Table 1　to Table 5　give information about the recommended periodic inspections for Yaskawa drives. Examine the drive one time each year at a minimum. The operating conditions, environmental conditions, and use conditions will have an effect on the examination frequency for connected equipment. You must use your experience with the application to select the correct inspection frequency for each drive installation. Periodic inspections will help to prevent performance deterioration and product failure. Make a copy of this checklist and put a check mark in the “Checked” column after each inspection.

Table 1. Main Circuit Periodic Inspection Checklist

Inspection Area

Inspection Points

Corrective Action

Checked

General

  • Examine equipment for discoloration from too much heat or deterioration.

  • Examine for damaged parts.

  • Replace damaged components as necessary.

  • The drive does not have many serviceable parts and it could be necessary to replace the drive.

  

Examine for dirt, unwanted particles, or dust on components.

  • Examine enclosure door seal.

  • Use a vacuum cleaner to remove unwanted particles and dust without touching the components.

  • If you cannot remove unwanted particles and dust with a vacuum cleaner, replace the components.

  

Conductors and Wiring

  • Examine wiring and connections for discoloration or damage. Examine wiring and connections for discoloration from too much heat.

  • Examine wire insulation and shielding for discoloration and wear.

Repair or replace damaged wiring.

  

Terminal Block

Examine terminals for stripped, damaged, or loose connections.

  • Tighten loose screws.

  • Replace damaged screws or terminals.

Note:

On drive models, 2056, 2070, 4031, and 4038, you cannot replace the hex screws.

  

Electromagnetic Contactors and Relays

  • Examine contactors and relays for too much noise during operation.

  • Examine coils for signs of too much heat, such as melted or broken insulation.

  • Check coil voltage for overvoltage or undervoltage conditions.

  • Replace broken relays, contactors, or circuit boards that you can remove.

  

Dynamic Braking Option

Examine the insulation for discoloration from too much heat.

If there is discoloration in the option, check to make sure that the wiring is not damaged. A small quantity of discoloration is not a problem.

  

Electrolytic Capacitor

  • Examine for leaks, discoloration, or cracks.

  • Examine if the cap has come off, if there is swelling, or if there are leaks from broken sides.

The drive does not have many serviceable parts and it could be necessary to replace the drive.

  

Diodes, IGBT (Power Transistor)

Examine for dust or other unwanted material collected on the surface.

Use a vacuum cleaner to remove unwanted particles and dust without touching the components.

  
Table 2. Motor Periodic Inspection Checklist

Inspection Area

Inspection Points

Corrective Action

Checked

Operation Check

Check for increased vibration or unusual noise.

Stop the motor and contact approved maintenance personnel as necessary.

  
Table 3. Control Circuit Periodic Inspection Checklist

Inspection Area

Inspection Points

Corrective Action

Checked

General

  • Examine terminals for stripped, damaged, or loose connections.

  • Make sure that all terminals have been correctly tightened.

  • Tighten loose screws.

  • Replace damaged screws or terminals.

  • If terminals are integral to a circuit board, it could be necessary to replace the control board or the drive.

  

Circuit Boards

  • Check for odor, discoloration, or rust.

  • Make sure that all connections are correctly fastened.

  • Make sure that the surface of the circuit board does not have dust or oil mist.

  • Tighten loose connections.

  • Use a vacuum cleaner to remove unwanted particles and dust without touching the components.

  • If you cannot remove unwanted particles and dust with a vacuum cleaner, replace the components.

  • Do not use solvents to clean the board.

  • The drive does not have many serviceable parts and it could be necessary to replace the drive.

  
Table 4. Cooling System Periodic Inspection Checklist

Inspection Area

Inspection Points

Corrective Action

Checked

Cooling fan

  • Check for unusual oscillation or unusual noise.

  • Check for damaged or missing fan blades.

Clean or replace the fans as necessary.

  

Heatsink

  • Examine for dust or other unwanted material collected on the surface.

  • Examine for dirt.

Use a vacuum cleaner to remove unwanted particles and dust without touching the components.

  

Air Duct

Examine air intake, exhaust openings and make sure that there are no unwanted materials on the surface.

Clear blockages and clean air duct as necessary.

  
Table 5. Keypad Periodic Inspection Checklist

Inspection Area

Inspection Points

Corrective Action

Checked

General

  • Make sure that the keypad shows the data correctly.

  • Examine for dust or other unwanted material that collected on components in the area.

  • If you have problems with the display or the keys, contact Yaskawa or your nearest sales representative.

  • Clean the keypad.