DC_LINK_CTRL
DC-link supervision — proportional brake-chopper duty with hysteresis, resistor energy budget, line-filter ripple monitoring and an over-voltage trip.
When to use it
Use DC_LINK_CTRL when a traction DC link has a brake chopper and an input filter, and the supervisory layer has to fire the chopper proportionally, protect the resistor from its own energy, and trip the link when the chopper cannot hold it.
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 | — |
| DC_LINK | REAL | V |
| DC_OK | BOOL | — |
| V_NOM | REAL | V |
| OV_LIM | REAL | V |
| CHOP_ON_V | REAL | V |
| CHOP_HYST_V | REAL | V |
| UV_LIM | REAL | V |
| OV_TMO | TIME | — |
| R_CHOP | REAL | ohm |
| E_MAX_MJ | REAL | MJ |
| COOL_KW | REAL | kW |
| E_REL_PCT | REAL | % |
| TAU_S | REAL | s |
| RIPPLE_LIM_V | REAL | V |
| RIPPLE_TMO | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| CHOPPER_PCT | REAL | % |
| FILTER_OK | BOOL | — |
| DC_TRIP | BOOL | — |
| REGEN_INHIBIT | BOOL | — |
| INV_INHIBIT | BOOL | — |
| RIPPLE_V | REAL | V |
| CHOP_ENERGY_MJ | REAL | MJ |
| RES_HOT | BOOL | — |
| ALM_UV | BOOL | — |
| ALM_DC_FAULT | BOOL | — |
| MEAS_VALID | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
DC_LINK_CTRL commands a real actuator. It is written to sit underneath your own interlock, permissive and protection logic — not to replace it. Commission it as you would any control block you wrote yourself.
Validation evidence
- Tests
- 10
- Simulated scans
- 221
- 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
- Conforms to IEC 61499
Download DC_LINK_CTRL — free
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