NK TECHNOLOGIES DS1-FD Series User manual

INSTRUCTIONS
1. Mount thesensor bysnapping ontoa DINrail or
attaching to a panel using the mounting holes.
2. Run the wire you are monitoring through ap-
erture.
3. Connect power & output wiring.
A. Make sure power supply matches specifications.
B. Make sure controlled load requires less than the
sensor contact capacity.
4. Adjust Setpoint
A. Turn the Coarse Adjustment fully clockwise.
B. Turn the Fine Adjustment fully counter-clockwise.
C. Energize the monitored load, and set the trip point
by turning the Coarse Adjustment slowly counter-
clockwise until the sensor trips.
D. Leave the adjustment tripped to monitor for under
current conditions, or use the Fine Adjustment to
untrip the output to detect over current conditions.
DS1-FD SERIES
DC Current Operated Switch
DS1 - SDTA - 24U - FD
Power Supply
24U 24VAC/DC
OUTPUT:
SDTA Single Pole Double Throw (SPDT or
Form C) relay, Auto Reset
SDTL Single Pole Double Throw (SPDT or
Form C) relay, Latching
SENSOR TYPE:
DS1 DC current sensing switch with range 20-400 ADC
and adjustable setpoint
Model Number KeySpecifications
Power Supply 24U =20-28 VAC/DC
Consumption Relay (SPDT) <17mA de-energized
<26mA energized
< 0.75 VA
Setpoint Ranges 20-400A (DC)
17-338A (AC, typical at 60 hertz)
Setpoint Adjust 270° Turn potentiometer (coarse)
270° Turn potentiometer (fine)
Dielectric Resistance Working Voltage to 1500 VDC
Frequency Range DC to 400 Hz
Repeatability 0.5%
Hysteresis 5% of setpoint
Sensing Aperture 1.31” (33.3 mm)
Case UL 94-V0 Flammability Rated
Output Rating & Environmental
SDTA
(Automatic Reset) SPDT (Form C) Relay
2A General Purpose @ 125 VAC
2A @ 30 VDC
SDTL
(Latching Reset) SPDT (Form C) Relay
2A General Purpose @ 125 VAC
2A @ 30 VDC
Operating and Storage -20 to 50 DegC (-4 to 122 DegF)
0-95% RH, Non Condensing
Approvals Designed For UL/cUL, CE
Quick “How To” Guide
DS1-FD Inst. Rev1, 07-11-18 P/N 393000107
80 ms max
80 ms max
80 ms max
ON Delay
5% over Setpoint
50% over Setpoint
100% over Setpoint
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 DS1-FD 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.
Housing Type
FD Solid Core, DIN or panel mtg.

DS1-FD Series areDC current operatedrelays. They operate
(relay contacts change state) when the current level through
the hole exceeds the adjustable setpoint. They accept 24
VAC or 24 VDC power. The outputs are isolated from the
input and the power supply. The sensor can be supplied
with form C relay output (-SDT ), either resetting when the
monitored current falls below the setpoint, or latching in the
tripped condition until an external button closes between the
“reset” terminals.
Description
Installation
Setpoint Adjustment
Setpoint Adjustment
DS1-FD switches have two setpoint adjustment mecha-
nisms:
1. Turn the setpoint CoarseAdjustment (CA) fully CW
to set the trip point at the maximum (400 ADC).
DO NOT OVERTURN!
2. Turn the Fine Adjustment (FA) fully CCW .
3. Slowly turn the CA CCW until the sensor trips.
4. Slowly turn FA CW until the sensor untrips.
5. The adjustment can be left at this point and the output
will change on current increase.
6. Turning the FA CCW will cause the sensor output to
trip. This setting will detect a current decrease and
the relay contacts will revert to original condition
when current falls below the set point.
7. If turning FA CW in step 4 does not allow the output to
untrip, return to step 1, and readjust using CA.
Adjustment Notes:
1. Relay output contacts are mechanical, and can be tested
with an ohmmeter if the controlled circuit is not ener-
gized.
2. If the controlled circuit is energized, testing can be
1. Sensor is always tripped
A. Current may be higher than 400 ADC.
B. The setpoint may be too low. Turn Coarse Adjust-
ment pot CW to increase setpoint.
C. Sensor output has been overloaded and contacts are
burned out. Check the output load, remembering to
include inrush on inductive loads (coils, motors, bal-
lasts).
2. Sensor will not trip
A. Unit is not powered. Check power supply and power
wiring, confirm Green LED is on.
B. The current may be lower than the 20 amp minimum
needed to operate the sensor output. Loop the con-
ductor through the sensing aperture twice or more to
increase the current “seen” by the sensor.
C. The setpoint may be too high. Turn pot CCW to
decrease setpoint.
D. Switch has been overloaded and contacts are burned
out. Check the output load, remembering to include
inrush on inductive loads (coils, motors, ballasts).
done with a volt meter. A closed contact will show no
potential and an open contact will show full controlled
circuit voltage.
3. We recommend adjusting setpoint to allow for normal
voltage variations.
5. Hysteresis (deadband) is 5% of the setpoint. During set
point adjustment, the hysteresis will be tighter than in
normal operation to make adjustment easier.
6. When adjusting the latching version models, remember
to short between terminals 6 and 7 to allow the output
to reset.
Trouble Shooting
Power Wiring
Connect 24VAC or DC powertoTerminals 1 and2. Tighten
to 5-7 In-Lb torque. The connection is not polarity sensitive.
The Green LED will light when the sensor is energized.
Output Wiring
Connect control or monitoring wires to the sensor. Use
up to 14-22 AWG copper wire and tighten terminals to 5-7
In-Lb torque. Be sure the output load does not exceed the
relay contact rating. Note that the NO contact closes on
current rise, and the NC contact opens on current rise.
Mount the sensor to a DIN rail or secure to a panel with
screws through the mounting holes. Run wire to be moni-
tored through opening in the sensor.
DS1-FD switches 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 sensor and other magnetic devices.
1234
Power
Supply
5
NO
NC
Coarse
Fine
12345G
POWER
R
STATUS
COARSE
FINE
234
Power
Supply
5
NO
NC
Coarse
Fine
G
POWER
R
STATUS
COARSE
FINE
1234567
EXTERNAL
RESET
Connection-Auto Reset Connection-Latching
Note: reset is not isolated from sensor
power. Do Not add voltage to the reset
button, shorting action only
MONITORED
CIRCUITAMPS OUTPUT CONTACT RED STATUS
LED
. NO NC
None or < 20ADC OPEN CLOSED OFF
Lower Than Set Point OPEN CLOSED OFF
Higher Than Set Point CLOSED OPEN ON
Contact and LED Action:
DS1-FD Inst. Rev1, 07-11-18 P/N 393000107