Maintenance 7 - 3
Preventive Maintenance
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
Table 7.3 Preventive Maintenance
Inspection Points
Item
Check Points
Every 3-6 Months
Yearly
General
Environment
Ambient Temperature
Humidity
Dust
Harmful Gas
Oil Mist
X
X
X
X
X
Equipment
Abnormal vibration or noise
X
AC Power Supply
Main circuit & control voltage
X
AC Power Circuit &
Devices
Conductors & Wire
Connections
Loose lugs, screws & wires
Hot spots on parts
Corrosion
Bent conductors
Breakage, cracking or discoloration
Check spacing
X
X
X
X
X
X
Transformers & Reactors
Discoloration or Noise
X
Terminal Blocks
Loose, damaged
X
DC Bus Capacitors
Leakage
Ruptures, broken, expansion
Capacitance & insulation resistance
X
X
X
Relays & Contactors
Noisy
Contact discoloration
X
X
Soft Charge Resistors
Cracked
Discoloration
X
X
Control Circuits
Operation
Speed reference voltage/current
I/O contact operation
X
X
Cooling System
Cooling Fans/Fins & Heatsink
Abnormal fan noise
Loose connectors
Free of accumulation
X
X
X
Keypad/Display
Digital Operator
LEDs
Monitor display values
Key functionality
Clean
X
X
X
X
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