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4
Figure 2-6.
4–20 mA Output wiring.
PN 305725901, Rev YF
20 mA Output Wiring
–
4-20 mA Output, Loop Powered (TB-3) See Note 6
3
4-20 mA Output, Self Powered (TB-3) See Note 7
3
Notes
The cable should be shielded with a single twisted pair.
1. Cable should be shielded with single twisted pair.
2. Cable shields should be connected to both the analyzer and the DCS. If this is not
Cable shields should be connected to both the analyzer and the DCS.
possible, cable shields should be tied to the chassis at each 3050-OLV. If this is not
If this is not possible, cable shields should be tied to the chassis at each
possible, tie the shield at the PC or DCS to chassis and remaining shield to the chassis
through a 0.1 mF @ 500V capacitor.
3050-DO Analyzer. If this is not possible, tie the shield at the PC or
DCS to the chassis and the remaining shield to the chassis through a
3. The 3050 signal common is connected to earth ground. If the analog output is also
0.1 mF @ 500 V capacitor.
grounded, the analog output will no longer be electrically isolated. Contact AMETEK if
this situation occurs.
4. Analyzer power must be removed when connecting or disconnecting the 4-20 mA signal.
The 3050-DO Analyzer signal common is connected to earth ground. If
5. The 4-20 mA loop circuit must have a load resistance of between 100 and 500 ohms or
the analog output is also grounded, the analog output will no longer
malfunction may occur (Max 100 ohms when local 4-20 ma display is present). If a loop check is
be electrically isolated. Contact AMETEK if this situation occurs.
performed, a 100 ohm resistor must be placed in series with the ammeter.
Analyzer power must be removed when connecting or disconnecting
6. In Loop Powered mode, remove factory installed 100 Ω resistor at TB3-5 to TB3-6
the 4–20 mA signal.
and jumper at TB3-3 to TB3-4.
The 4–20 mA loop circuit must have a load resistance of between
7. In Self Powered mode when the optional local 4-20 ma display is present and no remote device
100–500 ohms or malfunction may occur (maximum 100 ohms when
is in use, the circuit must be completed with factory installed jumper from TB3-3 to TB3-4 and
local 4–20 mA display is present). If a loop check is performed, a 100
100 Ω resistor from TB3-5 to TB3-6.
ohm resistor must be placed in series with the ammeter.
4-20 mA Output, Wiring
4
5
6
100 Ohm
4
5
6
Installation and Start-Up
100 to 400 Ohm
500
-
+
R
Load
+ -
External 24V DC
Supply
100 to 300 Ohm
400
-
+
R
Load
|
2-13
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