OMNI 4000/7000 Operations and Maintenance Guide
– Rev F
7-55
Maintenance
Test and Replace Fuses
Note the part number on any fuse you plan to replace and use the specifications in
Table 7-1 and Table 7-2 to verify that you are installing the correct fuse with the
matching part number.
If power is being provided to the flow computer but the flow computer is not on, or the flow
computer is providing power to an outside device and that device is not on, there could be a
problem with a fuse.
Test a suspected malfunctioning fuse by measuring across it with a multi-meter to test continuity.
If the fuse tests “Open,” it may need to be replaced.
To remove and replace a suspected malfunctioning fuse, follow these instructions:
1.
Follow your local procedures for taking the
flow computer out of service. Go to Section
7.4.2 for further instructions on saving
configurations, ending batches and
archiving data, if needed.
2.
Power down the flow computer.
WARNING:
When working with external devices connected to the OMNI 4000/7000
back panel, verify that no power is applied to the flow computer. External devices
may have their own source of power.
Observe precautions for handling electrostatic-sensitive devices.
3.
Verify that the power to the flow computer
is
OFF.
4.
Access the back panel or extended back
panel:
•
For panel mount and short extended
back panel devices, go to Step 5.
•
For extended back panel devices, go
to Step 8.
5.
Both fuses on the panel mount back panel
and the short extended back panel are
1/4 turn cartridge fuses that can be
unscrewed by hand.
By hand, carefully apply downward
pressure and turn the base of the fuse
holder counter-clockwise to remove the
fuse.