Maestro XB
Very long service life on rotary-vane machines — the controller often outlives the shop it's installed in.
Manufacturer
Mattei
Display
3.5-inch color LCD with 4-button navigation.
Years produced
~2010 – present.
Power supply
24 VDC, 3.5-inch color LCD.
Ambient range
0 – 46 °C.
Protection rating
IP54 front.
Relay outputs
Across-the-line contactor, blowdown, dryer, alarm.
Used on
- Mattei ERC/ERC-N rotary vane compressors
- Optimair (larger frame)
Features
- Vane-specific logic (no separator ΔP menus)
- Multi-unit sequencing (up to 4)
- Trend & fault log
Interfaces
- RS-485 Modbus RTU
- Ethernet (Modbus TCP, option)
Sensor inputs
- Rotor discharge temp
- Line pressure
- Oil filter ΔP (option)
Common fault codes
First checks
- Cooler cleanliness
- Oil level (vane machines are oil-critical)
- Verify RTD
First checks
- Verify pressure sensor
- Check unload solenoid & inlet valve
First checks
- Reset OL
- Phase currents
- Contactor mechanical
Fault list is non-exhaustive and firmware-dependent. Always confirm against the controller’s on-screen help or OEM manual.
Wiring notes
- Compact panel — leave slack in harness for door swing
- Mattei-specific inlet valve solenoid on dedicated relay
Known issues & field notes
- Vane compressors are sensitive to oil grade — do NOT substitute screw-compressor fluid
- Backup battery ~5-year life; timers lost when depleted
Manuals & literature
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