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5
MAINTENANCE, INSPECTION AND PARTS
REPLACEMENT
5.1
Inspection items
Precautions
• Do not disassemble, repair, or modify the product.
• For repair and parts replacement, contact your local sales office.
• To prevent a malfunction, do not perform an insulation resistance test (megger test) on the drive unit.
Periodic inspection
Perform the following inspections.
• Check for loose terminal block screws. Retighten any loose screws.
• Check the cables and the like for scratches or cracks. Inspect them periodically according to operating conditions
especially when the servo motor is movable.
• Check that the connector is securely connected to the drive unit.
• Check that the wires are not coming out from the connector.
• Check for dust accumulation on the drive unit.
• Check for unusual noise generated from the drive unit.
• Make sure that the emergency stop circuit operates properly such that an operation can be stopped immediately and a
power is shut off by the emergency stop switch.
5.2
Parts with a service life
The service life of the following parts is listed below. In addition, the service life varies depending on the operating methods
and environment. If any fault is found in a part, it is necessary to replace it immediately regardless of its service life. For parts
replacement, please contact your local sales office.
Part name
Relay
Cooling fan
Relays
A relay will reach the end of its service life if the following actions are performed a total of 100,000 times: powering on the
drive unit, inputting the dynamic brake stop, and inputting the forced stop. In addition, the service life of a relay may vary
depending on the power supply capacity.
Drive unit cooling fan
The cooling fan bearings will reach the end of their service life in 50,000 hours to 70,000 hours. Therefore, the cooling fan
must be replaced after seven to eight years of continuous operation as a guideline. If unusual noise or vibration is found
during inspection, the cooling fan must also be replaced. The service life has been calculated in an environment which
contains no corrosive gas, flammable gas, oil mist, or dust. The average annual ambient temperature was 40 ˚C.
Recommended service life
Total number of power-ons, stops by a dynamic brake, and forced stops:
100,000 times
50,000 hours to 70,000 hours (7 to 8 years)
5 MAINTENANCE, INSPECTION AND PARTS REPLACEMENT
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5.1 Inspection items
5
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