Elektronikon Mk4
Legacy but still widely deployed. Firmware and menu tree vary by year — always confirm against the machine's data plate.
Manufacturer
Atlas Copco
Display
2-line alphanumeric LCD with function keys.
Years produced
~2002 – 2011 (superseded by Mk5 / Graphic / Touch).
Power supply
24 VDC via unit transformer.
Ambient range
0 – 55 °C.
Protection rating
IP54 front.
Relay outputs
Star/delta contactors, blowdown, alarm, dryer, common warning.
Replaced by
Elektronikon Mk5 / Graphic / Touch
Used on
- GA 5–90 (older builds)
- ZR/ZT (early)
- GX series
Features
- Load/unload control
- Delayed second stop (DSS)
- Weekly timer
- Service hour tracking
Interfaces
- RS-232 (service)
- RS-485 Modbus RTU (option)
- Elektronikon expansion bus
Sensor inputs
- Element outlet temp (PT100/PT1000)
- Vessel/line pressure (4–20 mA)
- Ambient temp
Common fault codes
First checks
- Check cooler & fan
- Verify oil level and cooler cleanliness
- Test PT sensor
First checks
- Inspect connector
- Check 4–20 mA loop
- Swap sensor to isolate
First checks
- Reset OL
- Measure phase currents
- Check contactor mechanical
First checks
- Verify E-stop reset
- Check panel door interlocks
Fault list is non-exhaustive and firmware-dependent. Always confirm against the controller’s on-screen help or OEM manual.
Wiring notes
- 24 VDC I/O
- Star/delta relays K1/K2/K3 driven from controller
- Optional expansion module for dryer/aftercooler I/O
Known issues & field notes
- Membrane keypad wears out — replace as an assembly
- CR2032 backup battery: lose all timers if unpowered > 30 days
Service menu code is Atlas Copco proprietary — most sites use factory default 1234 unless changed at commissioning. Contact your Atlas Copco rep for the current service code.
Manuals & literature
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