4.Maintenance and inspection table Note) Symbols in the check frequency field have the following meanings
㩷㩷㩷䃩㩷
means daily,
䂾㩷
means yearly and,
䃁㩷
means every two years.
Inspection
frequency
Ambient
environment
Transformer
and diode
Ambient temperature,
humidity, dust,ect.
See installation
precautions
Ambient temperature:
-10 to 50
㷄㩷
Humidity: 90% max.
Thermometer
hygrometer
Whole system Is there any abnormal vibration or noise?
Visual inspection and audible check Normal
Power
voltage
Is the main circuit
voltage normal?
Measure the
input voltage
200V
˖
170
䌾
253 V AC
voltmeter
Whole system
General
1) Check if all fastenings are tight
2) Any indication of overheating
on any part?
3) Clean
1) Tighten fastenings
2) Visual inspection
1), 2) Normal
Connected
electrical
conductors and wires
1) Are conductor crooked?
2) Is the cover broken?
1), 2) Visual inspection
Transformer Strange smell?
By smell
Normal
Terminal blocks Is there any damage?
Visual inspection
Normal
Check the resistance
between terminals
Disconnect main circuit
wires and measure at
terminal
Ohm meter
Smoothing
capacitor
1) Are there any liquid leaks?
2) Is the safety valve normal?
3) Measure electrostatic capacity.
1), 2) Visual inspection
3) Using a capacitance
meter
Capacitance
meter
Relay
1) Is the operational noise normal?
2) Check the state of contact roughness.
1) Audible check
2) Visual inspection
Resistor
1) Are the insulators cracked?
2) Are any wires disconnected?
1), 2) Visual inspection
Operation
checks
1) Check output voltage
balance between phases
during inverter operation
without application.
2) Check the protection
and display circuits with
the sequence protection
operation test.
1) Measure voltage
between output
terminals.
2) Simulate a short-
circuit between the
inverter warning
outputs.
1) Line output balance
is 4V max.
(400V type is 8V max.)
2) The sequence
protection circuit
must function
correctly.
1), 2) Normal
1), 2) Normal
3) Minimum 85% of
rated capacity
1), 2) Normal
All parts
Capacitor
1) Any strange smells or discoloration?
2) Are any of the connections loose?
Any trace of liquid leaks or deformation?
Inspection details
Inspection
item
Inspection
method
Test criteria
Instrument
1), 2) Visual inspection
and smell
1), 2) Normal
Visual inspection
Normal
1), 2) Normal
Cooling fan
1) Is there any abnormal vibration
or abnormal noise?
2) Are any of the connections loose?
1) Audible check
2) Tighten fastenings
1), 2) Normal
Display unit Are any LEDs not working?
Visual inspection
Normal
Meter
Are all readings correct?
Check indicated value
Voltmeter
Ammeter
General
1) Is there any abnormal
vibration or abnormal noise?
2) Strange smells?
1),2) Visual, audible
and smell test
1), 2) Normal
Rectifier
type
voltmeter
Main circuit
Control and protection circuits
Cooling
system
Display
Motor
䃩
䃩
䃩
䂾
䂾
䂾
䂾
䂾
䃩
䂾
䃁
䃩
䃩
䂾
䂾
䂾
䂾
䂾
䂾
䂾
䂾
䂾
䃩
䃩
䂾
䃩
䃩
䃩
䃩
location
Must be within standard
value and control value.
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