OMNI 4000/7000 Installation Guide – Rev H
PSU green LED not
illuminated
PSU green LED, +24 V (D6)
and +5 V (D7) illuminated (AC
powered)
Power, fuse, or line problem
• Try DC power, if available, to
determine if the AC power source
malfunctioned.
• If the flow computer does not power
on, replace the PSU.
Faulty field wiring is loading down the
system
• Remove All I/O and communication
cards. With just the front panel, CPU,
and PSU connected, reapply power.
• If the flow computer powers on, then
power the unit off and inspect and
install each I/O board one at a time.
• If the flow computer does not power
on, replace the PSU.
Flow Computer will not
power on AC
For unit powered by 24 VDC,
the large green LED is off
(DC powered)
Power, fuse, or line problem
• Use a spare power supply for
troubleshooting.
• If the flow computer does not power
on, check the fuses and lines.
Faulty field wiring is loading down the
system
• Remove All I/O and communication
cards. With just the front panel, CPU,
and PSU connected, reapply power.
• If the flow computer powers on, then
power the unit off and inspect and
install each I/O board one at a time.
• If the flow computer does not power
on, replace the PSU.
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