Emerson Fisher FIELDVUE DVC6000, Инструкция по эксплуатации

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DVC6000 Digital Valve Controllers
September 2013 2-26
FEEDBACK CONNECTIONS TERMINAL BOX
FEEDBACK UNIT
TO FEEDBACK UNIT TERMINAL 3
TO FEEDBACK UNIT TERMINAL 2
TO FEEDBACK UNIT TERMINAL 1
GROUND
SCREW
TERMINAL 1
TERMINAL 3
TERMINAL 2
W8478-1 / IL
W8475 / IL
W8477 / IL
W8476 / IL
BASE UNIT FEEDBACK UNIT
FEEDBACK CONNECTIONS
TERMINAL BOX
Figure 2-21. Terminal Details for Connecting Base Unit and Feedback Units of Remote-Mounted Digital Valve Controllers
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) 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 connections terminal box of
the DVC6005 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.
3RD PARTY FEEDBACK ELEMENT
(WITH 10k
W
POTENTIOMETER)
(30k
W
)
INTERNAL
3
1
30k
2
" 10k
W
BASE UNIT TERMINATION BOX
(DVC6005)
Figure 2-22. Terminal Details for Connecting a FIELDVUE
DVC6005 Base Unit and a 10k Ohm External Potentiometer
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).
2