 75.0
},
{
"t": 216000,
"value": 35.0
},
{
"t": 237600,
"value": 75.0
},
{
"t": 259200,
"value": 35.0
},
{
"t": 280800,
"value": 75.0
},
{
"t": 302400,
"value": 35.0
},
{
"t": 324000,
"value": 75.0
},
{
"t": 345600,
"value": 35.0
},
{
"t": 367200,
"value": 75.0
},
{
"t": 388800,
"value": 35.0
},
{
"t": 410400,
"value": 75.0
},
{
"t": 432000,
"value": 35.0
}
]
},
"expect": [
{
"output": "yFault",
"from_s": 0,
"to_s": 345300,
"equals": false
},
{
"output": "yFault",
"from_s": 345600,
"to_s": 432000,
"equals": true
}
]
},
{
"name": "pump_speed_at_variation_tolerance",
"description": "Pump speed deviates from its baseline by exactly pump_variation_tolerance (10%): strict < makes that varied, so the rule stays evaluable and the flat setpoint alarms",
"inputs": {
"hw_dp_sp": 150.0,
"hw_pump_vfd_speed": [
{
"t": 0,
"value": 50.0
},
{
"t": 21600,
"value": 60.0
},
{
"t": 43200,
"value": 50.0
},
{
"t": 64800,
"value": 60.0
},
{
"t": 86400,
"value": 50.0
},
{
"t": 108000,
"value": 60.0
},
{
"t": 129600,
"value": 50.0
},
{
"t": 151200,
"value": 60.0
},
{
"t": 172800,
"value": 50.0
},
{
"t": 194400,
"value": 60.0
},
{
"t": 216000,
"value": 50.0
},
{
"t": 237600,
"value": 60.0
},
{
"t": 259200,
"value": 50.0
},
{
"t": 280800,
"value": 60.0
},
{
"t": 302400,
"value": 50.0
},
{
"t": 324000,
"value": 60.0
},
{
"t": 345600,
"value": 50.0
},
{
"t": 367200,
"value": 60.0
},
{
"t": 388800,
"value": 50.0
},
{
"t": 410400,
"value": 60.0
},
{
"t": 432000,
"value": 50.0
}
]
},
"expect": [
{
"output": "yPumpSpeedVaried",
"from_s": 0,
"to_s": 432000,
"equals": true
},
{
"output": "yFault",
"from_s": 0,
"to_s": 345300,
"equals": false
},
{
"output": "yFault",
"from_s": 345600,
"to_s": 432000,
"equals": true
}
]
},
{
"name": "pump_speed_within_variation_tolerance",
"description": "Pump speed moves only 9.5 points about its baseline, inside pump_variation_tolerance: NO_EVAL at exactly evaluation_window, and the simultaneous setpoint-flat edge cannot race it into a fault",
"inputs": {
"hw_dp_sp": 150.0,
"hw_pump_vfd_speed": [
{
"t": 0,
"value": 50.0
},
{
"t": 21600,
"value": 59.5
},
{
"t": 43200,
"value": 50.0
},
{
"t": 64800,
"value": 59.5
},
{
"t": 86400,
"value": 50.0
},
{
"t": 108000,
"value": 59.5
},
{
"t": 129600,
"value": 50.0
},
{
"t": 151200,
"value": 59.5
},
{
"t": 172800,
"value": 50.0
},
{
"t": 194400,
"value": 59.5
},
{
"t": 216000,
"value": 50.0
},
{
"t": 237600,
"value": 59.5
},
{
"t": 259200,
"value": 50.0
},
{
"t": 280800,
"value": 59.5
},
{
"t": 302400,
"value": 50.0
},
{
"t": 324000,
"value": 59.5
},
{
"t": 345600,
"value": 50.0
},
{
"t": 367200,
"value": 59.5
},
{
"t": 388800,
"value": 50.0
},
{
"t": 410400,
"value": 59.5
},
{
"t": 432000,
"value": 50.0
}
]
},
"expect": [
{
"output": "yPumpSpeedVaried",
"from_s": 0,
"to_s": 258900,
"equals": true
},
{
"output": "yPumpSpeedVaried",
