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MAN0443.P65 Issue 13 Aug 04
5701 Control System
05701-M-5001 A02279
CHAPTER 4 - INSTALLATION INSTRUCTIONS
11.5
4-20mA Loop Powered Sensors:
The maximum line resistance of cabling for a 4 - 20mA loop powered
sensor varies with the voltage drive requirements of the type of sensor
installed. It is also subject to a 20V maximum loop drive voltage.
Maximum line loop resistance is calculated as follows:
20 - V
s
R
L
=
0.025
Where:
R
L
=
Total Line Resistance (ohms)
V
s
=
Minimum Sensor Operating Voltage (V)
11.6
4-20mA Transmitters
The maximum line resistance of cabling for a 4 - 20mA transmitter
powered from the System 57 varies with the voltage and current
requirements of the transmitter. It is also subject to the minimum
supply voltage available from the System 57.
Maximum line loop resistance is calculated as follows:
V
r
- V
s
R
L
=
I
s
Where:
R
L
=
Total Line Resistance (ohms)
V
r
=
Minimum DC Supply to System 57 (V)
V
s
=
Sensor Voltage (V)
I
s
=
Sensor Current (A)
Making the above calculation using a V
r
of 18V will accommodate the
worst case low dc supply situation.
The maximum resistance
per core
can be calculated from the above
configurations as follows:
R
L
Maximum Resistance of Core =
ohms
2
Содержание 5701
Страница 1: ...Sieger System 57 5701 Control System Operating Instructions ...
Страница 45: ...2 32 MAN0443 P65 Issue 13 Aug 04 5701 Control System 05701 M 5001 A02279 CHAPTER 2 SYSTEM DESCRIPTION ...
Страница 63: ...3 18 CHAPTER 3 CONTROLS AND FACILITIES MAN0443 P65 Issue 13 Aug 04 5701 Control System 05701 M 5001 A02279 ...
Страница 139: ...4 76 MAN0443 P65 Issue 13 Aug 04 5701 Control System 05701 M 5001 A02279 CHAPTER 4 INSTALLATION INSTRUCTIONS ...
Страница 173: ...6 12 MAN0443 P65 Issue 13 Aug 04 5701 Control System 05701 M 5001 A02279 CHAPTER 6 OPERATING INSTRUCTIONS ...
Страница 209: ...9 4 MAN0443 P65 Issue 13 Aug 04 5701 Control System 05701 M 5001 A02279 CHAPTER 9 ORDERING INFORMATION ...