Madimack InverFlow Pumps
InverFlow pumps accept Modbus over RS-485 or four dry-contact digital inputs. Two things decide whether the install behaves: disabling self-priming, and understanding that the digital inputs outrank the bus.
Disable self-priming first
- Disable the default self-priming function in parameter 6.
- Parameter 7 sets the self-priming recheck time if you want to keep priming but shorten it.
- The cycle can also be exited by hand at the pump, which is useful during commissioning but is not a substitute for turning it off.
Control priority
RS-485, the preferred route
Land the pump's RS485-A and RS485-B on a PORT. This is the option worth taking: one pair of conductors, full speed control rather than four fixed steps, and it leaves the module's dry contacts free for other equipment.
| Madimack | iSmart Module |
|---|---|
| RS485-A | PORT terminal A |
| RS485-B | PORT terminal B |
Digital inputs, the fallback
Where the bus is not available, four digital inputs give fixed speed steps. Each is driven from a dry contact on the module using COM and N.O so it rests open.
| Input | Effect when active |
|---|---|
| Digital input 1 | Pump forced to stop |
| Digital input 2 | Run at 100% |
| Digital input 3 | Run at 80% |
| Digital input 4 | Run at 40% |
| None active | Returns to its last known state and panel control |
When it does not respond
| Symptom | Where to look first |
|---|---|
| Runs at its own speed for the first half hour | Self-priming still enabled. Parameter 6. |
| Modbus commands ignored | A digital input is asserted. Check for the DI icon on the pump screen. |
| No communication at all | Swap RS485-A and RS485-B, then check address and baud rate. |
| Panel will not respond either | A digital input is active — the panel locks out by design. |
| Wrong speed on a digital input | The default percentage behind that input was changed in the parameter settings. |
Sources
- Madimack InverFLOW Plus Pool Pump Installation Manual (US) — external control priority, digital input behaviour, RS485-A/B Modbus connection and the self-priming parameters
- iSmart Module relay driver board — KiCad schematic and BOM. PORT A-D are an unbuffered RS-485 pass-through carrying A, B and G; H1/H2 and AUX1/AUX2 are the only dry relay contacts