Panasonic VF0 Series, Instruction Manual

Page: 82 / 88

81
4. Maintenance and inspection table
Note) Symbols in the check frequency field have the following meanings:
œ
means daily,
means yearly and means every two years.
Locat
ion
Inspection
item
Check item
Check
frequency
Check method Test criteria Instrument
Installation
condition
Ambient
temperature, relative
humidity, dust, etc.
œ
See installation
precautions.
Ambient temp.:
–10 to 50°C
Relative humidity:
90%
max.
Thermometer
Hygrometer
Whole
system
Is there any
abnormal vibration
or noise?
œ
Visual inspection
and audible check Normal appearance
and noise
Whol
e system
Power
voltage Is the main circuit
voltage normal?
œ
Measure the input
voltage
323 to 506VAC Voltmeter
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 electrical
conductors
crooked?
(2) Is the cover
broken?
(1), (2)
Visual inspection
(1), (2) Normal
Transformer
reactor
Strange smells?
œ
By smell Normal
Terminal
blocks Is there any
damage?
Visual inspection Normal
Transistor
diode 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.
œ
œ
(1), (2)
Visual inspection
(3) Using a
capacitance
meter
(1), (2) Normal
(3) Minimum 85% of
rated capacity
Capacitance
meter
Ma
in c
ir
c
uit
Relays
(1) Is the operational
noise normal?
(2) Check the state
of contact
roughness.
(1) Audible check
(2) Visual inspection (1), (2) Normal
Resistor
(1) Are the insulators
cracked?
(2) Are any wires
disconnected?
(1), (2)
Visual inspection (1), (2) Normal
Continued on following page.