Output Connection; Special Construction To Support Solenoid Valve Testing; Vent - Fisher FIELDVUE DVC6200 Instruction Manual

DVC6200 Digital Valve Controller
Supply pressure must be clean, dry air that meets the
requirements of ISA Standard 7.0.01. A maximum 40
micrometer particle size in the air system is
acceptable. Further filtration down to 5 micrometer
particle size is recommended. Lubricant content is not
to exceed 1 ppm weight (w/w) or volume (v/v) basis.
Condensation in the air supply should be minimized.
Alternatively, natural gas may be used as the supply
pressure medium in Gas Certified DVC6200 digital
2
valve controllers. Gas must be clean, dry, oil-free, and
noncorrosive. H S content should not exceed 20 ppm.
2
If you are using a 67CFR filter regulator with standard
5 micrometer filter, connect the supply line to the 1/4
NPT IN connection and attach tubing from the output
connection on the filter regulator to the SUPPLY
connection on the instrument. If you are using an
integral mounted 67CFR filter regulator, connect the
supply to the IN connection on the regulator.

Output Connection

A factory mounted digital valve controller has its
output piped to the supply connection on the actuator.
If mounting the digital valve controller in the field,
connect the 1/4 NPT digital valve controller output
connection to the pneumatic actuator input connection.
Single-Acting Actuators
When using a single-acting direct digital valve
controller (relay A or C) on a single-acting actuator,
connect OUTPUT A to the actuator pneumatic input.
When using a single-acting reverse digital valve
controller (relay B) on a single-acting actuator, connect
OUTPUT B to the actuator diaphragm casing.
Double-Acting Actuators
DVC6200 digital valve controllers on double-acting
actuators always use relay A. With no input current,
OUTPUT A is at 0 pressure and OUTPUT B is at full
supply pressure when the relay is properly adjusted.
To have the actuator stem extend from the cylinder
with increasing input signal, connect OUTPUT A to the
upper actuator cylinder connection. Connect OUTPUT
B to the lower cylinder connection. To have the
actuator stem retract into the cylinder with increasing
input signal, connect OUTPUT A to the lower actuator
cylinder connection. Connect OUTPUT B to the upper
cylinder connection.
16
Special Construction to Support Solenoid
Valve Testing
Note
Solenoid valve testing is only available
for instrument level ODV.
In single-acting actuator applications with a solenoid
valve installed, the DVC6200 can be configured to test
the operation of the solenoid valve. This is
accomplished by connecting the "unused" output port
from the DVC6200 to the pneumatic line between the
solenoid valve and the actuator, as shown in figure
2-7. When single-acting, direct relay C is installed, the
"unused" output port is port B. When single-acting,
reverse relay B is used, the unused port is port A.
Note
This application is called "special
application" in the Setup Wizard relay
selection.
This configuration is not possible with
a double-acting actuator or when
using relay A in single-acting mode.

Vent

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.
September 2010