Rice-lake 880 Performance Series Indicator/Controller Techni Manual do Utilizador descarregar pdf (Página 22)

16 880 Technical/Service Manual

2.4 Display Board Replacement

If the 880 display board must removed, use the following procedure:

1. Disconnect power to the unit.

2. Remove controller assembly (see Section 2.3).

3. Disconnect cable assembly.

4. To remove the display assembly, loosen and remove four

Kep nuts securing the DIN rail and display

assembly to the panel (see Figure 2-3).

5. Remove four screws and pull display board from the display assembly.

Display Board

Screws

Cable Assembly

Figure 2-9. VFD Board

6. To replace the display board, reverse the above procedure.

2.5 Cable Connections

The 880 has six external connectors, a terminal connector for the power cord, and a cutout for installed options.

Enclosure disassembly is not required to make connections to load cells, communications, digital inputs, and

digital outputs. These connectors are all externally mounted on the back of the controller.

2.5.1 Load Cells

To attach cable from a load cell or junction box, route the cable to the external J1 connector. Wire the load cell

cable from the load cell or junction box to connector J1 as shown in Table 2-2. If using 6-wire load cell cable (with

sense wires), open the unit (see Section 2.2) and remove jumpers JP5 and JP6.

Table 2-2. J1 Pin Assignments

Connector Pin Function

J1 1 +SIG

2 –SIG

3 +SENSE

4 –SENSE

5 +EXC

6 –EXC

For 6-wire load cell connections, remove

jumpers JP5 and JP6.

Note

For 4-wire installation, leave jumpers JP5 and JP6 on (see Figure 2-12).

Shield wire will attach to ground clamp on backplate.

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Rice-lake 880 Performance Series Indicator/Controller Techni Manual do Utilizador Página 22