Yaskawa MP930 - Manual (Page 257)

Maintenance and Inspection
8.1.2 Regular Inspections
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Table 8.2 Regular Inspection Items
No. Inspection Item Inspection
Details
Criteria Action
1 Operating
environment Ambient
temperature Check the tempera-
ture and humidity
with a thermometer 0 to 55 °C If the MP930 is
used inside a panel,
treat the tempera
Ambient
humidity
with a thermometer
and hygrometer, re-
spectively.
33% to 95% RH
treat the tempera-
ture inside the panel
as the ambient tem-
Atmosphere Check for corrosive
gases. There must be no
corrosive gases.
perature.
2 Power supply
voltage check MC Unit Measure the voltage
between 24-VDC
terminals. 20.4 to 28.8 VDC Change the power
supply as necessary.
I/O Unit Measure the voltage
between 24-VDC
terminals. 20.4 to 28.8 VDC
3 Installation
conditions Looseness
and excess
play Attempt to move
the Unit. The Module must
be secured properly. Retighten the
screws.
Dust and
other foreign
matter Visually check. The Module must
be free from dust
and other foreign
matter. Clean.
4 Connection
conditions Check the ter-
minal screws
for looseness. Check by retighten-
ing the screws. The screws must be
tight. Retighten.
Gap between
crimp termi-
nals Visually check. There must be an
appropriate gap be-
tween the terminals. Correct.
Looseness of
connectors Visually check. The screws must be
tight. Retighten the con-
nector set screws.
5 Battery Battery Check the “BAT”
indicator on the
front panel of the
MC Unit. The “BAT” indica-
tor must be unlit. If the “BAT” indi-
cator is lit, replace
the battery.
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