YASKAWA ELECTRIC
SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
401
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.
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. Failure to obey will cause death or serious injury.
Table 7.2 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.
•
Check 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.
•
If you cannot remove unwanted particles and dust with a
vacuum cleaner, replace the components.
Table 7.3 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.