NK TECHNOLOGIES AG1 Series User manual

INSTRUCTIONS
1. Run all current carrying conductors through detector
window.
A. Use an auxiliary CT if conductors do not fi t. Consult
Factory for CT selection.
2. Mount the detector to a surface if needed.
3. Connect output & power wiring.
A. Use 30-10 AWG copper conductors rated 75°C
minimum. Tighten to 5-7 inch-pounds.
B. Make sure power and load matches those shown on
the sensor’s label.
4. Test.
A. Pressing the “TEST” button tests the detectors
internal circuits. CAUTION: The output and any
connected loads will switch!
Model Number KeySpecifi cations
Quick “How To” Guide
Power Supply Notes
AG1, 2 & 3 SERIES
Ground Fault Detectors
with Relay Outputs, Auto-Reset
490100001 Rev 9
Power Supply 120 VAC (66-132 volts, 50-60 Hz)
2.5 VA consumption
24 VAC or VDC (19-29 volts)
2.5 VA consumption
Green LED = Power supply energized
Setpoint Range AG1 Series: 5-100 mA fi eld adjustable
AG2 Series: 80-950 mA fi eld adjustable
AG3 Series: Tri-Set, 5, 10 & 30 mA,
jumper select (defaults to 5 mA when
jumper is removed)
Isolation Voltage Up to 1500 VAC
Frequency Range 50-60 Hz (monitored circuit)
Output Rating Relay output: 1.0 A @120 VAC, 2 A @
30 VDC
Response Time 150 ms @ 5% over setpoint
100 ms @ 50% over setpoint
50 ms @ 500% over setpoint
Dimensions 2.98”H x 3.86”W x 1.45”D
(76 x 98 x 37 mm)
Case aperture 0.75” (19 mm) diameter
Case UL94 V-0 Flammability rated
Environmental -4 to 122°F (-20 to 50°C)
0-95% RH, Non-condensing
Pollution Degree 2
Altitude to 6561 ft (2000 meters)
Listings UR/cUR, CE
System Grounding
All low-current Ground-Fault Detectors are sensitive devices
that require reasonable care in system design to avoid false
trips caused by high electrical noise levels. Keep in mind
that the best way to reduce noise in a system is to suppress
it at its source.
1. Keep the detector power isolated from noisy circuits.
2. Do not power the detector with the same circuit that
switches contactors or other high current, inductive loads.
Good design practice and code require that all AC power
systems be grounded. AG Series detectors are designed to
work on grounded AC power systems. They may not operate
properly on ungrounded systems.
For products intended for the EU market, the following is applicable
to the CE compliance of the product:
The sensor may comply with EN 61010-1 CAT III 600 V max line-to-
neutral measurement category. If insulated cable is used for the primary
circuit, the voltage rating of the measurement category can be improved
according to the characteristics given by the cable manufacturer. A fuse
rated 5 A max shall be placed in series with the main input power termi-
nal. Use twisted pair for output connection.
De-energize power before changing setpoint jumper position.
Warning! Risk of Danger
Safe operation can only be guaranteed if the sensor is used for the purpose it
was designed for and within limits of the technical specifi cations. When this
symbol is used, it means you must consult all documentation to understand
the nature of potential hazards and the action required to avoid them.
Warning! Risk of Shock
When operating the senor certain parts may carry hazardous live voltage
(e.g. primary conductors, power supply). The sensor should not be put into
operation if the installation is not complete.
