Atlas Copco Tensor S Tightening Tool Troubleshooting Guide

Fault 2: Abnormal tool overheating

Overheating does not necessarily indicate motor damage, it is usually caused by improper combination of multiple parameters. The document lists the following triggering factors:

The torque setting exceeds the rated value;

Low rotational speed leads to an increase in current at the same power;

The slope time is too long (the motor outputs high torque for a long time);

Extremely high 'current torque' (high thread friction resistance);

The joint has just become soft (continuous work under long stroke);

The cycle time is too short (insufficient heat dissipation).

Processing strategy:

Adjust parameters: increase the speed appropriately, shorten the ramp time, and switch to the "single-stage tightening" or "Ergoamp" strategy (these two methods generate the least heat).

If the adjustment is ineffective, upgrade to a tool with a larger capacity (such as S4 → S7).

Check the actual tightening curve to confirm if there is an abnormal increase in torque due to batch changes.

Fault 3: Torque measurement deviation or abnormal indicator light

The tool comes with a three color signal light (green=qualified, yellow=low torque alarm, red=high torque alarm). If yellow/red frequently appears and the torque is actually qualified, the possible reasons may be:

The calibration value in the tool memory has been accidentally modified - check if someone has mistakenly changed the parameters while the POWER FOCUS is connected (the changes will be automatically stored in the tool EEPROM).

Poor contact of sensor bridge or cable - check if the 19 pin cable connector is loose (there should be no axial or radial movement after connection).

External interference (such as strong magnetic fields in welding equipment) - Ensure that tools are kept away from high noise sources such as arc welding.

Mandatory Electrical Safety and Grounding Inspection

4.1 Dual protection mechanism

Passive protection: The entire machine is grounded (including fixed fixtures that require an additional 2.5mm ² wire to be connected back to the driver).

Active protection: EFP. The document emphasizes that any changes or tampering with the protection system will result in the warranty being invalidated.

4.2 Monthly Inspection Checklist

Press the test button on the EFP to immediately trip and power off.

Use a multimeter to measure the resistance between the metal casing of the tool and the main grounding point, which should be close to 0 Ω (with good continuity).

Check the outer sheath of the tool cable for damage, wear, or compression, especially paying attention to whether the plastic long pin at the plug is intact (this pin is used to prevent accidental insertion).

Software and Data Management (Reducing Human Errors)

The wonderful use of built-in memory: When the tool is connected to POWER FOCUS, the torque calibration value (mV/V), angle pulse number, full-scale percentage, serial number, latest calibration date, etc. are all automatically loaded. This avoids the common numerical misalignment or unit confusion in traditional manual input. The actual value on the calibration certificate takes precedence over the nominal value on the nameplate - if replacing the measuring instrument, be sure to read the original data from the tool label or memory.

Verification after firmware/configuration changes: The "Notice" section at the beginning of the document emphasizes that torque must be revalidated (at least once per shift) after changing tool batches, software versions, gas/electrical connections, operators, or any events that may affect tightening results. This is the basic requirement of standards such as ISO/TS 16949 and the key to avoiding batch quality accidents.

Long term disuse and environmental disposal

If it has been inactive for more than a month, it is recommended to power on and run a low-frequency test to drive moisture.

When scrapped, the WEEE Directive (2012/19/EU) must be followed, and the product body and battery must be labeled with the symbol "forked trash can". In the European Union, unclassified municipal waste shall not be mixed in, and shall be sent to the designated recycling point or returned to Atlas Copco customer center. Batteries must be transferred separately according to the requirements of the national battery recycling organization.

On site emergency response: "Three musts and three don'ts"

Do not do

Test EFP monthly without resetting EFP with faults

Use specialized maintenance tools to disassemble and do not open the motor seal without authorization

Do not add excessive or insufficient lubricating grease during 250k or 1-year regular major repairs

Record each calibration/maintenance date and do not use non original spare parts

Check the cable connector locking and do not open the cover for maintenance in damp or dusty environments

Quick Reference Table for Troubleshooting

The primary inspection items for phenomena are to be checked, followed by the final measures

Do not activate POWER FOCUS mode, check if the fuse EFP trips and reset after eliminating leakage

Whether the actual torque of overheating speed, ramp time, and cycle time exceeds the rated adjustment parameters or whether the tool needs to be upgraded by one level