NK TECHNOLOGIES AT SERIES User manual

INSTRUCTIONS
1. Pop top section of sensing ring off by carefully pry-
ing clips away and lifting the section vertically.
2. Mount the sensor to a DIN rail or surface using
screws in corners if needed.
3. Place conductor inside ring and replace top section
until the clips snap firmly closed.
4. Connect output wiring.
A. Use up to 14 AWG 75/90°C copper wires.
B. Make sure output load does not exceed product
specifications.
C. Connect 24 VDC power supply and load in
series. Observe polarity.
5. Verify that the display or controller is reading the
output correctly (4mA)
6. Energize the monitored circuit.
AT & ATR -LS SERIES
AC Current Transducers
Large Split Core, 4-20mA Output
True RMS or Average Responding
AT R 10 - 420 - 24L - LS
OUTPUT:
420 - 4-20mA
RANGE
8 - 800 A
10 - 1000 A
12 - 1200 A
16 - 1600 A
SENSOR TYPE:
AT - AC current sensor, 4-20 mA output
loop powered
Model Number KeySpecifications
Quick “How To” Guide
CASE STYLE
LS- Large Split Core
Current Measurement To 0-1600A
300V CAT III
Output Signal 4-20mA, Loop Powered
Output Limit 23 mA
Accuracy 1.0% FS
Measurement True RMS or Average Responding
(See Model Number Key)
Frequency Range ATR: 10/400 Hz
AT: 50/60 Hz, Sinusoidal
Isolation Voltage 3kV (Board level)
Response Time 600 ms (to 90% of step change)
Power Supply 24VDC nominal, (12-40VDC)
Case UL 94V-0 Flammability rated
thermoplastic
Environmental -4 to 122°F (-20 to50°C)
0-95% RH non-condensing
Pollution degree 2
Altitude to 2000 meters
Overvoltage category II
Approvals Designed to meet UL508
CE Compliance soon
Input Maximums
----------MAXIMUM AMPS------------
MODEL RANGE 1 SEC 60 SEC CONT.
AT/ATR-LS All 6400A 1920 1600A
POWER SUPPLY:
24L- 24VDC Loop Powered
Measurement
R-True RMS
(Blank) - Average Responding
Know Your Power
Other NK Technologies Products Include:
AC & DC Current Transducers
AC & DC Current Operated Switches
1I& 3IPower Transducers
Current & Potential Transformers (CTs&PTs)
Caution! Risk of electric shock or per-
sonal injury
Safe operation can only be guaranteed if the
transducer is used for the purpose for which
it was designed and within the limits of the
technical specifications. When this symbol
is used, it means you should consult all
documentation to understand the nature of
potential hazards and the action required to
avoid them.
Caution! Risk of hazardous voltage
When operating the transducer, certain
parts may carry hazardous live voltage (e.
g. primary conductor, power supply). The
transducer should not be put into service if
the installation is not complete.
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Place wire or bus bar to be monitored through the sensing
aperture.
AT and ATR Series transducers work in the same environ-
ment as motors, contactors, heaters, pull-boxes, and other
electrical enclosures. They can be mounted in any posi-
tion or hung directly on wires with a wire tie. Just leave at
least one inch distance between sensor and other magnetic
devices.
Description
Installation
Output Wiring
Model Range Select
AT and ATR Series transducers feature factory calibrated
ranges. This eliminates time consuming and inaccurate
field setting of zero or span.
1. Determine the normal operating amperage of your
monitored circuit using load specifications or a test
Trouble Shooting
AT and ATR-LS Series transducers combine a current
transformer and a signal conditioner into a single pack-
age. This provides higher accuracy, lower wiring costs,
easier installation and save valuable panel space. Both
AT and ATR are available in a large split core housing
with 4-20mA output proportional to the primary AC cur-
rent. ATR Series feature a True RMS output. They are
designed for application on distorted current waveforms
such as VFD outputs.
ammeter.
2. Select the model with a range that is equal to or
slightly higher than the normal operating amperage.
1. Sensor has no output
A. Power supply is not properly sized Check power
supply voltage and current rating.
B. Polarity is reversed. Check and correct output wiring
polarity.
2. Output Signal Too Low
A. The range may be too high for current being
monitored. Exercise care when selecting the model
range.
B. The load current is not sinusoidal. Select an ATR
transducer for use with distorted waveforms.
C. Monitored current is below minimum required. Loop
the monitored wire several times through the aperture
until the “sensed” current rises above minimum.
Sensed Amps = (Actual Amps) x (Number of Loops).
Count loops on the inside of the aperture.
3. Sensor is always at 4mA
A. Monitored load is not AC or is not on. Check that
the monitored load is AC and that it is actually on.
4. Output Signal is always at 20mA
A. The range is too low for current being monitored.
Select a model with a higher range.
Connect control or monitoring wires to the sensor. Use
up to 14 AWG 75/90°C copper wire and tighten terminals
to 3.5 inch-pounds torque. Be sure the output load total
impedance does not exceed 800 ohms.
Connection Notes:
• Captive screw terminals.
•14-22 AWG solid or stranded.
•Observe Polarity
•See ordering information and label for monitored circuit
range
+
-
-
24VDC
Power
+-+
Load
(PLC, meter)
Power Supply
Minimum Power Supply = 12 VDC + Total Loop Voltage Drop
0 250 500 750 1000
32V
22V
12V
Operating
Range
Total Loop Impedance (Ohms)
LOOP
POWER
(VDC)
Use Class 2 power supply or fuse supply at 5 amps.
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