NK TECHNOLOGIES VTU Series User manual

1. Ensure correct sensor model was chosen for Input Volt-
age of application.
2. Mount the sensor to aDIN rail usingintegrated mounting
clip on backside of transducer or secure using the tabs
in each corner.
3. Connect monitored voltage (2) & (1) using 22-16AWG
copper wires insulated to 75/90°. Lift the orange clip
on the terminal, insert wire and allow it to clamp on the
stripped end of the wire.
Refer to “Output Wiring” section for voltage and imped-
ance recommendations.
4. Connect 24VAC or DC power supply fused to 1 amp to
term. 3-4. Use twisted pair for CE compliance.
5. Connect output to the load using terminal 6 for the positive
signal, and terminal 5 to common or ground.
6. Energize primary circuit and sensor power.
VTU 10 - 420 - 24U - OS
OUTPUT:
420 - 4-20mA
005 - 0-5VDC
010 - 0-10VDC
VOLTAGE INPUT RANGE:
8 - 800V
10 - 1000V
12 - 1200V
SENSOR TYPE:
VTU - AC/DC Voltage Transducers
Model Number KeySpecifications
Quick “How To” Guide
CASE STYLE:
OS - DIN rail compatible
POWER SUPPLY:
24U - Nominal 24 VAC/DC
3511 Charter Park Drive, San Jose, CA 95136
800-959-4014 or 408-871-7510 Phone
408-871-7515 FAX
[email protected], www.nktechnologies.com VTU Instruction Sheet Rev 1 04/16 P/N 292180014
Know Your Power
Other NK Technologies Products Include:
AC & DC Current Transducers
AC & DC Current Operated Switches
1φ& 3φ Power Transducers
Current & Potential Transformers (CTs & PTs)
Power Supply 24VAC/DC External Power
(22-26VAC or DC), <4VA
Power supply is isolated from
monitored circuit and output signal
Use class 2 power supply
Voltage Measurement 0-800, 1000 or 1200 VAC or DC
Output 4–20mA (capped at 24mAmax)
0-5 VDC
0-10 VDC
Response Time 100 ms (to 90% value)
Accuracy < 1% Full Scale
Linearity < 0.5%
Loading 4-20mA: < 400 ohms
0-5/0-10VDC >100 ohms
Isolation Voltage 5000 Volts
Frequency Range 0-400 Hertz
Operating Temp. -20°C to 50°C
(surrounding sensor)
Enclosure UL94 V0 Rated
Environmental -4 to 122 ° F
(-20 to 50° C),0–95% RH
Pollution Degree 2
Altitude to 2000 meters
Listings Designed for UL/cUL, CE
Warning! Risk of danger
Safe operation can only be guaranteed if the
transducer is used for the purpose for which is
was designed and within the limits of the techni-
cal specifications. 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 may
carry hazardous live voltage (e.g. primary con-
ductors, power supply). The transducer should
not be put into operation if the installation is not
complete.
VTU SERIES
AC/DC Voltage Transducers
Ranges 800, 1000 and 1200 Volts
4-20mA, 0-5/10VDC Outputs
INSTRUCTIONS

VTU transducers feature a DIN rail compatible enclosure
and are typically located in the same environment as mo-
tors, contactors, heaters, pull-boxes, and other electrical
enclosures.
To mount on DIN rail: Orient transducer so that line volt-
age terminals (1) and (2) are upright/on top of unit and snap
securely onto DIN rail. To remove, insert small screwdriver
into the slots in the lower corners and pry the two mounting
springs down until unit dislodges from DIN rail.
To mount using screws: Insert screws and mount to back
plane or other suitably flat surface.
Description
Installation
Output Wiring
VTU SeriesVoltage Transducers are designed to monitorAC
or DC 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, brownouts and
conductor failure or poor connections.TheVTU isavailable
with 4-20mA, 0-5 or 0-10 VDC output options.
1. Transducer has no output
A. Power supply is not properly sized. Check power supply
voltage and output rating. Each transducer requires less
than 4VA to operate.
B. Green LED should be on when the power supply is en-
ergized.
2. Output Signal Too Low or Too High
A. Transducer model improperly sized for application. Deter-
mine the normal operating voltage of your monitored circuit
and ensure transducer selected is equal to or slightly higher
than the normal operating voltage.
B. Output impedance is higher or lower than needed. Check the
settings of the controller or meter.
3. Sensor is always at 4mA (or zero voltage)
Monitored circuit is not on. Check that the monitored circuit
is actually switched on, and that any fuses used are intact.
Check the power supply if the sensor is designed for voltage
output and the output is reading zero.
4. Sensor is always at 20mA (or 5/10VDC)
Monitored voltage is higher than transducer range. Select a
higher range product.
Troubleshooting Tips
Monitored Voltage Wiring Connection
CAUTION: TO AVOID ANY POTENTIAL FOR SHOCK
OR SAFETY HAZARD, ENSURE MONITORED VOLT-
AGE IS DISCONNECTED AT SOURCE BEFORE WIR-
ING TO UNIT.
Connect voltage to be monitored to terminals (1) and (2)
on transducer using up to 16 AWG copper wires. Lift the
orange clip, insert the stripped wire and release the clip.
Proper torque will be applied.
(mA)
(% FS)
Transducer Output vs. Monitored Voltage
0.0 100.0
50.0
Monitored Voltage
POWER SUPPLY
OUTPUT SIGNAL
4-20mA
0-5VDC
0-10VDC
(1)
(2)
(6)(5)(4)
(3)
Monitored Voltage
GROUND
GREEN LED
POWER ON
Use twisted pair for power supply conductors for full com-
pliance with CE directives.
Note: Voltage output will be linear in the same manner, with
zero at zero monitored voltage and 5 or 10 VDC at the full range
measured voltage.
Connect output signal wires to the sensor. Use up to 14 AWG
copper wire insulated to 75/90°C and tighten terminals 3-6
to7 inch-pounds torque.
5/10VDC
20 mA
0 VDC
4 mA
Output