Application
Water and wastewater
Unmanned pump stations that report a dry-run trip over 4G instead of flooding a basement overnight.
The machine
Pump stations, dosing and filtration
A pump station is a level sensor, two or three pumps, a valve and a telemetry link, usually in a wet pit with no network cable and no one on site. Dosing adds a flow meter and a chemical pump; filtration adds differential pressure and a backwash sequence.
The failure modes are predictable: a blocked intake, a dry run, a burst line, a dosing pump that lost prime. Each has a sensor signature, and each is worth a message rather than a site visit.
The control
What has to happen, and fast enough
An IoT HMI with a 4G module plus an FAs controller covers the station: 4–20 mA level and pressure on 16-bit analogue inputs, pump control on relay or transistor outputs, and Modbus RTU to the variable frequency drives. Alarms push to a phone and to a messaging account, and the historical record keeps the last 20,000 events.
For a pit installation, the IP67 panel removes the need for a sealed enclosure door — and the condensation problem that comes with it.
Recommended hardware
A typical bill of materials for this machine
These are the models the export desk quotes most often for this application — not the only valid combination.
| Function | Recommended | Why |
|---|---|---|
| Operator panel | SK-070QS-G | 7-inch IoT panel, 4G module, IP65 front |
| Controller | FAs-32MT-AC-E | Relay or transistor outputs, Modbus RTU to the drives |
| Analogue | S-E4AI2AO | Four 16-bit inputs and two outputs for level, pressure and valve |
| Sealed variant | SK-070QF | IP67 over the whole unit for wet pits |
I/O counts and axis counts assume a mid-range machine. Send the actual list and the quotation will be sized against it.
Engineering notes
What usually goes wrong
- A dry-run trip should be an alarm push, not a shutdown with a lamp in a locked cabinet.
- Use 4–20 mA rather than voltage for level and pressure: the loop survives a long cable and a wet junction box better.
- Record pump run-hours in the controller so maintenance is scheduled on hours, not on a calendar.
- Keep a local HMI screen even on a 4G site — the commissioning engineer needs it before the SIM is active.
Send the machine, not the model
Describe the axes, the I/O and the market it ships to. We answer with a model code, a cut-out check and a landed-cost quote — usually within one business day.
Next step
Tell us what the machine has to do.
Send the axis count, the I/O list or a photo of the existing panel. You get a model recommendation, a wiring note and a quote — usually within one business day.