Recording MR-JE-B periodic inspections: cables, dust and abnormal sounds

Keeping inspection records while equipment has no alarms helps later maintenance distinguish newly emerging symptoms. An MR-JE-B checklist should say what was actually inspected, rather than merely “normal” or “dust removed.” Based on section 2.5 of SH-030152ENG-E, this article explains recordkeeping; it does not replace work instructions for qualified maintenance personnel.

Separate observation from maintenance work

The section lists checks including terminal tightness, cable damage, connectors, dust, abnormal sounds and the emergency-stop function. It requires power disconnection, the specified waiting period and confirmation of the charge-indicator state before inspection, with work performed by competent personnel. It also prohibits insulation-resistance testing of the servo amplifier. Experience testing motors must not be applied directly to an amplifier.

What an inspection sheet should contain

• Equipment identification: machine number, axis name, full amplifier model and inspection date.
• Inspection subjects: record cables, connections, cooling passages and external condition separately; one overall tick cannot replace all items.
• Abnormality description: identify its location, extent and the conditions of discovery. For sounds, describe only observations; do not diagnose a failed bearing from the impression of a sound alone.
• Action status: distinguish completed actions, items awaiting shutdown inspection and those requiring specialist testing. Identify the responsible person and follow-up records.

Matching photographs with before-and-after records

Take exterior photographs from the same safely accessible positions each time, using filenames that include the equipment number and date. Photographs of dust, contamination or wear should retain location references, with separate copies before and after cleaning. If electrical inspection is incomplete, a cleaner appearance does not justify marking the relevant items as passed.

If an abnormality persists, consult earlier maintenance records to determine whether the same location has been repeatedly treated. Add the models and dates of replaced parts so that different shifts do not each assume the previous repair resolved it. When records are missing, state that the information is unknown; do not treat verbal speculation as a conclusion.

Handover and restart after inspection

For tightening, disassembly, assembly or functional verification, perform isolation, maintenance and restart under the procedures for the actual equipment. This article provides no method for touching energized connectors, temporary short-circuiting or cleaning during operation. The emergency-stop check must be organized by responsible personnel according to the machine-level plan, considering the mechanical load and site safeguards.

Set inspection frequency according to the actual operating environment and maintenance plan. Do not claim that a monthly inspection covers every operating condition. For repeated cable damage, continue with cable stress and motion-path records; its MR-JE-A requirements must be checked separately against the documentation for the actual machine.

Reference: MR-JE-_B Servo Amplifier Instruction Manual, SH-030152ENG-E, §2.5 Inspection items, printed page 2-6. This article explains applicability and suggests how to organize site information. Perform specific work according to the documentation for the actual equipment and its machine builder.