A flashing heartbeat on any module means that the onboard processor is functioning.
This is a good indication that a problem may be elsewhere.
The system view for the flow computer includes the power distribution that starts with the proper power source being applied to the back panel
terminal, distributed through the ribbon cables to the power supply unit (PSU), and then through the back panel mother board to the individual
cards. Trouble shooting power issues is a process of elimination through observation.
• Check the PSU green LED is
illuminated (DC power). If not,
proceed to the next row of this table,
PSU green LED, +24 V (D6) and +5
V (D7) illuminated (AC powered).
• Check communications and digital
modules, which may be illuminated
by external circuits.
• Check the CPU heartbeat and Digital
Mux (if a part of the system)
heartbeats.
• Check AC and DC fuses.
• Check ribbon cables A (and ribbon
cable B for the 7000) and the AC
power cable to the PSU for:
− Proper connection
− No bent pins
− Proper orientation especially on
the NEMA optioning option
(The connections are labeled and keyed)
• Replace with a spare power supply to
test.
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