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Analog Sensors - Troubleshooting Guide - NGC

Service Analog Sensors - Troubleshooting Guide - NGC
Recently Updated Last updated: 03/30/2021

Analog Sensors - Troubleshooting Guide - NGC


Analog Sensors - Troubleshooting Guide - NGC

- Jump to Cause - Back to Top

Analog Input Troubleshooting

A Haas machine, depending on the vintage, has anywhere between one and eight analog sensors in various systems throughout the machine. All of these sensors share a common ground. A problem with one of these sensors could potentially affect the signal from all of them, making troubleshooting difficult. If you are troubleshooting a problem with any of these sensors, their cables or the Maincon/ I/O PCB follow these simple steps:

  1. Look at the gauge page and identify the readings that look unreasonable. For example, if the spindle motor temperature [1] reads 0-degrees Fahrenheit and the shop is at 77-degrees this is not reasonable.
  2. If one of these cables or sensors has a short-circuit. The gauge display will show several readings that are not reasonable.
  3. Unplug each analog sensor one at a time. Look for the other gauge readings to return to something reasonable.

     Note: Some signals may take up to 30 seconds to react.

  4. When you find the sensor that is causing the inaccurate readings you have most likely found the problem. Check the cable for damage. Check the sensor.

     Note: The cable or the sensor are more likely to be the cause of the problem than the Maincon / I/O PCB.

Symptom Table

Symptom Possible Cause Corrective Action
Alarm 9916 EXCESSIVE THERMAL COMPENSATION DISTANCE There is electrical noise on the signal or the thermal sensor is faulty. Check the thermal sensor input in diagnostics and see if the signal is fluctuating.  If signal is fluctuating,  inspect the amplifiers and make sure there is a ferrite bead on ALL axis power cables. Check for loose connection or damage to the thermal sensor cable.  If all checks have been done the thermal sensor is faulty.
Alarm 9940 AXIS THERMAL SENSOR FAULT There is electrical noise on the signal or the thermal sensor is faulty. Check the thermal sensor input in diagnostics and see if the signal is fluctuating.  If signal is fluctuating,  inspect the amplifiers and make sure there is a ferrite bead on ALL axis power cables. Check for loose connection or damage to the thermal sensor cable.  If all checks have been done the thermal sensor is faulty.
The cable or sensor is disconnected. Check for loose connection or damage to the thermal sensor cable. 

At Power On:

Alarm 4.9940 AXIS THERMAL SENSOR FAULT

Is generated.

The I/O Main Firmware is outdated. Make sure the I/O Main Firmware is version 4.09 or higher.  Refer to the I/O Firmware Upgrade procedure.

After software update machine generates 

Alarm 4.9916 / 9916 EXCESSIVE THERMAL COMPENSATION DISTANCE

OR

4.9940 / 9940 AXIS THERMAL SENSOR FAULT

Invalid I/O configuration files. Make sure that the thermal sensor is mapped to the correct I/O analog input.
This applies to UMC machines:  Axis thermal sensor cable is plugged into the wrong analog input. Make sure the axis thermal sensor cable is plugged into P45 on the I/O PCB.
There is electrical noise on the signal or the thermal sensor is faulty. Check the thermal sensor input in diagnostics and see if the signal is fluctuating.  If signal is fluctuating,  inspect the amplifiers and make sure there is a ferrite bead on ALL axis power cables. Check for loose connection or damage to the thermal sensor cable.  If all checks have been done the thermal sensor is faulty.

NGC - Analog Sensor Information

Note: The connector location of these sensors can change,  please check the location on the screen.  Press [DIAGNOSTIC] and go to the I/O tab and search for keyword "ANALOG" and press [F1].

The raw data analog sensors that are connected to the Maincon PCB, can be view under the Mocon tab.

Gauge Name / Analog Sensor
Analog Sensor Location
Analog Sensor Connector Location*
Alarm / Warning

Mills: TSC Pressure

Lathe: HPC Pressure

Mills: On the TSC pump.

Lathe: On the HPC pump.

I/O PCB P39.21

Mills: Alarm 151 LOW THRU-SPINDLE COOLANT

Lathe: Alarm 8151 HPC LOW PRESSURE.

EC-1600: Y-axis temperature sensor. On the Y-axis column. I/O PCB P39.19 N/A
Lathe: X-axis temperature sensor.
On the X-axis ballscrew ballnut.
I/O PCB P2.14 N/A
Coolant Level
On the coolant level float.
I/O PCB P43.1 Low coolant Icon will apper when the coolant level is low.  The Low Coolant Concentrate icon will appear when machine is equipped with the Coolant Refill option.
Coolant Temperature On the coolant filter. I/O PCB P44.1 This temperature is for display purposes only and is shown on the gauge tab if the hardware is installed and enabled.
HPU Low Hydraulic Pressure On the hydraulic power unit. I/O PCB P48.7 Alarm 8134 LOW HYDRAULIC PRESSURE ON START
Note: UMC's that are equipped with Hydraulic Brakes for the B and C-axis can generate this alarm after a software upgrade if the hydraulic analog pressure sensor input is not mapped correctly.  Make sure the IO Configuration file has the correct mapping.
HPU Oil Temperature
On the hydraulic power unit.
I/O PCB P46.1

Alarm 2096 HPU OIL TEMPERATURE TOO HIGH

Spindle Temperature On the spindle head. I/O PCB P39.24 This temperature is for display purposes only and is shown on the gauge tab if the hardware is installed and enabled.
Spindle Motor Temperature
On the spindle motor .
I/O PCB P39.22 Alarm 254 SPINDLE MOTOR OVERHEAT
Analog Air Pressure
On the air-lube cabinet.
I/O PCB P34.5 Alarm 120 LOW AIR PRESSURE
Ambient Temperature On the base casting. I/O PCB P51.1 This temperature is for display purposes only and is shown on the gauge tab if the hardware is installed and enabled.
DC Voltage
Inside the vector drive (the sensor is not serviceable).
Maincon PCB J16 Alarm 160 LOW INCOMING LINE VOLTAGE
AC Line Voltage
On the power-fail-detect-module (the sensor is not serviceable).
Maincon PCB J3 Alarm 937 INPUT LINE POWER FAULT
Electronics Temperature

On the Maincon PCB (the sensor is not serviceable).
N/A Alarm 253 ELECTRONICS OVERHEAT
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