Daily And Annual Maintenance - Hitachi L300P Series Service Manual

5.2 Daily and annual maintenance

Item
Ambient
Environment
Devices
overall
Power supply
voltage
Overall
Conductors /
cables
Terminal block
Inverter /
Converter
DC bus capacitor
Relay, contactor
Resistors
Cooling fan
Operation check
Display
Meter
Overall
Insulation
resistance
Contents
Check ambient temperature,
humidity, dust, corrosive gas, oil
mist, etc.
Check for abnormal vibrations
and noise.
Check voltage between
input lines
Megger check
(Power terminal - Earth)
Check installation for looseness.
Check for evidence of over
heating in the various
components
Cleaning
No change in shape?
No damage in coating?
No damage?
Tester check between each
terminal
Check for leaking liquid
Check for swelling
Check for capacitance
Check for stuttering noise during
operation
No damage of contact?
Check for cracks or
changes in color
No open circuit?
Check for abnormal
vibration and noise
Check for dust
Check the balance of the output
voltage of each phase to phase
without motor.
Perform a sequence protection
operation test and make sure
that there are no errors in the
protection and display circuits.
No illegible display;
No missing characters;
No segment failure of LEDs
Cleaning
Working correct?
No abnormal vibration & noise? X
No abnormal smell?
Megger check
All terminals together - Earth
5- 2
Interval
Method
D A
Refer to
X
2.1. Installation
X Visual inspection
Measure the voltage between
X
input terminals
Remove connector J61
Disconnect power line
Remove logic terminal
X Make short circuit R, S, T, U,
V, W, P, PD ,N ,RB
Megger test between above
and earth
X Tighten
X Visual inspection
X
X Visual inspection
X Visual inspection
X Visual inspection
Remove power cables
Measure resistance;
X
Each input
Each output
with 1ohm range
X Visual inspection
X Visual inspection
X With capacitance meter
X Aural inspection
X Visual inspection
X Visual inspection
X Tester check
Rotate manually
X
during power off
X Visual inspection
Measure the output voltage
X
between U, V and W
Simulate operation of the
X
protection circuit
X Visual inspection
X
X X Visual inspection
Visual, aural inspection
Confirm the smell caused by
X
overheat, damage etc.
Measure resistance;
Each input Earth
X
With and without motor
cables
Criteria
Ambient temperature:
-10 ~ +50°C (no icing)
No condensation
No abnormalities
No abnormalities and
within specifications
> 5Mohm
No abnormalities
No abnormalities
No abnormalities
No abnormalities
No abnormalities
Refer to
"5.5 How to measure
P, N
inverter &
P, N
converter" portion
No abnormalities
No abnormalities
85% or more of rated
capacitance
No abnormalities
No abnormalities
No abnormalities
Tolerance of within
10% of rated value
Smooth rotation and
no abnormalities
No abnormalities
Within 2% of voltage
difference between
each phases.
Each protection should
be performed
No abnormalities
Displays correct value
No abnormalities
No abnormalities
> 5Mohm