Yaskawa MP920 User's Manual Design - Manual (Page 475)

11.1 Inspection Items
11-3
11
11.1.2 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.
• 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
Regular Inspection Items
No. Inspection Item Inspection Details Criteria Action
1 Operating
environment Ambient
temperature Check the temperature
and humidity with a ther-
mometer and hygrome-
ter, respectively.
Check for corrosive
gases. 0 to 55 °C If the MP930 is used
inside a panel, treat
the temperature
inside the panel as
the ambient tempera-
ture.
Ambient
humidity 30% to 95% RH
Atmosphere There must be no cor-
rosive gases.
2 Power supply
voltage check PS-01
Module Measure the voltage
between 100/200 VAC
terminals. 85 to 276 VAC Change the power
supply as necessary.
PS-03
Module Measure the voltage
between 24-VDC termi-
nals. 20.4 to 28.8 VDC
3 Installation
conditions 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 Connection
conditions Check the terminal
screws for loose-
ness. Check by retightening
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 con-
nectors Visually check. The screws must be
tight. Retighten the con-
nector set screws.
5 Battery Battery Check the “BAT” indica-
tor on the front panel of
the CPU Module. The “BAT” indicator
must be not lit. If the “BAT” indica-
tor is lit, replace the
battery.