YASKAWA GA800 Technical Reference page 429

DANGER! Electrical Shock Hazard. Do not examine, connect, or disconnect wiring on an energized drive. Before servicing,
disconnect all power to the equipment and wait for the time specified on the warning label at a minimum. The internal capacitor
stays charged after the drive is de-energized. The charge indicator LED extinguishes when the DC bus voltage decreases below 50
Vdc. When all indicators are OFF, remove the covers before measuring for dangerous voltages to make sure that the drive is safe. If
you do work on the drive when it is energized, it will cause serious injury or death from electrical shock.
Inspection Area
• Examine equipment for discoloration from too
much heat or deterioration.
• Examine for damaged parts.
General
Examine for dirt, unwanted particles, or dust on
components.
• Examine wiring and connections for discoloration
or damage. Examine wiring and connections for
Conductors and
discoloration from too much heat.
Wiring
• Examine wire insulation and shielding for
discoloration and wear.
Examine terminals for stripped, damaged, or loose
Terminal Block
connections.
• Examine contactors and relays for too much noise
Electromagnetic
during operation.
Contactors and
• Examine coils for signs of too much heat, such as
Relays
melted or broken insulation.
Dynamic Braking Examine the insulation for discoloration from too
Option much heat.
• Examine for leaks, discoloration, or cracks.
Electrolytic Capacitor
• Examine if the cap has come off, if there is
swelling, or if there are leaks from broken sides.
Diodes, IGBT (Power Examine for dust or other unwanted material collected
Transistor) on the surface.
Inspection Area
Operation Check Check for increased vibration or unusual noise.
Inspection Area
• Examine terminals for stripped, damaged, or loose
connections.
General
• Make sure that all terminals have been correctly
tightened.
• Check for odor, discoloration, or rust.
• Make sure that all connections are correctly
Circuit Boards fastened.
• Make sure that the surface of the circuit board does
not have dust or oil mist.
Inspection Area
• Check for unusual oscillation or unusual noise.
Cooling fan
• Check for damaged or missing fan blades.
• Examine for dust or other unwanted material
collected on the surface.
Heatsink
• Examine for dirt.
Examine air intake, exhaust openings and make sure
Air Duct
that there are no unwanted materials on the surface.
YASKAWA SIEPC71061737D GA800 Drive Technical Reference
Table 8.2 Main Circuit Periodic Inspection Checklist
Inspection Points
• Replace damaged components as necessary.
• The drive does not have many serviceable parts and it could be necessary to
• Examine enclosure door seal.
• Use a vacuum cleaner to remove unwanted particles and dust without touching
• If you cannot remove unwanted particles and dust with a vacuum cleaner,
Repair or replace damaged wiring.
• Tighten loose screws.
• Replace damaged screws or terminals.
• Check coil voltage for overvoltage or undervoltage conditions.
• Replace broken relays, contactors, or circuit boards that you can remove.
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.
The drive does not have many serviceable parts and it could be necessary to replace
the drive.
Use a vacuum cleaner to remove unwanted particles and dust without touching the
components.
Table 8.3 Motor Periodic Inspection Checklist
Inspection Points
Stop the motor and contact approved maintenance personnel as necessary.
Table 8.4 Control Circuit Periodic Inspection Checklist
Inspection Points
• Tighten loose screws.
• Replace damaged screws or terminals.
• If terminals are integral to a circuit board, it could be necessary to replace the
• Tighten loose connections.
• Use a vacuum cleaner to remove unwanted particles and dust without touching
• If you cannot remove unwanted particles and dust with a vacuum cleaner,
• Do not use solvents to clean the board.
• The drive does not have many serviceable parts and it could be necessary to
Table 8.5 Cooling System Periodic Inspection Checklist
Inspection Points
Clean or replace the fans as necessary.
Use a vacuum cleaner to remove unwanted particles and dust without touching the
components.
Clear blockages and clean air duct as necessary.
Corrective Action
replace the drive.
the components.
replace the components.
Note:
On drive models, 2056, 2070, 4031, and 4038, you cannot replace the hex
screws.
Corrective Action
Corrective Action
control board or the drive.
the components.
replace the components.
replace the drive.
Corrective Action
8.2 Inspection
Checked
Checked
Checked
8
Checked
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