NK TECHNOLOGIES AT, ATR-LS Instructions Manual

Model Number KeySpecifi cations

Buy: www.ValinOnline.com | Phone [phone] | Email: [e-mail]

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

Caution! Risk of electric shock or per­sonal 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 specifi cations. 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.

AT R 10 - 420 - 24L - LS

CASE STYLE

LS- Large Split Core

POWER SUPPLY:

24L- 24VDC Loop Powered

OUTPUT:

420 - 4-20mA

RANGE

8 - 800 A
10 - 1000 A
12 - 1200 A
16 - 1600 A

Measurement

R- True RMS
(Blank) - Average Responding

SENSOR TYPE:

AT - AC current sensor, 4-20 mA output

loop powered

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)

INSTRUCTIONS

AT & ATR -LS SERIES

AC Current Transducers

Large Split Core, 4-20mA Output

True RMS or Average Responding

Quick “How To” Guide

1. Pop top section of sensing ring off by carefully pry­ing 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 fi rmly 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

specifi cations.

C. Connect 24 VDC power supply and load in

series. Observe polarity.

Input Maximums

----------MAXIMUM AMPS------------

MODEL RANGE 1 SEC 60 SEC CONT.

AT/ATR-LS All 6400A 1920 1600A

5. Verify that the display or controller is reading the
output correctly (4mA)

6. Energize the monitored circuit.

Description

Buy: www.ValinOnline.com | Phone [phone] | Email: [e-mail]

Output Wiring

AT and ATR-LS Series transducers combine a current
transformer and a signal conditioner into a single pack­age. 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 cur­rent. ATR Series feature a True RMS output. They are
designed for application on distorted current waveforms
such as VFD outputs.

Installation

Place wire or bus bar to be monitored through the sensing
aperture.

AT and ATR Series transducers work in the same environ­ment as motors, contactors, heaters, pull-boxes, and other
electrical enclosures. They can be mounted in any posi­tion or hung directly on wires with a wire tie. Just leave at
least one inch distance between sensor and other magnetic
devices.

Power Supply

Minimum Power Supply = 12 VDC + Total Loop Voltage Drop

32V

LOOP

POWER

(VDC)

22V

12V

0 250 500 750 1000

Total Loop Impedance (Ohms)

Operating

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

Model Range Select

AT and ATR Series transducers feature factory calibrated
ranges. This eliminates time consuming and inaccurate
fi eld setting of zero or span.

1. Determine the normal operating amperage of your

monitored circuit using load specifi cations or a test

Trouble Shooting

+

24VDC
Power

+

-

+

-

Load
(PLC, meter)

-

ammeter.

2. Select the model with a range that is equal to or
slightly higher than the normal operating amperage.

Use Class 2 power supply or fuse supply at 5 amps.

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 wir e several times through the apertur e
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.