AG 1 - SDT1 - 120 - ENE - 005 - N
OUTPUT TYPE:
SDT1 - SPDT Relay (Form C)
1 A @ 120 VAC, 2 A @ 30 VDC
POWER SUPPLY:
24U - 24 VAC/VDC
120 - 120 VAC
SETPOINT RANGE:
1 - 5-100 mA, Adjustable
2 - 80-950 mA, Adjustable
3 - Tri-Set, 5, 10 & 30 mA, Jumper Select
AG Series Ground Fault Detector
OPTIONS:
ENE - Normally Energized
DEN - Normally De-energized
SETPOINT:
005 to 950 - Factory Adjusted
Setpoint in mA (spec-
ify when ordering)
TR3 - Tri-Set, 5, 10 & 30 mA,
Jumper Select
NOISE IMMUNITY:
N - Noise Immunity
None (Blank)
3511 Charter Park Drive, San Jose, CA 95136
Phone: [phone] oe 408-871-7510
Fax: [phone]
[email protected], www.nktechnologies.com

Normally Energized Models (-ENE) Detects Ground Faults and loss of control power
CONTROL POWER APPLIED
NO POWER No Fault Fault Detected
Output Output LED Output LED Output LED
N.C. Normally Closed CLOSED Off OPEN OFF CLOSED ON
N.O. Normally Open OPEN Off CLOSED OFF OPEN ON
Normally De-Energized Models (-DEN) Detects Ground Faults only.
CONTROL POWER APPLIED
NO POWER No Fault Fault Detected
Output Output LED Output LED Output LED
N.C. Normally Closed CLOSED Off CLOSED OFF OPEN ON
N.O. Normally Open OPEN Off OPEN OFF CLOSED ON
Description
Operation
Principal of Operation
Under normal conditions, the current in one wire of a two
wire load is equal in strength but opposite in sign to the cur-
rent in the other wire. The two wires create magnetic fi elds
that cancel, a condition known as “Zero Sum Current”. If
any current leaks to ground (Ground Fault), the two currents
become unbalanced and there is a net resulting magnetic
fi eld. The AG detector detects this minute fi eld and changes
the output state. This concept extends to three phase systems
such as 3 wire Delta and to 4 wire Wye.
AG Series detectors work in the same environment as mo-
tors, 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 detector and other magnetic devices.
Run all current carrying conductors through the detector
apeture in the same direction. (See “Principal of Operation”)
Connect power wiring to the detector. Be sure that the power
supply matches the power rating on the detector label. Use
30-10 AWG copper conductors and tighten terminals to 5-7
inch-pounds torque.
Connect output wiring to the detector. Be sure that the
output load is less than or equal to the output rating on the
Installation & Wiring
detector label. Use 30-10 AWG copper conductors and
tighten terminals to 5-7 inch-pounds torque.
To test operation, gently press the
TEST button. This simulates a
fault and tests the internal switch-
ing circuits. You should observe
the following operation.
CAUTION: Any circuit con-
nected to the detector will be
operated.
Power Output
Control Power
Match Detector
Rating
(See Label)
AG3 Move jumper to select
setpoint.
Load
Contactor, Relay, Shunt Trip
Breaker, etc.
Do not exceed Rating (See
Label) Output Power
Match Detector Rating
(3-4 Normally Open,
4-5 Normally Closed)
1A@120 VAC or 2 A
30 VDC Maximum
TEST
Setpoint Adjustment
AG Series detectors monitor all current carrying wires in
single or three phase systems to detect ground faults. They
provide a contact output that can operate relays, contactors
or signal automation systems.
AG1 & AG2 ONLY series detectors are factory calibrated
to trip at the setpoint specifi ed at the time order. We highly
recommend leaving this factory calibrated setpoint alone.
If you must change the factory setpoint, follow these steps:
A. Setup
Connect control power and output circuits. Run a conduc-
tor through the aperture with current equal to your desired
setpoint.
B. Adjust Setpoint to Maximum
Remove the Setpoint Cover. Turn the adjustment pot 5
revolutions CCW (Counter Clockwise) to the maximum
(least sensitive) setpoint. The Status LED should be OFF.
The adjustment pot has a slip clutch so you cannot feel or
damage the end point.
C. Dial in new Setpoint
Turn the pot slowly CW (Clockwise) until the LED turns
ON. The detector is now adjusted to trip at the current that
is passing through the aperture. Reset the detector.
D. Relabel Detector
Relabel the detector with the new setpoint. Use a label maker
or tape with a permanent marker.
AG3 - Move the jumper to the desired setpoint as shown
on the label.
1 2 34 5
490100001 Rev 9