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5. EchoSmart Power Supply Unit (ESP)
The Echo Smart Power Supply Unit provides power to an EchoSmart Sensor and acts as a
communication hub to facilitate analog, digital and Wireless RF communications from an
EchoSmart Sensor.
EchoSmart Power Supply Units do not have display monitors or data entry keypads. They
are typically used in a Field Network arrangement in which an EchoSmart Controller
provides the user interface function for setup and monitoring of EchoSmart Sensors. See
Section 8: Communications, Outputs, and Networking.
5.1.
Power, Cabling, and General Electrical Connections for the ESP
This section pertains to the physical layout of the ESP terminal connectors and how
they are implemented. If you are wishing to network the ESP with other devices (Ex:
ESC, other ESPs, SCADA Systems, etc), see Section 8 for sample connection
diagrams.
5.1.1.
Power Requirements
100 to 240 VAC, 50/60 Hz – 1 A
Supply cable: 10-18 AWG, -40 to +140 F
Power 20 W (fused) 0.250A, 250V 5x20mm T-lag UL approved
4-20 mA Current Loop: 15 – 24 VDC (provided by the ESP)
Optional: 24 VDC (18 – 36 VDC Input)
Caution must be taken to supply main power in the form for which the equipment
is designed.
5.1.2.
Connections Overview (Figure 5.1 and Table 5.1)
The ESP circuit board contains four screw-terminal connectors as well as additional
plug-in connectors as shown in Figure 5.1. Use caution in tightening the screw
terminals to prevent damage from over-tightening.
Ensure the power cable (10-18 AWG) is connected to the power connector
properly. Sensors (ESS) should be connected to the power supply by color code as
shown in Figure 5.1 below. Table 5.1 contains a functional description of the screw
terminal connectors.