Mitsubishi Electric Q26UD(E)HCPU User Manual page 106

• Momentary power failure may be detected or the CPU module may be reset due to serge caused by
lightning.
As measures against a noise caused by surge, connect a surge absorber for lightning as shown in the
following figure.
Using the surge absorber for lightning can reduce the influence of lightning.
• Use an online UPS (uninterruptible power supply) with power distortion factor of 5% or less or line-interactive
UPS. For a standby system UPS, use Mitsubishi small-capacity UPS "FREQUPS FW-F series" (hereafter
abbreviated as FW-F series).
Do not use any standby system UPS other than the FW-F series.
*1 Use a FW-F series UPS with the serial number starts with P or later or ends with HE.
● Separate the ground of the surge absorber for lightning (E1) from that of the programmable controller (E2).
● Select a surge absorber for lightning whose power supply voltage does no exceed the maximum allowable circuit voltage
even at the time of maximum power supply voltage elevation.
104
AC
E1
*1
(Example: FWF10-0.3K/0.5K)
Programmable
controller
I/O equipment
E2
Surge absorber for lightning
Starts with "P" or later
Ends with "HE"