7.2 Inspection
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual 285
Periodic Inspection &
Maintenance
7
■ Periodic Inspection
WARNING! Electrical Shock Hazard. Do not connect or disconnect wiring while the power is on. Failure to comply can result in serious
personal injury. Before servicing the drive, disconnect all power to the equipment. The internal capacitor remains charged even after
the power supply is turned off. The charge indicator LED will extinguish when the DC bus voltage is below 50 Vdc. To prevent electric
shock, wait at least five minutes after all indicators are OFF and measure the DC bus voltage level to confirm safe level.
Table 7.2 Periodic Inspection Checklist
Note: Periodic inspections should be performed every one or two years. The drive, however, may require more frequent inspection due
to poor environments or rigorous use.
Inspection Area Inspection Points Corrective Action Checked
Main Circuit Periodic Inspection
General
• Overall check of the main power circuit and ground
terminals
Take appropriate actions (e.g., tightening loose
connections).
• Inspect equipment for discoloration from
overheating or deterioration.
• Inspect for damaged or deformed parts.
• Replace damaged components as required.
• The drive has few serviceable parts and may
require complete drive replacement.
• Inspect for dirt, foreign particles, or dust collection
on components.
• Inspect enclosure door seal if present. Replace
components if cleaning is not possible.
• Use dry air to clear away foreign matter. Use a
pressure of 39.2 x 10
4
to 58.8 x 10
4
Pa (4 - 6
kgxcm
2
).
Conductors and
Wiring
• Inspect wiring and connections for discoloration,
damage, or heat stress.
• Inspect wire insulation and shielding for wear.
• Repair or replace damaged wiring.
Terminals
• Inspect terminals for stripped, damaged, or loose
connections.
• Tighten loose screws and replace damaged
screws or terminals.
Relays and
Contactors
• Inspect contactors and relays for excessive noise
during operation.
• Inspect coils for signs of overheating such as
melted or cracked insulation.
• Check coil voltage for over or under voltage
conditions.
• Replace damaged removable relays contactors
or circuit board.
Braking Resistors
• Inspect for discoloration of heat stress on or around
resistors.
• Minor discoloration may be acceptable.
• If discoloration exists check for loose
connections.
Motor Periodic Inspection
Operation Check • Check for increased vibration or abnormal noise.
• Stop the motor and contact qualified
maintenance personnel as required.
Control Circuit Periodic Inspection
General
• Inspect terminals for stripped, damaged or loose
connections.
• Check for tightness.
• Tighten loose screws and replace damaged
screws or terminals.
• If terminals are integral to a circuit board then
board or drive replacement may be required.
Cooling System Periodic Inspection
Cooling Fan
• Check for abnormal oscillation or unusual noise.
• Check for damaged or missing fan blades.
• Replace as required.
• Refer to Drive Cooling Fans on page 288 for
information on cleaning or replacing the cooling
fan.
Heatsink
• Inspect for dust or other foreign material collected
on the surface.
• Use dry air to clear away foreign matter.
• Use a pressure of 39.2 x 10
4
to 58.8 x 10
4
Pa (4 -
6 kgxcm
2
).
Air Duct
• Inspect air intake and exhaust openings. They must
be free from obstruction and properly installed.
• Visually inspect the area.
• Clear obstructions and clean air duct as
required.
LED Periodic Inspection
LEDs
• Make sure the LED lights correctly.
• Inspect for dust or other foreign material that may
have collected on surrounding components.
• Contact your Yaskawa representative if there is
any trouble with the LED or keypad.
• Clean the LED.
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