Hitachi SH1 Series Basic Manual page 109

Chapter 6
6.2 Daily and periodic inspections
Inspected Inspection
part entry
Surrounding Check the ambient temperature,
environment level of humidity, dust, ... etc..
General Check that there are no abnormal
Whole inverter
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 that there are no abnormal
vibrations or noises.
Cooling-fan
Cooling
system (2)Check for loose joints.
Heat sink Check for obstructions/clogging.
(1) Check if the charge lamp LED and
the Keypad's LEDs and LCD light up.
Display
(2)Display cleaning.
Display
Check that Indicated values are
Meter
normal.
(1)Check that there are no abnormal
vibrations or noises.
General
(2)Check that there is no odour.
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, not guaranteed.
Inspection cycle
Details of inspection
Daily
○
○
○
○
○
○
○
○
○
Inspection and maintenance
*4) In the case that the capacitors are replaced after that the storage
Every
Inspection method
1 2
year years
Refer to Chapter 2
"Installation and Wiring" .
Check visually and auditorily.
Measure the line-to-line
voltage of the inverter main
circuit terminals R,S and T.
Remove 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 meters readings on
the control 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.
period of 3 years has expired, perform aging under the following
conditions before using the inverter:
・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) If the cooling fan is locked due to dust, etc., it takes 5 to 10 seconds
to restart even if dust is removed.
*6) Follow the instruction manual for the motor.
6-2
Criterion Tester device
Ambient temperature, level of
Thermometer.
humidity are withing the range.
Hygrometer.
No frozen part. No
Data logger.
condensation.
No abnormality.
Multimeter.
Within the AC voltage
Digital
permissible variation.
multimeter.
DC 500V class
Resistance no less than 5MΩ. Ohmmeter.
(megger®)
No abnormality.
No abnormality.
No abnormality.
No abnormality.
Refer the "6.5 Checking
method for inverter/
converter ". The inverter,
Analog
capacitor and thyristor lifespan
multimeter.
before replacing the
6
componentes is of 10
start/stop cycles. *3)
No abnormality.
Estimated years life span
Capacitance
before exchanging component:
meter.
10 years.
*1) *3) *4)
No abnormality.
No abnormality.
Phase-to-phase voltage
Digital
balance 200V class: within 4V.
multimeter.
400V class: within 8V.
Voltmeter.
Ammeter.
An error must be detected
according to the sequence.
Smooth operation.
No abnormality.
Replace every: 10 years.
*2) *3) *5)
Chack that there is no clogging.
Confirm they light up.
Voltmeter.
Regulation and control value
Ammeter.
are satisfactory.
Etc.
No abnormality.
No abnormality.
DC 500V class
No less than 5MΩ. Ohmmeter.
(megger®)