VSD Comm Loss — Xe-90M Fault Code

Xe-90M

The 90M is the usual retrofit target when replacing an obsolete Intellisys SG on an R-Series — sensors change but the panel cutout is close.

Manufacturer

Ingersoll Rand

Display

3.5" backlit graphic LCD with soft keys and status LED bar.

Years produced

~2014 – present. Mid tier of the Xe family.

Power supply

24 VDC from package transformer; battery-backed clock.

Ambient range

0 – 46 °C.

Protection rating

IP54 front.

Relay outputs

Main/star/delta, load, blowdown, dryer enable, common alarm, remote-run, spare programmable relay.

Replaces

Intellisys SG, Xe-70M (on larger frames)

Used on

IR R-Series 37–75 kW fixed speed
Sierra oil-free (select frames)
UP6-Series larger packages

Features

Integrated sequencing of up to 4 compressors without an external master
Energy-saving 'Progressive Adaptive Control' — reduces unloaded run time automatically
Full alarm and event history with hour-stamped entries
Dual pressure setpoint with schedule

Interfaces

Modbus RTU (RS-485)
Ethernet Modbus TCP (option)
Volt-free contacts
X-Series sequencing link

Sensor inputs

Package discharge pressure
Sump pressure
Airend discharge temp (RTD)
Inlet vacuum (option)
Separator ΔP
Coolant filter ΔP

Fault code lookup

Hi Airend Discharge Temp Airend temperature above shutdown.

First checks

Coolant level
Cooler core / aftercooler fouling
Thermal valve element

See trigger conditions & affected models →

Hi Package Discharge Pressure Line pressure over the shutdown limit.

First checks

Inlet valve not closing on unload
Blowdown solenoid failed closed
Check MPV / check valve

See trigger conditions & affected models →

Change Coolant Filter Filter ΔP over threshold.

First checks

Change filter, reset the timer
Cold-start ΔP alarms are normal until fluid warms

See trigger conditions & affected models →

Remote Start Failure Remote start signal present but unit could not sequence.

First checks

Confirm control mode is set to Remote
Check the remote loop contact stays closed long enough
Look for a standing alarm blocking start

See trigger conditions & affected models →

Low Unload Pressure Sump pressure did not build after start.

First checks

Inlet valve stuck closed
Blowdown valve leaking
Verify sump transducer against gauge

See trigger conditions & affected models →

Starter Fault / 1SL Fail Contactor auxiliary feedback missing.

First checks

Check contactor aux contact and wiring
Look for welded or chattering contactor
Verify 24 V coil supply

See trigger conditions & affected models →

VSD Comm Loss On VSD packages, drive stopped answering.

First checks

Drive powered and not in fault
RS-485 A/B polarity and termination
Check drive parameter for control source

See trigger conditions & affected models →

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

Sequencing between Xe controllers is RS-485 daisy-chained — no star topology, 120 Ω at both physical ends
Keep transducer runs out of the starter compartment; VFD carrier noise shows as jittery pressure

Known issues & field notes

Display ribbon connector backs out with panel vibration — reseat before condemning the CPU
Firmware before 2017 mis-handles daylight-saving on scheduled start/stop

Service level is distributor-set. Operator-level parameter access needs no code on most builds.

Manuals & literature

Ingersoll Rand — support portal

Customer Care → Manuals & Parts (login often required)

Direct PDFs

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