Emerson Fisher FIELDVUE DVC6000, Instruction Manual

Page: 49 / 162

Installation
September 2013 2-27
4. Connect one wire of the 3-conductor shielded cable
between the terminal labeled “30k
W
” on the base unit
and one end lead of the potentiometer.
5. Connect the second wire of the 3-conductor
shielded cable between the middle lead (wiper) of the
10 kOhm potentiometer to Terminal 2 on the base
unit.
6. Connect the third wire of the 3-conductor shielded
cable between Terminal 3 on the base unit and the
other end-lead of the 10 kOhm potentiometer.
7. Connect the cable shield or drain wire to the
ground screw in the feedback connections terminal
box of the base unit. Do not connect the shield or
drain wire to the external potentiometer.
8. Replace and tighten the base unit cover.
Using a Potentiometer with Two Fixed
Resistors as a Remote Travel Sensor
Perform the following procedure if a potentiometer is
used with the same, or slightly longer travel than the
actuator’s travel.
Note
The potentiometer must be capable of
resistance close to 0 Ohms.
CAUTION
To prevent damage to the
potentiometer, ensure that it is free to
travel the entire length of the
actuator’s travel.
Note
The digital valve controller must be
configured using the SStem/Roller
selection on the menu of the
appropriate setup device.
This procedure uses three resistors connected in
series, two fixed resistors and one potentiometer.
Three conditions must be met for the resistor
combination to correctly operate the digital valve
controller:
3
1
30k
W
(R
2
)
(R1)
2
"
(R
pot
)
THREE-RESISTOR SERIES
BASE UNIT TERMINATION BOX
(DVC6005)
Figure 2-23. Terminal Details for Connecting a FIELDVUE
DVC6005 Base Unit and a Three-Resistor Series
The maximum resistance of the potentiometer
(R
pot(max)
) must be between 3.9 kOhm and 10 kOhm.
The resistance of R
1
is 4.25 times greater than
R
pot(max)
.
The resistance of R
2
is 4 times less than
R
pot(max)
.
WARNING
To avoid personal injury or property
damage from an uncontrolled process
ensure that the R1 resistor is properly
insulated before installing it in the
terminal box.
1. On the base unit, remove the feedback
connections terminal box cap (see figure 2-16).
2. If necessary, install conduit between the
two-resistor series and the base unit following
applicable local and national electrical codes. Route
the 3-conductor shielded cable between the two units
(refer to figure 2-23).
3. Install the fixed resistor (R
1
) across the unlabeled
bottom Terminal and Terminal #1. The bottom terminal
does not have a screw. The screw on the 30 kOhm
terminal can be used. R1 must be properly insulated
when installed in the terminal box to prevent personal
injury or property damage.
4. Connect one wire of the 3-conductor shielded cable
between the unlabeled bottom Terminal on the base
unit and an end-lead of the external potentiometer
(R
pot
).
5. Connect the second wire of the 3-conductor
shielded cable between the middle lead (wiper) of the
external potentiometer (R
pot
) and Terminal 2 on the
base unit.
2