Nitto Kohki DLV30A Instruction Manual

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Nitto Kohki DLV30A Instruction Manual Manual pdf 15 page image

13EN7 AppendixTroubleshootingSymptoms Location to investigate SolutionThe electric screwdriverdoes not operateIs the power plug inserted into anoutlet?Is power supplied to the outlet?Properly insert the power plug into the outlet.Check the power supply.Is the changeover switch set toneutral? Slide the changeover switch to the R or L side.The output torque is lowScrews cannot betightenedAre you using a combination ofNitto Kohki measuring devices formeasurement?Use a combination of Nitto Kohki's measuringdevices for measurement. (p. 4)Are you turning the torque adjustmentring clockwise?Has the output torque dropped?The output torque decreases as the tool is used.Turn the torque adjustment ring clockwise. (p. 12)Did you check the correlation betweenthe output torque occurred on screwsand the output torque measured usinga measurement device?The output torque occurred on screws and theoutput torque measured by the measurement deviceare different.Adjust the output torque according to the screwfastening conditions. (p. 4)Is the bit worn out?When the bit is worn out, it becomes difficult totransmit torque to screws.Replace the bit. (p. 6)Are you tightening while crushing apart between the screws.Has regression loosening occurred?Torque may not be transmitted. Crush the part onceand then tighten the screw.Has axial force occurred to the screw?Without axial force, even though the output torqueis increased, screws are not tightened. Review thescrew fastening conditions.Also, by tightening at low speed, it becomes easierto transmit torque.Has initial loosening occurred?Initial loosening occurs as a result of permanent setin fatigue when fine irregularities such as surfaceroughness are lost over time after the screw istightened or outside force is applied. Tighten thescrew again.Has the permanent set in fatigueoccurred due to permanentdeformation of sealing material suchas the gasket?Carefully check the screw fastening conditions andset the output torque.Depending on the material, torque may not betransmitted.Is the area surrounding the screw at ahigh temperature?Screws could be extended or loosened bytemperature changes.Review the screw fastening conditions and process.Have you considered the occurrenceof vibration or outside force?Loosening of screw occurs if no measures are takenfor vibration or outside force.Take appropriate loosening prevention measures.The output torque is highScrews are tightenedtoo muchDid you check the correlation betweenthe output torque occurred on screwsand the output torque measured usinga measurement device?The output torque occurred on screws and theoutput torque measured by the measurement deviceare different.Adjust the output torque according to the screwfastening conditions. (p. 4)Have you attached a heavy jig or a jighaving a large radius at the end?After the torque reaches the set torque, the inertialforce of the jig might have been transmitted toscrews.Review the jig and reduce the weight or size of thejig.The torque scale andoutput torque do notmatchThe torque scale is a standard. The output torque range is not guaranteed.The output torque range sometimes differs from the scale but this is not a product error.(p. 5)