Cleveland Motion Controls DIN Rail Amplifier MWI-13262 Ultra Series Non-Isolated REV BA - Manual (Page 16)

DIN R AIL A MPLIFIER , MWI-13262 U LTRA S ERIES MAN-13262 U LTRA R EV BA
2.13.2.1 4 TO 20 M A A NALOG C URRENT L OOP
The 4-20 mA current loop output is undamped and can be used concurrently with the other outputs. The 20 mA
current level corresponds to the +10V output. The 4 mA level corresponds to 0 volts on the 10V output.
This output does not have an individual Gain and Zero Potentiometer adjustment. If multiple types of analog output
are being used, a compromise must be made during calibration, or a particular output be favored (over one that can
best accommodate individual external scaling and offsetting).
The bias supply to drive the current loop is provided internally by the Ultra amplifier. External burden resistance
(loop resistance) can range between 50 and 750 ohms.
The circuitry which drives the current loop is essentially a linear regulator stage. This means that internal power
dissipation (hence temperature rise) is lessened when higher values of external burden resistance are used.
Moderate values of burden resistance can be strategically employed to minimize internal temperature rise (and
thereby minimize amplifier drift in sensitive applications).
7
8
4
6
5
1
3
2
2
5
3
4
1
8
6
7
LOOP RESISTANCE
SHIELD GND
+
4 to 20 mA
i
+
50 - 750 OHMS
Figure 8 - Output Wiring, 4 to 20 mA Analog Current Loop, Floating Burden
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