Fisher FIELDVUE DVC6200 Instruction Manual page 78

DVC6200 Digital Valve Controller
The DVC6200 digital valve controller enclosure is
rated NEMA 4X and IP66, therefore periodic cleaning
of internal components is not required. If the DVC6200
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, it can be removed, cleaned and
replaced. Lightly brush the exterior of the vent to
remove contaminants and run a mild water/detergent
solution through the vent to ensure it is fully open.
Allow the vent to dry before reinstalling.
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.
7
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.
Avoid personal injury or property
damage from sudden release of
process pressure or bursting of parts.
Before performing any maintenance
procedures on the DVC6200 digital
valve controller:
D Always wear protective clothing,
gloves, and eyewear.
D Do not remove 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.
70
WARNING
WARNING
WARNING
D Use bypass valves or completely
shut off the process to isolate the valve
from process pressure. Relieve process
pressure from both sides of the valve.
D Vent the pneumatic actuator loading
pressure and relieve any actuator spring
precompression.
D Use lock-out procedures to be sure
that the above measures stay in effect
while you work on the equipment.
D Check with your process or safety
engineer for any additional measures
that must be taken to protect against
process media.
WARNING
When using natural gas as the supply
medium, or for explosion proof
applications, the following warnings
also apply:
D Remove electrical power before
removing the housing cap. Personal
injury or property damage from fire or
explosion may result if power is not
disconnected before removing the
cap.
D Remove electrical power before
disconnecting any of the pneumatic
connections.
D When disconnecting any of the
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: ensuring
adequate ventilation and the removal
of any ignition sources.
D Ensure that the cover is correctly
installed before putting this unit back
into service. Failure to do so could
result in personal injury or property
damage from fire or explosion.
September 2010