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 22-14 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!
AG 1 - NCR1 - 120 - LA - 005 - N
Model Number KeySpecifi cations
Know Your Power Quick “How To” Guide
AG1, 2 & 3 SERIES
Ground Fault Detectors
with Latching Relay Outputs
490050006 Rev 6
OUTPUT TYPE:
NOR1 - Normally Open (Form A)
NCR1 - Normally Closed (Form B)
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:
LA - Latching
SETPOINT:
005 to 950 - Factory Adjusted
Setpoint in mA (specify
when ordering)
TR3 - Tri-Set, 5, 10 & 30 mA,
Jumper Select
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
Isolation Voltage Up to 1500 VAC
Frequency Range 50-400 Hz (monitored circuit)
Output Rating Latching electromechanical relay
1.0 A @ 120 VAC, 2 A @ 30 VDC maximum
NOR latches closed upon sensed fault current
NCR latches open upon sensed fault current
Status (Red) LED = Relay has operated
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
3511 Charter Park Drive, San Jose, CA 95136
Phone: [phone] oe 408-871-7510
Fax: [phone]
[email protected], www.nktechnologies.com
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.
Power Supply Notes
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.
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.
NOISE IMMUNITY:
N - Noise Immunity
None (Blank)
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.

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 opening in
the detector. (See “Principal of Operation”) Be Sure all
wires are oriented so current fl ows in the same direction.
Installation & Wiring
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.
Wiring
Use 22-14 AWG copper conductors and tighten terminals
to 5-7 inch-pounds torque.
Power
Connect power wiring to Terminals 1 & 2. Be sure that
the power supply matches the power rating on the detec-
tor label.
Output
Connect output wiring to Terminals 3 & 4.
Reset Switch
Connect a momentary dry contact to the reset terminals
5 & 6. Limit wire run to 200’ of 18 AWG or larger wire.
Momentary Reset
The detector will not work properly if the reset terminals
are closed (shorted) continuously. Only close the reset
terminals momentarily.
Parallel Reset Connection
Multiple detectors may be connected to the same reset switch
in parallel. Only the detectors that have detected a fault and
have latched will be reset. A detector will not reset unless
the fault has dropped below setpoint.
AG Series Latching Ground fault detectors operate in one of
two states: Reset or Latched. If control power is removed,
the detector remains in it’s last state (latched or reset).
Reset
The detector has not detected a fault and the output is in
the “normal” position.
For -NOR1 suffi x, the contact is normally open in the reset
condition.
For -NCR1 suffi x, the contact is normally closed in the
reset condition.
Latched
Upon detecting a fault or when the TEST switch is pressed,
the output will switch and “latch”. The output will remain
latched until the ground fault is removed and the output is
reset by a momentary dry contact on Terminals 5 & 6. Also,
cycling power to the sensor will reset the output.
Testing
To test operation, gently press the TEST button. This simu-
lates a fault and tests the internal switching circuits. After
the test is complete, reset the detector with a momentary
dry contact on Terminals 5 & 6. CAUTION: Any circuit
connected to the detector will be operated.
Setpoint adjustment, CW to adjust higher located
under label (AG1 & 2 only)
Test Button (Activates
output relay)
Red Status LED (On when
tripped)
Green Power
LED (On when
powered) G R
Power Supply
Input (1&2)
Output External Reset
Button (5&6)
When used with an external CT, the detector will be set
to trip at a point much lower than without the CT. This
setpoint adjustment should be done with the load passing
through the CT in that application.
Single Phase (Phase
& Neutral or Phase to
Phase)
3 Phase Delta (Include
neutral if the load uses
neutral)
3 Phase Wye (Include
neutral if load uses
neutral)
3 Phase Load, using an auxiliary Current Transformer.
Contact factory for details.
Field Setpoint Adjustment
While not as precise as having it set at the factory, the set
point can be adjusted in the fi eld through use of the small
potentiometer located beneath the label to the right of the
red LED (status). Though not recommended, if a fi eld
adjustment of setpoint is desired, the recommended steps
are as follows:
1. Develop a load of the magnitude at which you want
the detector to trip; e.g., a 4000 ohm resistor at 120 VAC
should provide a load of 30 mA while 4 watt “night light”
bulb would create a load of approximately 33.33 mA.
2. With the load energized and passing through the sens-
ing aperture, turn the potentiometer counterclockwise
(CCW) until the detector trips. Then turn the pot back
(CW) one eighth of a turn.
490050006 Rev 6