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11. Inspection
11 - 2
WARNING
1. Turn the main circuit power and control power both OFF before starting
maintenance and inspection. It will take approx. 10 minutes for the main
circuit's capacitor to discharge. After the CHARGE LAMP goes out, use a
tester to confirm that the input and output voltages 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 the Service Center for repairs and
part replacements.
CAUTION
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.
11-1 Inspections
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?
11-2 Service parts
A guide to the part replacement cycle is shown below. Note that these will differ according to the working
conditions or environmental conditions, so replace the parts if any abnormality is found. Contact
Mitsubishi branch or your dealer for repairs or part replacements.
Part name Standard replacement time Remarks
Smoothing capacitor 10 years
Cooling fan
10,000 to 30,000 hours
(2 to 3 years)
Servo drive unit
Battery 10,000 hours
Bearings 20,000 to 30,000 hours
Detector 20,000 to 30,000 hours
Servomotor
Oil seal, V-ring 5,000 hours
The standard replacement time
is a reference. Even if the
standard replacement time is
not reached, the part must be
replaced if any abnormality is
found.
<1> Power smoothing capacitor : The characteristics of the power smoothing capacitor will deteriorate
due to the effect of ripple currents, etc. The capacitor life is greatly
affected by the ambient temperature and working conditions.
However, when used continuously in a normal air-conditioned
environment, the service life will be ten years.
<2> Relays : Contact faults will occur due to contact wear caused by the switching
current. The service life will be reached after 100,000 cumulative
switches (switching life).
<3> Servomotor bearings : The motor bearings should be replaced after 20,000 to 30,000 hours
of rated load operation at the rated speed. This will be affected by the
operation state, but the bearings must be replaced when any
abnormal noise or vibration is found in the inspections.
<4> Motor oil seal, V-ring : These parts should be replaced after 5,000 hours of operation at the
rated speed. This will be affected by the operation state, but these
parts must be replaced if oil leaks, etc., are found in the inspections.