Preventive Maintenance - YASKAWA E7N Technical Manual

Preventive Maintenance

Inspection Points
General
Transformers & Reactors
AC Power Circuit &
Devices
Control Circuits
Cooling System Cooling Fans/Fins & Heatsink
Keypad/Front Panel
Display
If the Drive is used under the following conditions, it may be necessary to inspect more often:
• High ambient temperatures, humidity or altitudes above 3,300 feet
• Frequent starting and stopping
• Fluctuations of the AC power supply or load
• Excessive vibration and/or shock loading
• Poor environment, including dust, metal particles, salt, sulfuric acid, chlorine
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Table 7.3 Preventive Maintenance
Item
Environment
Equipment
AC Power Supply
Conductors & Wire
Connections
Terminal Blocks
DC Bus Capacitors
Relays & Contactors
Soft Charge Resistors
Operation
Digital Operator and
Key and selector switch functionality
Front Panel
Maintenance 7 - 3
Check Points
Ambient Temperature
Humidity
Dust
Harmful Gas
Oil Mist
Abnormal vibration or noise
Main circuit & control voltage
Loose lugs, screws & wires
Hot spots on parts
Corrosion
Bent conductors
Breakage, cracking or discoloration
Check spacing
Discoloration or Noise
Loose, damaged
Leakage
Ruptures, broken, expansion
Capacitance & insulation resistance
Noisy
Contact discoloration
Cracked
Discoloration
Speed reference voltage/current
I/O contact operation
Relay logic
Abnormal fan noise
Loose connectors
Free of accumulation
LEDs
Monitor display values
Clean
Every 3-6 Months Yearly