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Connecting the SmartLogger to a Split EMI
The EMI used in Europe and Southeast Asia is composed of sensors, whose signals need to be converted into RS485 signals (Modbus-RTU) over an extra analog-to-digital converter before the sensors are connected to the SmartLogger.
The analog-to-digital converter should provide an RS485 port and support the standard Modbus-RTU protocol. This section describes the connection between the SmartLogger and a split EMI through the ADAM4117 that functions as an analog-to-digital converter.
There are three RS485 ports in the SmartLogger. For the port descriptions, see Context in Connecting the SmartLogger to the SUN2000.
Figure 4-23 shows how to connect the SmartLogger to a split EMI through an RS485 signal SPD and analog-to-digital converter.
- Prepare a cable with an appropriate length, strip a proper
part of the insulation layer from one end, and connect the end to
the port on the analog-to-digital converter.
- The DJYP2VP2-22 2x2x1 computer cable or a communications cable with a conductor cross-sectional area of 1 mm2 and outer diameter of 14–18 mm is recommended.
- For detailed operations, see the document delivered with the analog-to-digital converter.
- Remove an appropriate length of the steel armor and wire insulation layer from the other end of the cable using a wire stripper, as shown in Figure 4-24.
- Insert the bare core wires into the surge port of the RS485
signal SPD, as shown by (1) in Figure 4-25.
Verify that the RS485+ port on the analog-to-digital converter connects to surge port 1 or 7 on the RS485 signal SPD, and that the RS485– port on the analog-to-digital converter connects to surge port 5 or 11 on the RS485 signal SPD.
- Use a flat-head screwdriver to tighten the screws on the surge ports, as shown by (2) in Figure 4-25.
- Set Baud rate for the analog-to-digital
converter to the same value as that for the SmartLogger.
- SmartLogger communications parameters can be set on the LCD or WebUI. For details, see Setting Communications Parameters or Setting RS485 Parameters.
- For details about the communications parameter configurations for the analog-to-digital converter, see the delivered document.
- Connect each sensor to the analog-to-digital converter.
For detailed operations, see the documents delivered with the analog-to-digital
converter or sensors.
- After connecting the cables, log in to the embedded WebUI and set relevant parameters. For details, see Setting EMI Parameters. The selected EMI model is Sensor(ADAM).
- The EMI cannot be detected automatically. You need to add this device manually on the LCD or WebUI. For details about this operation, see Managing Devices or Connecting Devices.
- If the SmartLogger needs to connect to an EMI and multiple inverters, connect the EMI at the end of the daisy chain, and verify that other devices connected to the port have different addresses from the EMI. For the daisy chain connection, see Connecting Multiple Inverters to the SmartLogger.
