CHILLER_SEQ
Chiller plant staging on measured load with a look-ahead stage-down test and an anti-cycle delay.
When to use it
Use CHILLER_SEQ when a chilled-water plant of equally sized machines must add and shed chillers on measured plant load without hunting, and the last machine must not be allowed to stop under a data hall that still needs cooling.
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 | — |
| PLANT_KW | REAL | kW |
| KW_OK | BOOL | — |
| CAP_PER_CHILLER | REAL | kW |
| N_AVAIL | USINT | — |
| UP_PCT | REAL | % |
| DN_PCT | REAL | % |
| DELAY | TIME | — |
| MIN_LOAD_KW | REAL | kW |
| PULSE_T | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| N_RUN | USINT | — |
| STAGE_UP | BOOL | — |
| STAGE_DN | BOOL | — |
| LOAD_PCT | REAL | % |
| VALID | BOOL | — |
| ALM_NO_CAPACITY | BOOL | — |
| ALM_NO_AVAIL | BOOL | — |
| ALM_KW_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
Validation evidence
- Tests
- 9
- Simulated scans
- 386
- 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
Download CHILLER_SEQ — free
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