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Russell H.
Russell H., Service Tech
Category: Consumer Electronics
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Experience:  8+ years of professional experience
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In a DC330B-KE-203-23-0A0000-00-0 temperature controller

Customer Question

In a DC330B-KE-203-23-0A0000-00-0 temperature controller there are two 4-20ma
outputs. Terminals 2 & 6, and 16 & 17.
QUESTION: do both these outputs have a source voltage (18-24vdc)?
Can at least one of these two outputs be modified to give a 4-20ma sinking signal
with no source voltage?
To be used as input to a device that generates its own source voltage of 24vdc.
Thank you.
Submitted: 1 year ago.
Category: Consumer Electronics
Expert:  Russell H. replied 1 year ago.

Hi, thank you for contacting My name is Russell. I will do my best to provide the right answer to your question.

Question, please, before I try to answer your question finally:

What do you define a 'source voltage' on an output?

- as, 'the output is from the source of a UJT or similar component internal to the controller'?

- or something else -?

Let me know please. Thanks.

Customer: replied 1 year ago.
Controllers usually provide a source voltage to drive the 4-20 ma signal, rather than rely on an external 24vdc
power supply. A sinking 4-20 output does not have a built-in power source, and relies on an external power source.
Expert:  Russell H. replied 1 year ago.

So in other words the controller in this case does not have a 24 VDC power supply to the chip in general and does not use such a supply nor switch it on its outputs. Rather, it has a 24 VDC (or perhaps 'within that range' input) that it switches on its outputs. Is that the case here?

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