Page 2
WIRING
The transmitter has standard screw block connectors and easy wire access to facilitate wiring. It is
recommended that shielded twisted pair wiring at least 22 AWG be used for all connections and that the
device wires not be run in the same conduit with wiring used to supply inductive loads such as motors.
Disconnect the power supply before making any connections to prevent electrical shock or equipment
damage. Make all connections in accordance with national and local electrical codes.
The device power (24 Vac/dc) is connected to the terminal marked PWR. This terminal is used for the
positive dc voltage or the hot side of the ac voltage. The device is reverse voltage protected and as such
will not operate if connected backwards.
For voltage output signal types (3-wire) or for AC power supply operation (3-wire), the common of the
power supply is connected to the terminal marked COM. Note that this device has a half-wave type
power supply which means the power supply common is the same as the output signal common.
Therefore, several devices may be connected to one power supply and the output signals all share the
same signal common. Use caution when grounding the secondary of an ac transformer or when wiring
multiple devices to ensure that the circuit ground point is the same on all devices and the controller. This
terminal is not used for loop-powered 4-20 mA output type (2-wire).
The analog output signal is available on the OUT terminal. This signal is switch selectable for either a
voltage output or a standard loop-powered 4-20 mA output signal type. When voltage mode is selected,
either 0-5 Vdc or 0-10 Vdc can also be selected. These options are clearly indicated on the device circuit
board. The analog output signal is typically connected directly to the Building Automation System
(B.A.S.) and used as a control parameter or for logging purposes.
For voltage type output signal the device has a minimum load that it is able to drive, similarly for current
type output signal the device has a maximum load that it is able to drive with a particular power supply
voltage. Observe and follow these ratings in the Specification section or inaccurate reading may result.
The 4-20 mA output signal can easily be converted to a 1-5 Vdc signal for controllers accepting this type
of input. Simply insert a 250 ohm (0.1% is best) resistor between the “+” and “-” inputs of the controller.
This will convert the 4-20 mA signal to the desired 1-5 Vdc.
Figure 5
Wiring for output signals and 24 Vac/Vdc
power from controller
Analog Input
Common
24 Vdc/ac Power
Controller
OUT
COM
PWR
OUT
COM
PWR
Controller
Power Supply
Input
Common
Common
24 Vdc
OUT
COM
PWR
Controller
Input
Common
24 Vac
OUT
COM
PWR
Controller
Power Supply
Input
Common
Common
24 Vdc
1:
LO
MID
HIGH
+/-
5/10
2:
ZERO
3:
VOLT
mA
24 Vac Power Supply, 4-20 mA Output
24 Vdc Power Supply, 0-5 Vdc Output
24 Vdc Power Supply, 4-20 mA Output
OUT CO
M
PWR
LO
HI
1
2
3
IN-GE-LPXXXS-02
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