Emerson Fisher FIELDVUE DVC2000, Instruction Manual, Page: 25 / 106

Installation
July 2009 2-11
5. Replace the cover if the local interface is not being
used for configuration or calibration.
Options Boards
All three options circuits (transmitter, switch 1 and
switch 2) control current from an external power
source similar to the operation of a 2-wire transmitter.
Limit Switches
On units that are supplied with integral limit switches,
additional terminals provide the field wiring connection
point. The limit switches are isolated from each other
and from the digital valve controller’s primary
feedback. If only one switch is to be used, you must
use channel 1. Although electrically isolated per
Intrinsic Safety requirements, channel 2 derives its
power from channel 1. Therefore channel 2 cannot be
used alone.
Wire the limit switches as follows:
1. Remove the main instrument cover.
2. Route the field wiring into the terminal box through
the conduit connection. When applicable, install
conduit using local and national electrical codes that
apply to the application.
3. Connect the control system input card positive wire
“switch input” to the +41 terminal. Connect the control
system input card negative wire “switch input” to the
−
42 terminal. Refer to figure 2-15.
4. If a second switch is to be used, connect the
control system input card positive wire “switch input” to
the +51 terminal. Connect the control system input
card negative wire “switch input” to the
−
52 terminal.
5. Proceed to the Basic Setup section to configure the
switch action.
6. Replace the cover if the local interface is not being
used for configuration or calibration.
Position Transmitter
On units that are supplied with an integral valve
position transmitter, additional terminals provide the
field wiring connection point. The position transmitter
circuit in the DVC2000 derives it’s operating power
from the 4-20 mA control system input in the same
manner as a 2-wire transmitter. In addition, the
transmitter function gets position information (through
an opto-isolator) from the digital valve controller so the
4-20 mA position control loop must also be powered in
order for the position transmitter to provide an output
representing the valve position.
Figure 2-15. Loop, Transmitter, and Limit Switch Terminals
HART COMMUNICATION
TERMINATION
POINTS
+31/
−
32 (TRANSMITTER)
+11/
−
12 (LOOP)
+41/
−
42 (SWITCH 1)
+51/
−
52 (SWITCH 2)
W8838
Note
In an Intrinsically Safe installation with
the options in use, the wire pairs must
be shielded. Additionally, to prevent
cross-wiring, the individual wires must
not be exposed beyond the terminal
barrier walls.
Wire the position transmitter as follows:
1. Remove the main instrument cover.
2. Route the field wiring into the terminal box through
the conduit connection. When applicable, install
conduit using local and national electrical codes that
apply to the application.
3. Connect the control system input card positive wire
“current input” to the +31 terminal. Connect the control
system input card negative wire “current input” to the
−
32 terminal. Refer to figure 2-15.
4. Replace the cover if the local interface is not being
used for configuration or calibration.
2