User Manual

8-4
To maintain V670 Series in the best condition, you need to inspect it daily or periodically. V670 Series mainly consists of semiconduc-
tor components which have a long life. However, the following malfunctions are expected depending on the service environment or
operating condition.
(1) Deterioration of element due to over-voltage or over-current.
(2) Deterioration of element due to long-term stress arisen from use in a high-temperature site.
(3) Deterioration of insulation or imperfect contact of connector due to unsuitable temperature or dust.
(4) Imperfect contact of connector or corrosion of element due to corrosive gas.
♦
Inspection item
No. Inspection Item Inspection Criterion Remarks
1 Fluctuation of power sup-
ply voltage
(1) Check at a terminal block of
power supply whether the
criterion is satisfied.
Within the specifications
for power supply voltage.
Tester.
(2) Check whether instanta-
neous power failure occurs
frequently and whether volt-
age fluctuates considerably.
Within a allowable voltage
fluctuation range.
Power supply
analyzer.
2 Ambient environment
(a) Temperature
(b) Humidity
(c) Vibration or impact
(d) Dust
(e) Corrosive gas
(a) Within the specifications.
(b) Within the specifications.
(c) Influence of vibration or
impact of machines.
(d) Dust or foreign material.
(e) Discoloration or corrosion in
a metal part.
(a) Within the specifications.
(b) Within the specifications.
(c) Within the specifications.
(d) Neither dust nor foreign
material is acceptable.
(e) Neither discoloration nor
corrosion is acceptable.
Lowest tempera-
ture thermometer.
Hygrometer.
3 Panel conditions
(a) Whether the panel is
ventilated.
(b) Whether packing mate-
rial of sealed structure
is deteriorated.
(a) Check whether natural ven-
tilation, forced ventilation
and cooling are performed.
(b) Check whether packing
material in the panel is
removed or damaged.
(a) Ventilation must be
made properly.
Temperature must be
within -10 to +55°C.
(b) Any damage is unac-
ceptable.
—
4 Power supply for I/O
(a) Voltage fluctuation
(b) Ripple
Check at a terminal block of
every I/O section whether crite-
rion is satisfied.
Within the specifications. Tester.
Oscilloscope.
5 Mounting state (1) Whether every device is
fixed tightly.
Every device must be fixed
tightly.
—
(2) Whether every connector is
inserted completely.
Every connector must be locked
properly and fixed by screws.
—
(3) Whether terminal block screws
are tightened completely.
The terminal block screws
must be tightened completely.
—
(4) Whether wire is not dam-
aged.
The wire must not be dam-
aged.
—
(5) Whether condition between
a tag and antenna is within
the specifications.
The condition must be
within the specifications.
—
(6) Whether grounding com-
plies with the Class D (con-
ventional Class III).
—
6 Error logging Check the details of error. —
8-4 Maintenance and Inspection