Cleveland Motion Controls DIN Rail Amplifier MWI-13261 Ultra Series Isolated REV BA - Manual (Page 19)

MAN-13261 R EV BA DIN R AIL A MPLIFIER , MWI-13261 U LTRA
While possible to interface the 4-20 mA current loop into circuits which do exhibit resistances between their burden
and the amplifier isolated COM, (Refer to Figure XX.), this is a less desirable configuration. If you chose to wire the
amplifier in this way, you must keep the following in mind. When the commons of both circuits are connected, be
sure that the amplifier’s 4-20 mA OUT remains unconnected and that the 4-20 mA RET (J2-8) is connected to draw
loop current from a ground referred burden resistance at the receiving circuit. The burden resistance must not exceed
250 Ohms due to the reduced bias voltage, however a full-scale signal of -5.0 VDC is still possible (-5V= -20 mA x
250 Ohms).
4 to 20 mA
SHIELD GND
LOOP RESISTANCE
+
i
+
6
7
8
3
2
1
4
3
5
1
2
5
6
4
8
7
50 - 250 OHMS
Figure 10 – 4-20 mA Output Wiring for Ground Referred Burden
2.13.2.3 D IGITAL V OLTMETER
The +/- output terminal is designed to provide +2.0 volts when the +/- 10 V output terminal is adjusted (with the
Gain and Zero pots) to be +10.0 volts (this is full scale). To achieve different scaling, adjust gains on the Digital
Panel meter (DPM).
MINIMUM METER RESISTANCE = 2000 OHMS
DIGITAL VOLT METER
0 TO 1.99 VOLT
+
8
6
5
7
3
2
4
1
3
2
4
1
8
7
6
5
Figure 11
-
Output Wiring, Damped +/- 2V Analog
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