Hitachi SJ300-037HFE 사용자 설명서

Maintenance and Inspection

T

roub

leshooting

and Maintenance

Note 1: The life of a capacitor is affected by the ambient temperature. See 

.

Note 2: The inverter must be cleaned periodically. If dust accumulates on the fan and heat 

sink, it can cause overheating of the inverter.

Overall

Ambient 
environment

Extreme
temperatures
& humidity

✔

Thermometer, 
hygrometer

Ambient temperature 
between -10 to 50°C, 
non-condensing

Major devices

Abnormal 
vibration, 
noise

✔

Visual and aural

Stable environment for 
electronic controls

Power supply 
voltage

Voltage toler-
ance

✔

Digital volt meter, 
measure between 
inverter terminals 
[L1], [L2], [L3]

200V class:
200 to 240V 50/60 Hz
400V class:
380 to 460V 50/60 Hz

Main 
circuit

Ground
Insulation

Adequate 
resistance

✔

Megger test

500VDC, reading of 5M 
ohms or greater, see next 
section for test details

Mounting

No loose 
screws

✔

Torque wrench

M3: 0.5 – 0.6 Nm
M4: 0.98 – 1.3 Nm
M5: 1.5 – 2.0 Nm

Components

Overheating

✔

Thermal trip events

No trip events

Housing

Dirt, dust

✔

Visual

Vacuum dust and dirt

Terminal block

Secure 
connections

✔

Visual

No abnormalities

Smoothing 
capacitor

Leaking, 
swelling

✔

Visual

No abnormalities

Relay(s)

Chattering

✔

Aural

Single click when 
switching ON or OFF

Resistors

Cracks or 
discoloring

✔

Visual

Use Ohm meter to check 
braking resistors

Cooling fan

Noise

✔

Power down, 
manually rotate

Rotation must be smooth

Dust

✔

Visual

Vacuum to clean

Control 
circuit

Overall

No odor, 
discoloring, 
corrosion

✔

Visual

No abnormalities

Capacitor

No leaks or 
deformation

✔

Visual

Undistorted appearance

Display

LEDs

Legibility

✔

Visual

All LED segments work