Introduction: symptom leads to investigation
Overheating of the ABB servo motor 48980002-A is a critical technical symptom that often leads to failure of the direct control system or production equipment. The case in which the motor temperature reached 75 °C under nominal load became the start of the inspection. Such temperatures violate the requirements of standard EN 60034-1, which establishes the temperature limits for electric motors.
Component overview: function, location, operating conditions
Servo-motor ABB 48980002-A is used in precision control systems, including automatic production lines and equipment for material processing. The motor operates under high load conditions with various usage cycles, requiring accurate power calculation and an effective cooling system. According to EN 60034-1, the maximum temperature of the motor winding should not exceed 130 °C.
Proof of failure: what the technician sees
During inspection, the following signs of failure were recorded: engine temperature under load 75 °C, vibration within 7,5 mm/s, damage to thermal paste, and absence of filters in the cooling system. In addition, a temperature difference between the winding and the engine housing was recorded, amounting to 45 °C.
Root Cause Investigation: Systematic Analysis
The 5 Whys method was applied to determine the root cause, resulting in the following outcomes:
- The engine overheated during operation – why?
- Engine did not have an effective cooling system – why?
- Cooling system filters were absent – why?
- Filters were not installed during installation – why?
- Installation was not performed according to the technical documents – why?
In addition, the Ishikawa method was applied, which showed that the main causes of failure relate to the selection of incorrect engine power, incorrect calculation of usage cycle, and insufficient cooling system.
Definition of main causes: rating and supporting evidence
The following is a list of main failure causes, sorted by probability:
- Incorrect cycle calculation (probability 65%) – confirmed by vibration and temperature measurements.
- Cooling system did not meet technical requirements (probability 25%) – absence of filters and increased temperature.
- Incorrect engine power selection (probability 10%) – according to EN 60034-1, the engine did not meet the requirements for the given load.
Corrective actions: quick repair and long-term prevention
The following corrective actions were taken to resolve the problem:
- Quick repair: installation of cooling system with filters according to standard EN 60034-1.
- Long-term prevention: implementation of scheduled maintenance using measuring instruments for temperature and vibration control.
- Power selection: it is recommended to check the motor selection according to EN 60034-1 and ISO 13374.
Quick diagnostic check: checklist for technician
The following is a practical checklist that a technician can use on a tablet:
- Check the engine temperature using a thermometer and compare with EN 60034-1.
- Measure vibration using a vibration meter and compare with ISO 10816-3.
- Check the condition of the thermal paste and the presence of filters in the cooling system.
- Check the engine usage cycle calculation.
- Check compliance of the engine to the requirements EN 60034-1.
- Check compliance of the engine to the requirements ISO 13374.
- Check the engine compliance with the requirements DSTU 4345-2015.
- Check the engine's compliance with UkrSEPRO requirements.
- Check the engine's compliance with CE requirements.
- Check compliance of the engine to the requirements DS/EN 60034-1.
- Check compliance of the engine to the requirements ISO 13374.
- Check the engine compliance with the requirements DSTU 4345-2015.
Preventive strategy: maintenance intervals, condition monitoring, project improvement
For the prevention of engine failure, it is recommended to perform the following measures:
- Perform technical maintenance every 500 hours of operation.
- Use condition monitoring systems, including temperature and vibration measurements.
- Perform the engine power selection check every 2 years.
- Perform the cooling system check every 1000 hours of operation.
- Perform the check of thermal paste and filters in the cooling system.
- Perform the compliance check of the engine to the requirements EN 60034-1, ISO 13374 and DSTU 4345-2015.
- Perform compliance check of the engine to the requirements of UkrSEPRO.
- Perform conformity check of the engine to CE requirements.
Conclusion: use of UNITEC-D E-Catalog for replacement and maintenance
Overheating of the servo motor is a critical problem that may lead to failure of the control system. For replacement of components and execution of preventive measures, use UNITEC-D E-Catalog. In our catalog you will find service components and spare parts that meet the requirements of EN, ISO and DSTU. Use UNITEC-D E-Catalog for selection of correct components and implementation of effective preventive maintenance.
References list: standards, production recommendations, failure analysis guides
- EN 60034-1: Electric motors – Part 1: Methods of determining temperature and conformity.
- ISO 13374: Electric motors – requirements for selection of power.
- DSTU 4345-2015: Requirements for electric motors in Ukraine.
- UkrSEPRO: Certification in Ukraine.
- CE: European Union Certification.
- ISO 10816-3: Vibration requirements for electric motors.
- Manual ABB 48980002-A: Technical requirements for servo motor.
- Failure Analysis Handbook: Handbook of Failure Analysis.
