Compliance Voltage - Fisher FIELDVUE DVC6200 Instruction Manual

Cable Type
BS5308/1, 0.5 sq mm
BS5308/1, 1.0 sq mm
BS5308/1, 1.5 sq mm
BS5308/2, 0.5 sq mm
BS5308/2, 0.75 sq mm
BS5308/2, 1.5 sq mm
BELDEN 8303, 22 awg
BELDEN 8441, 22 awg
BELDEN 8767, 22 awg
BELDEN 8777, 22 awg
BELDEN 9501, 24 awg
BELDEN 9680, 24 awg
BELDEN 9729, 24 awg
BELDEN 9773, 18 awg
BELDEN 9829, 24 awg
BELDEN 9873, 20 awg
1. The capacitance values represent capacitance from one conductor to all other conductors and shield. This is the appropriate value to use in the cable length calculations.
2. The resistance values include both wires of the twisted pair.
CIRCUIT
UNDER
TEST
A6192-1/IL

Compliance Voltage

If the compliance voltage of the control system is not
known, perform the following compliance voltage test.
1. Disconnect the field wiring from the control system
and connect equipment as shown in figure 2-11 to the
control system terminals.
2. Set the control system to provide maximum output
current.
September 2010
Table 2-2. Cable Characteristics
(1)
Capacitance Capacitance
pF/Ft
61.0 200
61.0 200
61.0 200
121.9 400
121.9 400
121.9 400
63.0 206.7
83.2 273
76.8 252
54.9 180
50.0 164
27.5
22.1
54.9 180
27.1
54.9 180
kW
1
VOLTMETER
Figure 2-11. Voltage Test Schematic
(1)
Resistance
pF/m Ohms/ft
0.022
0.012
0.008
0.022
0.016
0.008
0.030
0.030
0.030
0.030
0.048
90.2 0.048
72.5 0.048
0.012
88.9 0.048
0.020
POTENTIOMETER
3. Increase the resistance of the 1 kW potentiometer,
shown in figure 2-11, until the current observed on the
milliammeter begins to drop quickly.
4. Record the voltage shown on the voltmeter. This is
the control system compliance voltage.
For specific parameter information relating to your
control system, contact your Emerson Process
Management sales office.
Installation
(2) (2)
Resistance
Ohms/m
0.074
0.037
0.025
0.074
0.053
0.025
0.098
0.098
0.098
0.098
0.157
0.157
0.157
0.042
0.157
0.069
MILLIAMMETER
2
21