Yaskawa RC5 Converter - Manual (Page 47)

5.2 Periodic Inspection and Maintenance
YASKAWA ELECTRIC TOEP C710656 01C YASKAWA - RC5 Instruction Manual 47
5.2 Periodic Inspection and Maintenance
The maintenance period of the power regenerative unit 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.
◆ Daily Inspection
Check the following items with the system in operation.
• There should be no abnormal heat generation.
• The ambient temperature should not be too high.
• The cooling fan on the power regenerative unit should be operating normally.
◆ 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 at least five minutes have elapsed before beginning the inspection. Be sure not to touch terminals right after the power has been turned OFF.
Doing so can result in an electric shock.
Table 5.1 Periodic Inspections
<1> Unit power must be ON to perform this check.
◆ Periodic Maintenance of Parts
The power regenerative unit is configured of many parts, and these parts must be operating properly in order to make full use of its functionality.
Among the electronic components, there are some that require maintenance depending on their usage conditions. In order to keep the power
regenerative unit operating normally over a long period of time, it is necessary to perform period inspections and replace parts according to their
service life.
When replacing parts, be careful not to drop any, such as screws, inside the RC5. Failure to observe this caution may result in a short-circuit and a
fire.
Periodic inspection standards vary depending the installation environment and usage conditions of the power regenerative unit. The power
regenerative unit’s maintenance periods are noted below. Keep them as reference.
Table 5.2 Part Replacement Guidelines
Note: Usage conditions are as follows: • Ambient temperature: Yearly average of 30°C • Load factor: 80% max. • Operating rate: 12 hours max. per day.
Item Inspection Corrective Procedure
External terminals, mounting
bolts, connectors, etc. Are all screws and bolts tight? Tighten loose screws and bolts firmly.
Are connectors tight? Reconnect the loose connectors.
Heatsink Are the fins dirty?
Clean off any dirt and dust with an air gun using dry air at a
pressure of 39.2x10
4 to 58.8x10 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 39.2x10
4 to 58.8x10 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? <1>
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 39.2x10
4 to 58.8x10 4 Pa (4 to 6 kg•cm 2 ).
Smoothing capacitor Are there any irregularities, such as discoloration or odor? Replace the capacitor or power regenerative unit.
Part Standard Replacement Period Replacement Method
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.)