BLOWER_MOV_CTRL
Most-open-valve blower header pressure optimisation with demand-based and pressure-based blower staging and a latched cannot-hold alarm.
When to use it
Use BLOWER_MOV_CTRL when several aeration zones share one blower header, each zone holds its own dissolved oxygen with a modulating air valve, and the header pressure setpoint is to be trimmed down to the lowest value that still satisfies the neediest zone.
Interface
The published port signature. This is the whole of what the block exposes to your program — the implementation body is not shown here and ships with the download.
Inputs
| Port | Type | Unit |
|---|---|---|
| ENABLE | BOOL | — |
| MAX_VALVE_PCT | REAL | % |
| P_HEADER | REAL | kPa |
| P_HEADER_OK | BOOL | — |
| P_MIN | REAL | kPa |
| P_MAX | REAL | kPa |
| P_FAIL | REAL | kPa |
| MOV_TARGET_PCT | REAL | % |
| MOV_BAND_PCT | REAL | % |
| TRIM_RATE_KPA_MIN | REAL | kPa/min |
| AIR_DEMAND | REAL | Nm3/h |
| BLOWER_CAP | REAL | Nm3/h |
| N_AVAIL | USINT | — |
| P_DEV_KPA | REAL | kPa |
| STAGE_T | TIME | — |
| HOLD_T | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| P_SP | REAL | kPa |
| N_BLOWERS | USINT | — |
| N_FROM_DEMAND | USINT | — |
| MOV_IN_BAND | BOOL | — |
| TRIMMING_UP | BOOL | — |
| TRIMMING_DOWN | BOOL | — |
| AT_P_LIMIT | BOOL | — |
| ALM_CANNOT_HOLD | BOOL | — |
| ALM_P_FAULT | BOOL | — |
| ALM_NO_BLOWER | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
Validation evidence
- Tests
- 9
- Simulated scans
- 1152
- Simulator
- v0.1.0
Complete IEC 61131-3 implementation with a published test suite that runs on the vplant simulator. The counts above are that suite, executed on this build.
- Conforms to IEC 61131-3
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