Yaskawa VS-626 MC5 - Manual (Page 261)

10.1 Maintenance and Inspection
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10.1 Maintenance and Inspection
The maintenance period of the Inverter is as follows:
Maintenance Period: Within 18 months of shipping from the factory or within 12 months of being delivered to
the final user, whichever comes first.
10.1.1 Daily Inspection
Check the following items with the system in operation.
D The motor should not be vibrating or making unusual noises.
D There should be no abnormal heat generation.
D The ambient temperature should not be too high.
D The output current value shown on the monitor display should not be higher than normal.
D The cooling fan on the bottom of the Inverter should be operating normally.
10.1.2 Periodic Inspection
Check the following items during periodic maintenance.
Always turn OFF the power supply before beginning inspection. Confirm that the LED indicators on the
front cover have all turned OFF, and then wait until at least one minute (or at least three minutes for Inverters
of 30 kW or more) has elapsed before beginning the inspection. Be sure not to touch terminals right after the
power has been turned off. Doing so can result in electric shock.
Table
10.1 Periodic Inspections
Item Inspection Corrective Procedure
External terminals,
mounting bolts con Are all screws and bolts tight? Tighten loose screws and bolts firmly.
mounting bolts, con-
nectors, etc.
Are connectors tight? Reconnect the loose connectors.
Cooling fins Are the fins dirty or dusty?
Clean off any dirt and dust with an air
gun using dry air at a pressure of
39.2 10
4 to 58.8 10 4 Pa (4 to 6
kg cm 2 ).
PCBs
Is there any conductive dirt or oil mist on
the PCBs?
Clean off any dirt and dust with an air
gun using dry air at a pressure of
39.2 10
4 to 58.8 10 4 Pa (4 to 6
kg cm 2 ).
Replace the boards if they cannot be
made clean.
Cooling fan
Is there any abnormal noise or vibration
or has the total operating time exceeded
20,000 hours?
Replace the cooling fan.
Power elements
Is there any conductive dirt or oil mist on
the elements?
Clean off any dirt and dust with an air
gun using dry air at a pressure of
39.2 10
4 to 58.8 10 4 Pa (4 to 6
kg cm 2 ).
Smoothing capacitor
Are there any irregularities, such as dis-
coloration or odor?
Replace the capacitor or Inverter.
10.1.3 Periodic Maintenance of Parts
The Inverter is configured of many parts, and these parts must be operating properly in order to make full
use of the Inverter functions.
Among the electronic components, there are some that require maintenance depending on their usage condi-
tions. In order to keep the Inverter operating normally over a long period of time, it is necessary to perform
period inspections and replace parts according to their service life.
Periodic inspection standards vary depending the Inverter’s installation environment and usage conditions.
The Inverter’s maintenance periods are noted below. Keep them as reference.
Table
10.2 Part Replacement Guidelines
Part Standard Replacement Period Replacement Method
Cooling fan 2 to 3 years Replace with new part.
Smoothing capacitor 5 years
Replace with new part. (Determine need by
inspection.)
Breaker relays  Determine need by inspection.
Fuses 10 years Replace with new part.
Aluminum capacitors on
PCBs
5 years
Replace with new board. (Determine need
by inspection.)
Note Usage conditions are as follows:
Ambient temperature: Yearly average of 30 qC
Load factor: 80% max.
Operating rate: 12 hours max. per day
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