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The 3ACT/3ACTR Series current transducers are intended to
monitor current of three phase loads. They provide an analog
signal proportional to the current in each of the three phases,
and another which will be proportional to the average of the
three phase currents. The transducer can be mounted on a
back panel using screws through the mounting holes in the
base or snapped onto a 35mm DIN rail. Each model can be
set for three current measurement ranges.
Wiring
Power Supply
Connect power supply to transducer as shown in the wiring
diagram. Use 75/90°C rated copper wire. Tighten terminals to
5-7 inch-pounds torque. Use a Class 2 power limited source
fused to limit power to a maximum of 100 VA.
Output Signal
Observe polarity and connect each 4-20 mA output signal to
controller or display using 75/90°C rated copper wire. Tighten
the terminals on the transducer to 5-7 in-lbs torque. Confirm
that the connected load impedance is less than 500 ohms.
Monitored Circuit
Each of the three phases passes through the three windows
of the top section. All conductors should pass through the
sensor in the same direction (from the front or the back) for
appearance, but not required for accuracy or reliability. If the
phases use multiple conductors, all wires of one phase must
pass through the same sensing window or aperture.
The transducer is designed to monitor circuits, whether the
conductor is insulated or bare. Each aperture has an inside
diameter of 0.74" (18.8 mm), allowing 4/0 THHN (120 mm²)
to pass through easily. Centering the conductor in the aperture
is not necessary.
Wiring Schematic Drawing
Note: Power supply and output signal ARE NOT isolated. Do not connect the negative ter-
minals to a common point.
PLC,
Controller, etc.
-
4-20 mA
+
Outputs
A
B
C
Average
-
-
-
+
+
+
1 2
3 4
5 6
NC NO
A
B
LOW MID HIGH
10
RANGE
POWER
SELECTION
NO POLARITY
SWITCH
MONITORED CIRCUIT CONDUCTORS
Top View
Troubleshooting
1. Sensor has no output.
A. Power supply is not energized or connected to the transducer.
Check voltage at terminals 9 and 10. There is no isolation
between the power and the output signals.
B. The monitored circuit is not energized or drawing current.
Check that the monitored circuit is energized.
C. Polarity is not properly matched.
The output signals are polarity sensitive, and the result
would be no signal to the controller or whatever is reading
-
+
the transducer outputs.
7 8
2. Output signal too low.
C
A. The transducer range may be too high to read the monitored
circuit current.
Select a lower range using the Range Selection Switch, use
9
a model with a lower range, or loop each conductor through
the sensing windows to increase the current through each
aperture.
B. Power supply may not have enough capacity to operate the
transducer outputs.
Use a power supply with at least 6VA available to operate
the transducer.
3. Outputs are always at the minimum (4mA).
The monitored load is not energized or is not AC.
Be sure that the monitored circuit is AC (3ACT 50/60 Hz,
3ACTR 30 to 100 hertz).
4. Outputs are always at the maximum (20mA).
The monitored load is drawing more current than the transducer
range.
Select a model with a higher range, or set the range selection
to a higher range. Be very careful when selecting the model
to suit the application. Check the range selection slide
switch. Check the actual current used with a hand-held
ammeter and set the range accordingly.