NK TECHNOLOGIES VTR Series User manual

INSTRUCTIONS
1. Ensure correct sensor model was chosen for Input
Voltage of application.
2. Mount the sensor to a DIN rail using integrated
mounting clip on backside of transducer.
3. Connect input voltage L1 & L2 and output wiring
(24V + & – ) using 30-12 AWG copper conductors
only rated 75°C minimum. Tighten to 6 in-lbs
torque. Refer to “Output Wiring” section for loop
voltage and impedance recommendations.
Recommend 1/2 A, 600 V fast acting fuses in the
primary circuit.
VTR 1 - 420 - 24L - DIN
OUTPUT:
420 - 4-20 mA
VOLTAGE INPUT RANGE:
1 - 120 VAC
2 - 150 VAC
3 - 240 VAC
4 - 480 VAC
5 - 500 VAC
6 - 600 VAC
Special: Suffi x Y66: Range 0-50 VAC
Suffi x Y87: Range 0-400 VAC
Suffi x Y96: Range 0-300 VAC
SENSOR TYPE:
VTR - AC Voltage Transducers, True RMS Output
Model Number KeySpecifi cations
Quick “How To” Guide
CASE STYLE:
DIN - DIN rail compatible
POWER SUPPLY:
24L - Nominal 24 VDC Loop Power
3511 Charter Park Drive, San Jose, CA 95136
Phone: [phone] or 408-871-7510
Fax: [phone]
[email protected], www.nktechnologies.com 292180001 Rev 7
Know Your Power
Other NK Technologies Products Include:
AC & DC Current Transducers
AC & DC Current Operated Switches
1 & 3Power Transducers
Current & Potential Transformers (CTs & PTs)
Power Supply 24 VDC loop-powered. Use
Class 2 power supply only.
Input Range: Input 50-150 V: 73 KΩ, 240-300 V:
Impedance 146 KΩ, 400-500 V: 300 KΩ,
600 VAC: 365 KΩ
Output Signal 4–20 mA proportional;
capped at 24 mA max
Response Time 250 ms (to 90% of step change)
Accuracy 1.0% FS @ 60 Hz (25-100%
of range)
2.5% FS @ 50 Hz
Linearity < 0.5% FS
Output Loading < 500 ohm loop impedance
Isolation Voltage 2200 VAC
Frequency Range 40 Hz – 100 Hz
Case UL94 V-0 Rated
Environmental Operating Temp. Range -4 to
122°F (-20 to 50°C)
Storage Temp. Range -22 to
140°F (-30 to 60°C)
0-95% RH, Non-condensing
Pollution Degree 2
Altitude to 6561 ft (2000 meters)
Listings UL/cUL, CE
Warning! Risk of danger
Safe operation can only be guaranteed if the trans-
ducer is used for the purpose it has been designed
for and within the limits of the technical specifi ca-
tions. 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 electrical shock
When operating the transducer, certain parts of
the module may carry hazardous live voltage (e.g.
primary conductor, power supply). The transducer
should not be put into operation if the installation
is not complete.
For products intended for the EU market, the following is ap-
plicable to the CE compliance of the product:
The VTR Series comply with EN 61010-1 CAT III 600Vrms max
line-to-neutral measurement category.
VTR SERIES
AC Voltage Transducers
Ranges 120 to 600 Volts
4-20 mA True RMS Output

VTR transducers feature a slim DIN rail compatible enclo-
sure and are typically located in the same environment as
motors, contactors, heaters, pull-boxes, and other electrical
enclosures.
To mount on DIN rail: Orient transducer so that line volt-
age terminals L1 and L2 are upright/on top of unit and snap
securely onto DIN rail. To remove, insert small screwdriver
into the lower mounting hole of the spring loaded clip, and
push the handle end of the screwdriver toward the sensor
base to release the tension on the rail.
Description
Installation
Output Wiring
Connect control or monitoring wires to the sensor. Use
30-12 AWG copper wire, insulated to 75°C minimum
and tighten terminals to 6 inch-pounds torque. Be sure
the output load or loop power requirements are met (see
diagram below).
VTR Series Voltage Transducers are designed to monitor
AC voltage and detect conditions where supply voltage is
above or below normal. Detecting such conditions helps
users to avoid problems commonly associated with voltage
irregularities such as motor overheating, damage to drives
due to regeneration, loss of phase and the like.
The VTR is available with a 4-20 mA “True RMS” output
as standard, making them suitable for use in applications
where the monitored voltage is laden with harmonic current
components.
1. Transducer has no output
A. Power supply is not properly sized. Check power
supply voltage and current rating.
B. Polarity is not properly matched. Check and correct
wiring polarity.
2. Output Signal Too Low or Too High
Transducer model improperly sized for application. De-
termine the normal operating voltage of your monitored
circuit and ensure transducer selected is equal to or
slightly higher than the normal operating voltage.
3. Sensor is always at 4 mA
Monitored load is not AC or is not on. Check that the
monitored load is AC and that it is actually on.
Troubleshooting Tips
Loop Voltage Requirements:
LV = 12 V + (LR X 20 mA)
Where: LV = Min. Loop voltage
LR = Loop Resistance
500 Ω maximum impedance
Line Voltage Wiring Connection
CAUTION: TO AVOID ANY POTENTIAL FOR SHOCK OR
SAFETY HAZARD, ENSURE LINE VOLTAGE IS DISCON-
NECTED AT SOURCE BEFORE WIRING TO UNIT.
Connect input voltage to be monitored to terminals L1 and
L2 on transducer using 30-12 AWG copper wires and tighten
terminals to 6 inch-pounds torque. For multiple transducer
applications on separate phases, ensure all phase relationships
between L1 and L2 are consistent.
Fusing of the primary voltage inputs is recommended. Use
a 1/2 amp, 600 V rated fast acting fuse.
To mount using screws: Insert screws and mount to back
plane or other suitably fl at surface.
292180001 Rev 7