Sigma Control Basic
Basic is deliberately stripped: no sequencing, no full event log. If a customer needs fleet control, they need Sigma Control 2 or a Sigma Air Manager.
Manufacturer
Kaeser
Display
Monochrome LCD with icon row and 4 keys plus LED status.
Years produced
~2012 – present, on small rotary screws.
Power supply
24 VDC from package control transformer.
Ambient range
0 – 45 °C.
Protection rating
IP54 front.
Relay outputs
Motor contactors, inlet valve solenoid, venting valve, common alarm.
Used on
- Kaeser SX / SM / SK small rotary screws
- AIRCENTER packages of the same frames
Features
- DUAL and CONTINUOUS control modes
- Two maintenance counters (fluid/filter, separator)
- Weekly timer on select builds
- Automatic restart after power failure (option, disabled by default)
Interfaces
- Volt-free alarm and run contacts
- Remote start/stop
- Optional Modbus module
Sensor inputs
- Airend discharge temp (PT1000)
- Internal pressure
- Network pressure
Fault code lookup
First checks
- Fluid level
- Cooler core cleanliness — small packages foul fast in shop air
- Thermal valve
First checks
- Amp draw vs nameplate
- Check for restricted cooling airflow around the enclosure
First checks
- Inlet valve not closing on unload
- Venting valve stuck
- Compare sensor to gauge
First checks
- Swap two legs at the disconnect
First checks
- Service and reset the specific counter
Fault list is non-exhaustive and firmware-dependent. Always confirm against the controller’s on-screen help or OEM manual.
Sensor pin resistance & signal values
Pin-level resistance and signal values for the sensor types this controller uses. Works offline. De-energise the panel and lift one lead before ohming any element.
Wiring notes
- Single 24 V rail feeds the controller and the solenoids — a shorted solenoid coil takes the display down with it, which looks like a dead controller
- Remote start/stop is dry-contact only
Known issues & field notes
- Small packages are often installed in closets; over-temperature trips are usually room ventilation, not the compressor
Operator settings open; service parameters require a dealer code.
Manuals & literature
Kaeser — support portal
Manuals gated — request via local rep or parts portal
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