Quincy Power$ync II / III
Quincy branded units built by Atlas Copco after the 2009 acquisition share many Elektronikon-style sensor layouts, but keep OEM-specific fluid (QuinSyn) and separator part numbers.
Manufacturer
Quincy Compressor
Display
Power$ync III: 4.3" color touch; Power$ync II: 4-line LCD.
Years produced
Power$ync II ~2010 – 2018; Power$ync III ~2018 – present.
Power supply
24 VDC control power, 120/230 VAC input.
Ambient range
0 – 46 °C.
Protection rating
IP54 front.
Relay outputs
Main / star / delta, blowdown, dryer, alarm, remote-run.
Replaces
Power$ync (original)
Used on
- Quincy QGS 5–200
- Quincy QSI-series two-stage rotary screw
- Quincy QSV variable-speed
On AirCompDX
Features
- Native sequencing up to 8 units
- Weekly timer, remote start/stop, dryer control
- Trend log and event history
Interfaces
- Ethernet Modbus TCP
- RS-485 Modbus RTU
- USB service port
Sensor inputs
- Airend discharge temp
- Sump pressure
- Line pressure
- Fluid filter ΔP
- Separator ΔP
Fault code lookup
First checks
- Check fluid level & cooler cleanliness
- Verify thermal valve opens
- Check fan operation
First checks
- Replace separator element
- Change fluid & filter
- Inspect scavenge line orifice
First checks
- Replace air filter
- Inspect inlet valve
First checks
- Reset overload; verify FLA class 20/30
- Check voltage & balance
- Check for airend drag
First checks
- Verify all 3 phases at disconnect
- Inspect contactor & fuses
- Check phase monitor
First checks
- Check unload setpoint & deadband
- Verify inlet valve closes
First checks
- Release E-stop; check remote loop
First checks
- Check wiring; test sensor against reference
First checks
- Perform service; reset only completed timer
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
- 24 VDC control from onboard PSU
- 120 VAC contactor coils typical
Known issues & field notes
- Ethernet port can be flaky on early II units — use RS-485 for sequencing where possible
Field tips (web-sourced)
Distilled from public OEM manuals and community technician references. Cross-check the on-machine service manual before commissioning.
Menu / access
- F1 from the main screen → parameter menu (load/unload setpoints, timers).
- F2 from the main screen → Diagnostic Menu (live pressures, temps, network status).
- 'Network Diagnostic Menu 1' (F2 then next) shows sequencing peers, error count and network average pressure.
Field gotchas
- Two-stage QSD packages report Stage 1 and Stage 2 discharge temps separately — an interstage-cooler fouling shows as high Stage 2 IN temp with normal Stage 1 OUT.
- 'Compressor not ready' at start almost always means the auxiliary contactor (M1a) is not feeding the ready input — check the interlock loop before the controller.
- Power$ync II network runs on RS-485 twisted pair — reversing A/B produces 'Network errors > 0' with no other symptom.
Best public references
Manuals & literature
Quincy Compressor — manuals index
Public literature library
Your manuals
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