Emerson Fisher FIELDVUE DVC6000f Instruction Manual page 269

Maintenance
The DVC6000f digital valve controller enclosure is
rated NEMA 4X and IP66, therefore periodic cleaning
of internal components is not required. If the
DVC6000f is installed in an area where the exterior
surfaces tend to get heavily coated or layered with
industrial or atmospheric contaminants, however, it is
recommended that the vent (key 52) be periodically
inspected to ensure it is fully open. If the vent appears
to be clogged, the vent can be removed, cleaned and
replaced. Lightly brush the exterior of the vent to
remove contaminant and run a mild water/detergent
solution through the vent to ensure it is fully open.
WARNING
Personal injury or property damage
can occur from cover failure due to
overpressure. Ensure that the
housing vent opening is open and
free of debris to prevent pressure
buildup under the cover.
WARNING
To avoid static discharge from the
plastic cover, do not rub or clean the
cover with solvents. To do so could
result in an explosion. Clean with a
mild detergent and water only.
WARNING
Avoid personal injury or property
damage from sudden release of
process pressure or bursting of parts.
Before performing any maintenance
procedures on the DVC6000f digital
valve controller:
D Always wear protective clothing,
gloves, and eyewear to prevent
personal injury.
D Do not removed the actuator
from the valve while the valve is still
pressurized.
D Disconnect any operating lines
providing air pressure, electric power,
or a control signal to the actuator. Be
sure the actuator cannot suddenly
open or close the valve.
December 2009
Maintenance and Troubleshooting
shut off the process to isolate the valve
from process pressure. Relieve process
pressure from both sides of the valve.
loading pressure and relieve any
actuator spring precompression.
that the above measures stay in effect
while you work on the equipment.
engineer for any additional measures
that must be taken to protect against
process media.
When using natural gas as the supply
medium, or for explosion proof
applications, the following warnings
also apply:
removing the housing cap. Personal
injury or property damage from fire or
explosion may result if power is not
disconnected before removing the
cap.
disconnecting any of the pneumatic
connections.
pneumatic connections or any
pressure retaining part, natural gas
will seep from the unit and any
connected equipment into the
surrounding atmosphere. Personal
injury or property damage may result
from fire or explosion if natural gas is
used as the supply medium and
appropriate preventive measures are
not taken. Preventive measures may
include, but are not limited to, one or
more of the following: Remote
venting of the unit, re-evaluating the
hazardous area classification,
ensuring adequate ventilation, and
the removal of any ignition sources.
For information on remote venting of
this controller, refer to page 2-21.
D Use bypass valves or completely
D Vent the pneumatic actuator
D Use lock-out procedures to be sure
D Check with your process or safety
WARNING
D Remove electrical power before
D Remove electrical power before
D When disconnecting any of the
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