Mitsubishi Electronics IB-1500193(ENG)-D ユーザーズマニュアル

7 - 2

Periodic inspection of the following items is recommended.

[1] Are any of the screws on the terminal block loose? If loose, tighten them.

[2] Is any abnormal noise heard from the servomotor bearings or brake section?

[3] Are any of the cables damaged or cracked? If the cables move with the machine, periodically inspect 

the cables according to the working conditions.

[4] Is the core of the load coupling shaft deviated?

If you continue to use the spindle motor with dirt such as oil mist and dust adhered, its cooling performance 

degrades and the motor is unable to fully exercise its performance, which may cause the spindle motor 

overheat alarm. In some cases this may result in damage to the bearing or cooling fan. To ensure the 

cooling capability of the spindle motor's fan, carry out periodical cleaning of the spindle motor and its cooling 

fan according to the following cleaning procedure.

Note that the spindle motor SJ-VL Series is used as an example in this procedure. When cleaning the other 

spindle motors, carry it out based on this procedure.

1. Before starting maintenance or inspections, turn the main circuit power and control power both 

OFF. Wait at least fifteen minutes for the CHARGE lamp to turn OFF, and then using a tester, 

confirm that the input and output voltage are zero. Failure to observe this could lead to electric 

shocks.

2. Inspections must be carried out by a qualified technician. Failure to observe this could lead to 

electric shocks. Contact your nearest Mitsubishi branch or dealer for repairs and part replacement.

1. Never perform a megger test (measure the insulation resistance) of the servo drive unit. Failure to 

observe this could lead to faults.

2. The user must never disassemble or modify this product.

Do not touch the motor for some time after turning OFF the power, as the motor remains at a high 

temperature. This may lead to burns.