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Analog Sensors - Troubleshooting Guide - CHC

Service Analog Sensors - Troubleshooting Guide - CHC
Recently Updated Last updated: 04/07/2020

Analog Sensors - Troubleshooting Guide - CHC


Analog Sensors - Troubleshooting Guide - CHC

- Jump to Cause - 1. Analog Input Troubleshooting 2. CHC - Analog Sensor Information 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/Mocon 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 / Mocon PCB.

CHC - Analog Sensor Information

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.

Maincon / Mocon P15

Mills: Alarm 151 LOW THRU-SPINDLE COOLANT

Lathe: Alarm 151 HPC LOW PRESSURE.

AC Voltage
Inside the vector drive (the sensor is not serviceable).
Maincon / Mocon P17 Alarm 160 LOW INCOMING LINE VOLTAGE
HPU Low Hydraulic Pressure
On the hydraulic power unit.
Maincon / Mocon P19
Alarm 134 LOW HYDRAULIC PRESSURE
Lathe: X-axis temperature sensor.
On the X-axis ballscrew ballnut.
Maincon / Mocon P21 N/A
Coolant Level
On the coolant level float.
Maincon / Mocon P22
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.
AC Line Voltage
On the power-fail-detect-module (the sensor is not serviceable).
Maincon / Mocon P26
Alarm 937 INPUT LINE POWER FAULT

Horizontal: Y-axis temperature sensor.

Lathe: HPU Pressure

Horizontal: On the Y-axis column.

Lathe: On the hydraulic power unit.

Maincon / Mocon P27

Horizontal: N/A

Lathe: Alarm 2091 HPU OIL TEMPERATURE TOO HIGH

Spindle Motor Temperature
On the spindle motor .
Maincon / Mocon P28
Alarm 254 SPINDLE MOTOR OVERHEAT
Air Pressure
On the air-lube cabinet
Maincon / Mocon P37
Alarm 120 LOW AIR PRESSURE
Electronics Temperature

On the Maincon / Mocon (the sensor is not serviceable).
-
Alarm 253 ELECTRONICS OVERHEAT
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