Logix (aftermarket / OEM shared)
Common on medical-air and lab-air scroll skids. The controller name 'Logix' shows up on multiple OEM panels — always confirm firmware and I/O map before swapping.
Manufacturer
Multiple (originally Powerex / Champion small units)
Display
2-line 20-char LCD with 4 status LEDs.
Years produced
Late 1990s – present, multiple hardware families.
Power supply
24 VDC control, 120 VAC input.
Ambient range
0 – 46 °C.
Protection rating
IP54 front.
Relay outputs
One contactor coil output per scroll head + alarm + dryer.
Used on
- Powerex medical scroll modules
- Champion small-frame commercial units
- OEM-branded remakes on various shop compressors
On AirCompDX
Features
- Pressure-based cycling of 2–4 scroll heads
- Hour equalization / lead-lag rotation
- Alarm relay output
Interfaces
- RS-485 Modbus RTU (option)
- 24 VDC I/O
- Digital dryer output
Sensor inputs
- Per-head discharge temp
- System pressure (4–20 mA)
- Optional dewpoint
Common fault codes
First checks
- Check head cooling fan
- Verify inlet filter
- Test thermistor / RTD
First checks
- Check leaks
- Verify head loading sequence
- Confirm pressure sensor calibration
First checks
- Verify sensor calibration; check safety relief
First checks
- Check contactor & overload
- Verify motor winding continuity
Fault list is non-exhaustive and firmware-dependent. Always confirm against the controller’s on-screen help or OEM manual.
Wiring notes
- 24 VDC control, 120 VAC contactor coils; one contactor per scroll head
Known issues & field notes
- Hour equalization drifts if a head is manually disabled — reset lead/lag pointer after service
- Alarm relay wetted vs dry-contact varies by OEM build — verify before wiring to plant BMS
Manuals & literature
Powerex — support portal
Manuals hosted per-product — search model below
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