Distech Controls PS-2AEULDP Series Посібник з монтажу - Сторінка 3
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Друкувати сторінкуWiring
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.
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.
The analog output signal is available on the OUT terminal. This signal is jumper selectable for either a voltage or a 4-20 mA output signal type. 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 6: Configuration Settings.
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