LG Electronics 120S user manual Burn-out detection function, Type Wire, No wiring Shield wire

Chapter 7 Usage of Various Functions

8) Burn-out detection function

The RTD input module has the function of burn-out detection on the Pt100, JPt100 or cable.

•As shown below, if disconnection occurs in the RTD or cable then a voltage outside the measurable range voltage is inputted by the internal burn-out detection circuit and burn-out detection error code is generated.

•The RTD input module can detect disconnection for each channel. But, burn-out detection is possible only in the channels enabled.

•If disconnection is detected in two or more wires, first, disconnection error code is generated by ‘b’ and then disconnection error code is generated by ‘A’ or ‘b’ sequentially. If disconnection is detected simultaneously in ‘A’ and ‘B’, only disconnection error code is generated by ‘b’.

Connection		Connection Example	Remark
Method
2-wire	burn-out detection area		- In 4-wire type, only all wires marked '2'
type
			connected to the terminal block A are all
			detected as disconnection then the A
			disconnection error can be detected.
3-wire		burn-out detection area
type

4-wire

type

burn-out detection area

No wiring

*1 : Pt

*2: Shield wire

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