Troubleshooting
1. Transducer has no output.
A. Power supply is not properly sized.
Check the power supply voltage and output rating. Each
transducer requires less than 2VA to operate.
B. Output polarity is not properly matched.
Check and correct wiring polarity.
2. Output signal too low or too high.
Transducer model improperly sized for application.
Determine the normal operating voltage of your monitored
circuit and ensure transducer selected is equal to or slighly
higher than the normal operating voltage.
3. Transducer output is always at 4mA.
A. Primary circuit is not on.
Check that the monitored circuit is actually energized.
4. Transducer output is always at 20mA.
Voltage is higher than transducer range.
Select a higher range product.
Description
VADT Series Voltage Transducers are designed to monitor AC
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.
Installation
VADT transducers feature a 35mm wide DIN rail-compatible
enclosure 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 voltage
terminals L1 and L2 are upright/on top of unit and snap
securely onto DIN rail. To remove, insert a 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.
Output Wiring
Connect control or monitoring wires to the sensor terminals
1 and 2. Use 22-12 AWG copper wire insulated to 75/90°C
and tighten terminals to , 6 in-lbs torque.
Observe polarity, terminal 1 is the postiive output, 2 is
negative.
To mount using screws:
Insert screws and mount to
backplane or other suitably flat surface.
Monitored Voltage Wiring Connection
CAUTION: To avoid any potential for shock
or safety hazard, ensure line voltage is
disconnected at source before wiring to unit.
Connect input voltage to be monitored to terminals (5) and
(6) on transducer using 30-12 AWG copper wires and tighten
terminals 5-7 inch pounds torque.
Do not connect the power supply and signal together.
There is no isolation between power and signal.
(mA
)
(% FS)
Transducer Output vs. Input Voltage
0.0
100.0
50.0
Input Voltage
Cu
rrent Output
VADT Series
+
AC/DC Voltage (primary)
(5)
(6)
+
-
Load
(PLC, meter,etc.)
24 VAC/DC
Power Supply
(1) (2) (3) (4)
