Hitachi EH-150 Series - Chapter 8 Daily and Periodic Inspection; Periodic Inspection

Chapter 8 Daily and Periodic Inspection
8 - 2
8.2 Periodic inspection
Turn off the power for the external I/O and check the following items once every six months.
Table 8.2 Items for periodic inspection
Part
Item
Check criteria
Remarks
Programming
device to CPU
Check operation of
programming device
All switches and display lamps
work normally.
Power supply
Check for voltage
fluctuations
85 to 264 V AC
(AC power supply)
21.6 to 26.4 V DC
(DC power supply)
Tester
Installation and
connecting areas
(1) All modules are
securely fixed
(2) All connectors fit
snugly
(3) All screws are tight
(4) All cables are normal
No defects
Tighten
Check insertion
Tighten
Ambient
environment
(1) Temperature
(2) Humidity
(3) Other
0 to 55 C
20 to 90  RH (no condensation)
No dust, foreign matter,
vibration
Spare parts
Check number of parts,
storage condition
No defects
Program
Check program contents
Compare the contents of the
latest program saved and CPU
contents, and make sure they are
the same
Check both master and
backup.