Thermo Scientific LevelPRO Series, Руководство по установке

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Wiring
Current Output
4-10
LevelPRO Installation Guide Thermo Fisher Scientific
The default current output configuration is isolated, loop-powered. With
this configuration, the 4–20 mA loop is supplied by the customer’s PLC or
DCS. A jumper is placed across pins 4 and 5 of the J7 connector on the
CPU board. J10-6 and J10-7 are for the 4–20 mA output connections.
Figure 4–3. 4–20 mA loop powered configuration
With the non-isolated, self-powered configuration, power for the 4–20 mA
loop is supplied by the gauge, but it is not isolated from the gauge circuitry.
A jumper is placed across pins 3 and 4 of the J7 connector on the CPU
board. J10-6 and J10-9 are for the 4–20 mA output connections.
Figure 4–4.
4–20 mA non-isolated, self-powered configuration
With the isolated, self-powered configuration, power for the 4–20 mA loop
is supplied by the gauge, and the output is isolated from the gauge
circuitry. The isolated piggyback board (p/n 886595-1) must be installed
on the CPU (see Figure 4–5). This puts the 4–20 mA output on
connections J10-6 and J10-8. No jumpers are used for this configuration.
Figure 4–5. Isolated piggyback board
Isolated, Loop
Powered
Configuration
Non-Isolated, Self-
Powered
Configuration
Isolated, Self-
Powered
Configuration