"from_s": 259200,
"to_s": 432000,
"equals": false
},
{
"output": "yFault",
"from_s": 0,
"to_s": 432000,
"equals": false
}
]
},
{
"name": "sp_goes_flat_mid_run",
"description": "Reset stops working 12 h into the run: the flatness dwell starts at 43200 s, so the alarm lands at exactly 43200 + 259200 + 86400 = 388800 s",
"inputs": {
"hw_dp_sp": [
{
"t": 0,
"value": 150.0
},
{
"t": 21600,
"value": 100.0
},
{
"t": 43200,
"value": 150.0
}
],
"hw_pump_vfd_speed": [
{
"t": 0,
"value": 35.0
},
{
"t": 21600,
"value": 75.0
},
{
"t": 43200,
"value": 35.0
},
{
"t": 64800,
"value": 75.0
},
{
"t": 86400,
"value": 35.0
},
{
"t": 108000,
"value": 75.0
},
{
"t": 129600,
"value": 35.0
},
{
"t": 151200,
"value": 75.0
},
{
"t": 172800,
"value": 35.0
},
{
"t": 194400,
"value": 75.0
},
{
"t": 216000,
"value": 35.0
},
{
"t": 237600,
"value": 75.0
},
{
"t": 259200,
"value": 35.0
},
{
"t": 280800,
"value": 75.0
},
{
"t": 302400,
"value": 35.0
},
{
"t": 324000,
"value": 75.0
},
{
"t": 345600,
"value": 35.0
},
{
"t": 367200,
"value": 75.0
},
{
"t": 388800,
"value": 35.0
},
{
"t": 410400,
"value": 75.0
},
{
"t": 432000,
"value": 35.0
}
]
},
"expect": [
{
"output": "yFault",
"from_s": 0,
"to_s": 388500,
"equals": false
},
{
"output": "yFault",
"from_s": 388800,
"to_s": 432000,
"equals": true
},
{
"output": "yPumpSpeedVaried",
"from_s": 0,
"to_s": 432000,
"equals": true
}
]
},
{
"name": "reset_resumes",
"description": "Setpoint flat for 2 days, then reset activity resumes before the window completes; the dwell restarts and nothing alarms",
"inputs": {
"hw_dp_sp": [
{
"t": 0,
"value": 150.0
},
{
"t": 172800,
"value": 100.0
},
{
"t": 194400,
"value": 150.0
},
{
"t": 216000,
"value": 100.0
},
{
"t": 237600,
"value": 150.0
},
{
"t": 259200,
"value": 100.0
},
{
"t": 280800,
"value": 150.0
},
{
"t": 302400,
"value": 100.0
},
{
"t": 324000,
"value": 150.0
},
{
"t": 345600,
"value": 100.0
},
{
"t": 367200,
"value": 150.0
},
{
"t": 388800,
"value": 100.0
},
{
"t": 410400,
"value": 150.0
},
{
"t": 432000,
"value": 100.0
}
],
"hw_pump_vfd_speed": [
{
"t": 0,
"value": 35.0
},
{
"t": 21600,
"value": 75.0
},
{
"t": 43200,
"value": 35.0
},
{
"t": 64800,
"value": 75.0
},
{
"t": 86400,
"value": 35.0
},
{
"t": 108000,
"value": 75.0
},
{
"t": 129600,
"value": 35.0
},
{
"t": 151200,
"value": 75.0
},
{
"t": 172800,
"value": 35.0
},
{
"t": 194400,
"value": 75.0
},
{
"t": 216000,
"value": 35.0
},
{
"t": 237600,
"value": 75.0
},
{
"t": 259200,
"value": 35.0
},
{
"t": 280800,
"value": 75.0
},
{
"t": 302400,
"value": 35.0
},
{
"t": 324000,
"value": 75.0
},
{
"t": 345600,
"value": 35.0
},
{
"t": 367200,
"value": 75.0
},
{
"t": 388800,
"value": 35.0
},
{
"t": 410400,
"value": 75.0
},
{
"t": 432000,
"value": 35.0
}
]
},
"expect": [
{
"output": "yFault",
"from_s": 0,
"to_s": 432000,
"equals": false
}
]
}
]
}