Daily And Periodic Inspections - Hitachi P1-00080-L Basic Manual

Chapter 6

6.2 Daily and periodic inspections

Inspected Inspection
part entry
Surrounding Check the ambient temperature,
environment level of humidity, dust, ... etc.
General Whole inverter Check abnormal vibrations or noises
Power supply Check that the main circuit voltage
voltage is normal.
(1)Check the resistance between the
main circuit and the ground terminals.
General check
(2)Check looseness in fastened parts
(3)Check for overheating traces.
Conductor and (1)Check for straining in conductors
cables (2)Check for cable coating damage
Main
Terminal block Check for any damage.
circuit
Inverter and
converter
Check the resistance between all the
circuits
terminals
(Including
resistors)
(1)Check for capacitor fluid leakage
Smoothing
(2)Check that the relief valve does not
capacitor
swells or protudes.
(1)No chatter sound while operating
Relay
(2)Check contacts for damage
(1) While performing a unit operation
of the inverter, check the balance of
the output voltage among the
Control and
Operation
protection individual phases
check
circuits (2)Carry out a sequential protection
test, and check the protective and
display circuits for any abnormality
(1) Check for abnormal vibrations or
noises
Cooling Cooling-fan
system (2)Check for loose joints
Heat sink Check for obstructions/clogging.
(1)Check that LED lamps lights up
Display
(2)Display cleaning
Display
Check that Indicated values are
Meter
normal.
(1)Check abnormal vibrations noises
General
(2)Check that there is no stench.
Motor
Check the resistance between the
Insulation
main circuit and the ground
resistance
terminals.
*1) The life span of the smoothing capacitor is influenced by the
ambient temperature. Refer to [Smoothing capacitor life span
curve] for replacing measures.
*2) The life span of the cooling-fan is influenced by the ambient
temperature, the dirt and the change in its environmental
conditions. Check these circumstances on the usual inspection.
*3) The estimated time before replacement (Number of years/cycle) and
the [Smoothing capacitor life span curve] are based on the design
lifespan, so is an estimation value not that is not guaranteed.
Inspection cycle
Details of inspection
Daily
○
○
○
○
○
○
○
○
○
○
Inspection and maintenance
Every
Inspection method
1 2
year years
Refer to the installation guide.
Check visually and auditorily.
Measure the line-to-line
voltage of the inverter main
circuit terminals R,S and T.
Dismantle the inverter main
circuit terminals input/output
wiring and the control terminal
board, and remove the jumper
○ for the internal filter, after
that, shortcircuit the terminals
R,S,T,U,V,W,P,PD,N,RB,R0,T0,
and measure between this
shortcircuit and the ground.
○ Confirm tighten of fasteners.
○ Check visually.
○
Check visually.
○
○ Check visually.
Remove the inverter main
circuit terminal wiring, and
measure the following:
○ - Resistance between
terminals RST and PN.
- Resistance between
terminals UVW and PN
Check visually.
○ Check auditorily.
○ Check visually.
Measure the voltage between
○ the U,V,W terminals of the
inverter main circuit.
Simulate a shortcircuit or open
○ of the inverter output
protection circuit.
Turn by hand while electricity
is not being supplied
○ Check visually.
○ Check visually.
Check visually.
○ With cleaning rag.
Check the meter readings on
the panel.
Check visually,auditorily, and
by touch
Check for abnormal
superheating, damages an so
on.
Detach the U,V,W terminals
from the inverter main circuit,
and shortcircuit the motor
*6)
wiring, mesure with the
Megger® between the motor
wiring and ground terminal.
*4) In the case that the capacitors are replaced after that the storage
period of 3 years has expired, before the first use please refer to the
aging process under the following conditions before using them:
・First, apply for 1 hour the 80% of the capacitor rated voltage at
ambient temperature
・Then, raise the voltage to 90%, and keep it for 1 more hour.
・Finally, apply for 5 hours the rated voltage at ambient temperature
*5) In the case that the cooling-fan if affected by dust, obstructing it;
remove the dust, after that may take 5 to 10 seconds to start again.
*6) Follow the installed motor instructions
6-2
Criterion Tester device
Ambient temperature, level of Thermometer
humidity are withing the range. Hygrometer
No frozen part. No condensation. Data logger
Without abnormalities
Multimeter,
Within the AC voltage
Digital multimeter
permissible variation.
Meter
DC 500V class
Resistance no less than 5MΩ. Ohmmeter
(megger®)
Without abnormalities
Without abnormalities
Without abnormalities
Without abnormalities
Consult the "Method of
checking the inverter and
converter circuits". The inverter,
Analogue
capacitor and thyristor lifespan
multimeter
before replacing the
6
componentes is of 10
start/stop cycles *3)
That there are no abnormalities
Estimated number life span
Capacitance
before exchanging component:
meter
10 years
*1) *3) *4)
That there are no abnormalities.
That there are no abnormalities.
Phase-to-phase voltage balance
200V class: within 4V
Digital multimeter
400V class: within 8V Voltmeter
Ammeter
An error must be detected
according to the sequence.
Smooth operation without
abnomalities.
Replace every: 10 years
*2) *3) *5)
That there are not obstructions.
Confirm it lights up
Voltmeter
Regulation and control value
Ammeter
are satisfactory.
Etc.
Without abnormalities
Without abnormalities
DC 500V class
No less than 5MΩ. Ohmmeter
(megger®)