Instruction Manual

DVC6000 SIS
September 2013
2-26
Using an External 10 kOhm External
Potentiometer as a Remote Travel Sensor
Note
Potentiometer travel must be between
1.3 and 1.6 times greater than the
actuator travel. For example: if an
actuator has a travel of 9 inches, then
a linear potentiometer must be
selected with a rated travel between
11.7 and 14.4 inches. The resistive
element must be tapered from 0 kOhm
to 10 kOhm over rated travel of the
potentiometer. The actuator will only
use 63 to 76 % of the potentiometer
rated travel.
Note
The digital valve controller must be
configured using the SStem/Roller
selection on the menu of the
appropriate setup device.
The base unit (DVC6005 SIS) was designed to work
with a 40 kOhm potentiometer for travel feedback.
However, there are linear potentiometers that are
readily available with a rated resistance of 10 kOhm.
Therefore, the feedback terminal box of the DVC6005
SIS contains an additional 30 kOhm fixed resistor that
may be added to the circuit. This brings the total
resistance up to the required 40 kOhm.
1. Mount the external 10 kOhm potentiometer to the
actuator such that the mid-travel position of the
potentiometer (5 kOhm) corresponds to the mid-travel
position of the actuator. This will leave an equal
amount of unused resistive element on both ends of
the travel, which is required by the digital valve
controller to function properly.
2. On the base unit, remove the feedback
connections terminal box cap (see figure 2-16).
3. If necessary, install conduit between the
potentiometer and the base unit following applicable
local and national electrical codes. Route the
3-conductor shielded cable between the two units
(refer to figure 2-22).
3RD PARTY FEEDBACK ELEMENT
(WITH 10k W POTENTIOMETER)
(30k W)
INTERNAL
3
1
30k
2
"
10k W
BASE UNIT TERMINATION BOX
(DVC6005 SIS)
Figure 2-22. Terminal Details for Connecting a FIELDVUE
DVC6005 SIS Base Unit and a 10k Ohm External Potentiometer
4. Connect one wire of the 3-conductor shielded cable
between the Terminal labeled “30kW” 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.
2