Instruction Manual

DVC6000 SIS
September 2013
2-28
Test Connections
WARNING
Personal injury or property damage
caused by fire or explosion may occur
if this connection is attempted in a
potentially explosive atmosphere, or
in an area that has been classified as
hazardous. Confirm that area
classification and atmosphere
conditions permit the safe removal of
the terminal box cap before
proceeding.
Test connections inside the terminal box can be used
to measure loop current across a 1 ohm resistor.
1. Remove the terminal box cap.
2. Adjust the test meter to measure a range of 0.001
to 0.1 volts.
3. Connect the positive lead of the test meter to the
TEST + connection and the negative lead to the TEST
− connection inside the terminal box.
4. Measure Loop current as:
Voltage (on test meter)  1000 = milliamps
example:
Test meter Voltage X 1000 = Loop Milliamps
0.004 X1000 = 4.0 milliamperes
0.020 X 1000 = 20.0 milliamperes
5. Remove test leads and replace the terminal box
cover.
Communication Connections
WARNING
Personal injury or property damage
caused by fire or explosion may occur
if this connection is attempted in a
potentially explosive atmosphere or in
an area that has been classified as
hazardous. Confirm that area
classification and atmosphere
conditions permit the safe removal of
the terminal box cap before
proceeding.
A HART communicating device, such as a Field
Communicator or a personal computer running
ValveLink software communicating through a HART
modem, interfaces with the DVC6000 SIS digital valve
controller from any wiring termination point in the 4–20
mA loop. If you choose to connect the HART
communicating device directly to the instrument,
attach the device to the LOOP + and LOOP −
terminals or to the TALK + and TALK − connections
inside the terminal box to provide local
communications with the instrument.
Wiring Practices
Logic Solver or Control System
Requirements
There are several parameters that should be checked
to ensure the Logic Solver or control system are
compatible with the DVC6000 SIS digital valve
controller.
Voltage Available (In a Milliamp Current
Loop, Point-to-Point Mode Only)
The voltage available at the DVC6000 SIS digital valve
controller must be at least 11 VDC. The voltage
available at the instrument is not the actual voltage
measured at the instrument when the instrument is
connected. The voltage measured at the instrument is
limited by the instrument and is typically less than the
voltage available.
As shown in figure 2-24, the voltage available at the
instrument depends upon:
 the control system compliance voltage
 if a filter or intrinsic safety barrier is used, and
 the wire type and length.
The control system compliance voltage is the
maximum voltage at the control system output
terminals at which the control system can produce
maximum loop current.
The voltage available at the instrument may be
calculated from the following equation:
Voltage Available = [Control System Compliance
Voltage (at maximum current)] − [filter voltage drop (if
a HART filter is used)] − [total cable resistance 
maximum current] − [barrier resistance x maximum
current].
The calculated voltage available should be greater
than or equal to 11 VDC.
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