Daily And Periodic Inspections - Hitachi NES1-004SB Quick Reference Manual

Chapter 11 Maintenance and Inspection

11.2 Daily and Periodic Inspections

Item Inspected
Ambient
environment
Major
Overall
devices
Power
supply
voltage
Ground
Insulation
Ground
terminal
Components Overheating
Terminal
Main block
circuit
Smoothing
capacitors
Relay(s)
Resistors
Function
Control
circuit
Overall
Capacitor
Terminal
Cooling fan
Cooling
Heat sink
Display LEDs
Note 1: The life of a capacitor is affected by the ambient temperature. See "11.6".
Note 2: Designed life of a cooling fan is.10 years. However, it is affected by the ambient
temperature and other environmental conditions.
Note 3: The inverter must be cleaned periodically. If dust accumulates on the fan and heat sink, it
can cause overheating of the inverter.
Note 4: Do not pull the cooling FAN's wire, otherwise cooling FAN might cut the wires and cause
failure.
Inspection
Check for...
Daily
Extreme
temperatures &
humidity
Abnormal noise &
vib.
Voltage tolerance
Adequate resistance
No loose screws
Secure connections
No loose screws
Leaking, swelling
Chattering
Cracks or discoloring
Voltage balance
between phases
Protection circuit
No odor, discoloring,
corrosion
Leaking, swelling
No loose screws
Noise
Dust
Mounting
Dust
Legibility
Inspection
Cycle
Method
Year
 Thermometer,
hygrometer
 Visual and aural
 Digital volt meter,
measure between
inverter terminals
[L1], [L2], [L3]
 Refer to P6-16
 Torque wrench
 Thermal trip events No trip events
 Visual
 Torque wrench
 Visual
 Aural
 Visual
 Measure voltage
between U,V,W
 e.g. Input Ex.trip
signal and check
inverter behavior
and alarm signal.
 Visual
 Visual
 Torque wrench
 Power down,
manually rotate
 Visual
 Visual
 Visual
 Visual
11 - 2
Criteria
Ambient temperature between
–10 to 50C,
Humidity 90% or less
non-condensing
Stable environment for electronic
controls
200V class: 50/60 Hz
200 to 240V (-15/+10%)
400V class: 50/60 Hz
380 to 480V (-15/+10%)
5 M or greater
M4: 0.8Nm
No abnormalities
M3.5: 1.0Nm
M4: 1.5Nm
No abnormalities
Single click when switching ON
or OFF
Check Ohms of optional braking
res.
Difference must be 2% or less.
Functions properly.
No abnormalities
Undistorted appearance
M2: 0.2Nm
Rotation must be smooth
Vacuum to clean
Mounted firmly
Vacuum to clean
All LED segments work