NK TECHNOLOGIES DS3 Series User manual

INSTRUCTIONS
1. Run the wire you are monitoring through ap-
erture.
2. Mount the sensor.
3. Connect power & output wiring.
A. Make sure power supply matches specifications.
B. Make sure output load matches the output shown
on the sensors’label.
4. Adjust Setpoint
A. Chose correct range by positioning the Range
Jumper
B. Use the potentiometer to adjust the setpoint.
DS3 SERIES
DC Current Operated Switch
DS3 - SDT - 24U
Power Supply
24U 24VAC/DC
12U 12VAC/DC
OUTPUT:
NOU Normally Open Solid State Switch, 0.15A
@ 240 VAC/VDC
SDT Single Pole Double Throw (SPDT or
Form C) relay
SENSOR TYPE:
DS3 DC current sensing switch with 3 jumper selectable
range and adjustable setpoint
Model Number KeySpecifications
Power 24U =15-28 VAC/DC
12U =11.4-20 VAC/DC
Consumption Relay (SDT) <20mA de-energized
<133mA energized
Solid State <20mA de-energized
<90mA energized
Setpoint Ranges (DC) 2-20A, 10-50A, 20-100A
(AC) 2-17, 10-41, 20-80A
Setpoint Adjust 11 Turn potentiometer
Isolation Voltage 3KV
Frequency Range DC to 400 Hz
Repeatability 0.5%
Hysteresis 5% of setpoint
Sensing Aperture 0.75” (19mm)
Case UL 94-V0 Flammability Rated
Output Rating & Environmental
NOU Isolated Solid State Switch
0.15A @ 240 VAC/DC
Off State Leakage NONE
Operating Temp. -20 to 50°C(-4 to 122°F)
Storage Temp. -30 to 60°C (-22 to 140°F)
0-95% RH, Non Condensing
SDT SPDT (Form C) Relay
5A General Purpose @ 240 VAC
5A @ 30 VDC
Operating and Storage -20 to 50°C (-4 to 122°F)
0-95% RH, Non Condensing
Approvals UL/cUL, CE
Ranges & Maximum Amps
RANGE
SOLID CORE
2-20 A
10-50 A
20-100 A
RANGE
JUMPER
LOW
MID
HIGH
MAX
CONTINUOUS
No limit
MAX
5 SEC.
No limit
Quick “How To” Guide
DS3 Inst. Rev13, 08/18 P/N 393000103
80 ms max
60 ms max
60 ms max
60 ms max
ALL Ranges
ON Delay
5% over Setpoint
50% over Setpoint
100% over Setpoint
OFF Delay
Switching Response Time
3511 Charter Park Drive, San Jose, CA 95136
800-959-4014 or [phone] Phone
[phone] FAX
[email protected], www.nktechnologies.com
Warning! Risk of Danger
Safe operation can only be guaranteed if the
current switch is used for the purpose it has
been designed for and within the limits of the
technical specification. When this symbol is
used, it means you must consult all documen-
tation to understand the nature of potential
hazards and the action required to avoid them.
Warning! Risk of Shock
When operating the current switch, certain
parts of the module may carry hazardous live
voltage (e.g. primary conductor, controlled
load). The switch should not be put into op-
eration if the installation is not complete.
For products intended for the EU market, the following is
applicable to the CE compliance of the product:
The DS3 series comply with EN 61010-1 CAT III 300Vrms
max. line-to-neutral measurement category. If insulated cable is
used for the primary circuit, the voltage rating of the measure-
ment category can be improved according to the insulation
characteristics given by the cable manufacturer.

DS3 Series are DC current operated switches. They operate
(switch) when the current level through the hole exceeds the
adjustable setpoint. They accept 24VAC or 24VDC power.
The outputs areisolated from the input andthe power supply.
The sensor can be supplied with solid-state output (-NOU)
or with form C relay output (-SDT ).
Run wire to be monitored through opening in the sensor.
DS3switches work in the sameenvironmentas motors, con-
tactors, 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.
Description
Installation
Setpoint Adjustment
Range & Setpoint
DS3 switches have two setpoint adjustment mechanisms:
1. Select the setpoint RANGE with the Range Jumper.
2. Fine tune the SETPOINT with the 11 turn potentiom-
eter (pot).
The 11 turn pot is shipped from the factory set fully counter
clockwise (CCW) to the lowest setpoint. Turning the pot
clockwise (CW) will increase the setpoint. The pot has a
slip-clutch to prevent damage at either end of its rotation.
To determine where theadjustment is, turn the pot atleast 11
times CCW. This will return it to the minimum setpoint.
Adjustment Notes:
1. NOU output contacts aresolid-state. Check output status
by applying a small load and reading the voltage drop
across the contacts. Anohmmeterwillgivemisleading
results.SDT output contacts are mechanical, and can be
tested with an ohmmeter.
2. We recommend adjusting setpoint to allow for normal
voltage variations.
3. Adaptive Hysteresis (deadband) is 5% of the setpoint.
This allows sensitivity at low setpoints while eliminating
dithering and output chattering at high setpoints.
Output LED
MONITORED
AMPS
OPEN
OPEN
CLOSED
CLOSED
CLOSED
OPEN
OUTPUT TYPE
N.O. N.C.
OFF
OFF
ON
None or below range
Below trip level
Above trip level
1. Sensor is always tripped
A. The jumper may be set in a range that is too low for
current being monitored. Move jumper to the correct
range.
B. The setpoint maybetoolow. Turn pot CWto increase
setpoint.
C. Switch has been overloaded and contacts are burned
out. Check the output load, remembering to include
inrush on inductive loads (coils, motors, ballasts)
Typical Adjustment
1. Make sure all wiring is correct, all terminals are tight and
that power is on (green power LED)
2. Move the jumper to the desired range. Turn the pot to
minimum setpoint (11 turns CCW).
3. Have normal operating current running through sen-
sor. The output should be tripped and red output LED
“ON”.
3. Turn the pot CW until the unit un-trips. This is indicated
by the LED going off and by the output switching.
4. Now turn the pot CCW slowly until the unit trips again.
It now set at the current level being monitored.
A. To Set UNDERLOAD - Turn the pot about 1/8 turn
further CCW.
B. To Set OVERLOAD - Turn the pot about 1/8 turn
further CW.
2. Sensor will not trip
A. Unit is not powered. Check power supply and power
wiring.
B. The jumper may be set in a range that is too high for
current being monitored. Move jumper to the correct
range.
B. The setpoint may be too high. Turn pot CCW to
decrease setpoint.
C. Switch has been overloaded and contacts are burned
out. Check the output load, remembering to include
inrush on inductive loads (coils, motors, ballasts).
Trouble Shooting
Power Wiring
Connect 24 VAC or 24 VDC (or 12 Volts depending on the
model) power to Terminals 1 and 2. Tighten to 4.5 In-Lb
torque. The connection is not polarity sensitive. Terminals
are removable to make wiring easier. Be sure to seat the
terminal properly in the location marked “Power”
Output Wiring
Connect control or monitoring wires to the sensor. Use
up to 12-22 AWG copper wire and tighten terminals to 4.5
In-Lb torque. Be sure the output load does not exceed the
switch rating.
Incandescent lamps can have “Cold Filament Inrush” cur-
rent of up to 10 times their rated amperage. Use caution
when switching lamps, especially with solid state output
sensors.
3 4
1 2
Power 3 4 5
G R
R
Partial View “-NOU”
Models
Isolated Solid State Output
(Shown De-Energized)
Power Supply
12 or 24VAC/DC
Isolated Relay Output
(Shown De-Energized)
Setpoint
- +
Top View “-SDT”
Models