High Motor Winding Temperature RTAE

Topic:  High Motor Winding Temperature RTAE

Discussion:

• From Diagnostic List - Any of the compressor's motor winding temperature sensors is seen to be beyond the winding rated temperature of 265°F  (129.4°C).

Solution:

To confirm that there is a faulty motor winding temperature sensor; we recommend you obtain a Chiller Service Report, DataRecorder Files, Default File, Datalog File.  Review the files to confirm temperatures exceed the trip point listed above.  Determine if the issue is just a faulty sensor, two sensors, wiring, connections, or failed compressor.

>  If a failed compressor is confirmed, leading to this diagnostic...replace the compressor.

>  If there are wiring issues, correct the wiring.

>  If there is a sensor issue; reading incorrectly, and ALL of the other sensors are reading correctly, there are options to take:

• Disconnect the failed sensor and place an external 110.0 Ω ½-watt resistor across the Wind Temperature Sensor LLID Input.  You will still have other sensor working; and the resistor will ensure the control system is satisfied.
• Disconnect the faulty sensor and change the following setting in the chiller using TU to 'none'.  While connected to the chiller with Tracer TU, proceed to the Utilities tab, then follow the dropdown menus to Equipment \ Field Startup \ Features Settings Circuit xx.
  • Default setting is Warning
  • Change from Warning  >>>  none
  • Note:  If you DO NOT disconnect the sensor and just change the setting to none...the LLID/Sensor Input will still detect the incorrect Winding Temperature reading, and call out the fault.

Notes:

• High Motor Winding Temperature - RTAE
• High Motor Winding Temperature - Cprsr1A
• High Motor Winding Temperature - Cprsr2A
• There is not a field provided method to physically replace a Winding Temperature Sensor in a GP4 compressor. ( It is physically impossible to embed a new sensor in the motor windings. )