Maintenance and Inspection
Section 6-4
6-5
6-4 Maintenance and Inspection
The V720 Series must be inspected on a daily or regular basis so that the functions of the V720 Series
can be used in good condition.
The V720 Series consists of semiconductors that last almost indefinitely. The following malfunctions
may, however, result due to the operating environment and conditions.
a. Element deterioration due to overvoltage or overcurrent.
b. Element deterioration due to continuous stress caused by high ambient temperature.
c. Connector contact faults or insulation deterioration due to humidity and dust.
d. Connector contact faults or element corrosion due to corrosive gas.
Item
No. Item
Detail
Criteria
Remarks
1
(1) Check that the supply voltage fluctuation
at the power supply terminal block is
within the permissible range.
Supply voltage rating
Voltage tester
Supply voltage
fluctuation
(2) Check that there is no frequent
instantaneous power failures or radical
voltage drops.
Within permissible voltage
fluctuation range
Power supply
analyzer
2 Environment
a. Ambient
temperature
b. Ambient
humidity
c. Vibration and
shock
d. Dust
e. Corrosive
gas
a. Check that the ambient temperature is
within the specified range.
b. Check that the humidity is within the
specified range.
c. Check that no vibration or shock is
transmitted from any machines.
d. Check that the system is free of adherence
or accumulation of dust or foreign matter.
e. Check that no metal part of the system is
discolored or corroded.
a. Check that the ambient
temperature is within the
specified range.
b. Check that the humidity is
within the specified range.
c. Check that the ambient
temperature and humidity are
within the specified ranges.
d. Check that there is no dust or
foreign matter.
e. Check that there is no
discoloration or corrosion.
Maximum and
minimum
thermometer
Hygrometer
3 Panel condition
a. Ventilation
b. Packing for
any enclosed
construction
a. Check that the system is ventilated
properly with natural ventilation, forced
ventilation, or cooling air.
b. Check that the packing is properly attached
with no damage.
a. The interior temperature must
be within a range between
-10°C and 50°C with proper
ventilation.
b. The packing has no damage.
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4 I/O power supply
a. Voltage
fluctuation
b. Ripple
Check on the I/O terminal block that the voltage
fluctuation and ripple are within the permissible
ranges.
The voltage fluctuation and ripple
must be within the specified
range.
Voltage tester
Oscilloscope
(1) Check that each device is securely
mounted.
There must be no loose screws.
-
(2) Check that each connector is securely
connected.
Each connector is locked or
securely tightened with screws
-
(3) Check that no screw of the terminal block
is loosened.
There must be no loose screws.
-
(4) Check that no wire is broken or nearly
broken.
There must be no wire that is
broken or nearly broken.
-
(5) Check that the distance between the Tag
and Antenna is within the specified range.
The distance between the Tag
and Antenna must be within the
specified range.
-
5 Mounting
condition
(6) Check that the GR terminal is grounded. The terminal must be grounded
to a resistance of 100 ohm or
less.
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