NK TECHNOLOGIES DS1-FD Series Instructions

Specifi cations
Power Supply 24U = 20-28 VAC/VDC
(24 V nominal)
Power Consumption < 2 VA
Setpoint Range 20-400 A (DC)
17-338 A (AC, typical at 60 Hz)
Setpoint Adjust 270° Turn potentiometer (coarse)
270° Turn potentiometer (fi ne)
Isolation Voltage UL listed to 1250 VAC
Frequency Range DC to 400 Hz
Repeatability 0.5%
Hysteresis 5% of setpoint
Sensing Aperture 1.30" (33.0 mm)
Output Rating & Environmental
SDTA
(Automatic Reset) SPDT (Form C) Relay
2 A @ 125 VAC Resistive
2 A @ 30 VDC Resistive
SDTL
(Latching Reset) SPDT (Form C) Relay
2 A @ 125 VAC Resistive
2 A @ 30 VDC Resistive
Environmental 20 to 50°C (-4 to 122°F)
0-95% RH, Non-condensing
Pollution Degree 2
Altitude to 6561 ft (2000 meters)
Listings UL/cUL
Model Number Key
DS1 - SDTA - 24U - FD
Case Style:
FD - Solid-Core, DIN or panel mtg.
Power Supply:
24U - 24 VAC/VDC
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
Switching Response Time
ON Delay
80 ms max
5% over Setpoint
80 ms max
50% over Setpoint
80 ms max
100% over Setpoint
3511 Charter Park Drive, San Jose, CA 95136
Phone: 800-959-4014 or 408-871-7510
Fax: 408-871-7515
sales@nktechnologies.com, www.nktechnologies.com
INSTRUCTIONS
DS1-FD SERIES
DC Current Operated Switch
Quick "How To" Guide
1. Mount the sensor by snapping onto a DIN rail or attach-
ing to a panel using the mounting holes.
2. Run the wire you are monitoring through aperture.
3. Connect power & output wiring.
A. Use 30-12 AWG 75°C minimum copper conductors
only and tighten terminals to 5-7 lbs torque.
B. Make sure power supply matches specifi cations.
C. 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.
393000107 Rev 2