Yaskawa MP940 - Manual (Page 343)

8.1 Inspection Items
8-3
8
8.1.2 Regular Inspections
This section describes inspection items that must be performed once or twice every six
months to one year. Inspections must also be performed when the equipment is relocated or
modified or when the wiring is changed.
Table 8.2 Regular Inspection Items
• Do not replace the built-in fuse.
If the customer replaces the built-in fuse, the MP920 may malfunction or break down.
Contact your Yaskawa representative.
Prohibited
No. Inspection Item Inspection Details Criteria Action
1 Operat-
ing
environ-
ment Ambient tem-
perature Check the tempera-
ture and humidity
with a thermometer
and hygrometer,
respectively.
Check for corrosive
gases. 0ºC to 55ºC If the MP940 is used
inside a panel, treat
the temperature
inside the panel as
the ambient tempera-
ture.
Ambient
humidity 30% to 95%
Atmosphere There must be no cor-
rosive gases.
2 Power supply voltage
check Measure the voltage
between 24-VDC
terminals. 19.2 to 28.8 VDC Change the power
supply as necessary.
3 Installa-
tion
condi-
tions Looseness
and excess
play Attempt to move the
Module. 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 Con-
nection
condi-
tions Check the
terminal
screws for
looseness. Check by retighten-
ing the screws. The screws must be
tight. Retighten.
Gap between
crimp terminals Visually check. There must be an
appropriate gap
between the terminals. Correct.
Looseness of
connectors Visually check. The screws must be
tight. Retighten the con-
nector set screws.
5 Battery Check the “BAT”
indicator on the front
panel of the MP940
Module. The “BAT” indicator
must be unlit. If the “BAT” indica-
tor is lit, replace the
battery.