Hello I have an ST-408n controller that has a 0-10V analogue output and I have a 400V 6kW heater to heat water in a buffer tank. I would like to use this 0-10V output on the ST-408n to control the heater? Is this even possible? Thank you in advance for your answers Greetings

It is possible, you need a phase regulator on a triac or thyristor with a current carrying capacity of at least 6kW/230V = 26A , since triacs are quite cheap a BTA41-600B, for example, will be plenty suitable. Simplest triac control scheme + potentiometer. Of course, in order to control the triac with a DC 0-10V signal, a zero detection circuit is required, which, depending on the input signal, will drive the triac to the specified power.

All ok, except that the heater is on 400V (three-phase).

No problem, a separate triac for each phase and of course a smaller 26/3~ 8.5A will come out.

ST408n - Can the 0-10V output control a 400V 6kW heater?

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#1 15247632 17 Dec 2015 08:21

martinos1978 martinos1978

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Post #1
15247632 17 Dec 2015 08:21

Hello
I have an ST-408n controller that has a 0-10V analogue output and I have a 400V 6kW heater to heat water in a buffer tank.

I would like to use this 0-10V output on the ST-408n to control the heater?
Is this even possible?

Thank you in advance for your answers
Greetings
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#2 15247880 17 Dec 2015 10:38

h3c4 h3c4

Level 15

» | Helpful post? (0)

Post #2
15247880 17 Dec 2015 10:38

It is possible, you need a phase regulator on a triac or thyristor with a current carrying capacity of at least 6kW/230V = 26A , since triacs are quite cheap a BTA41-600B, for example, will be plenty suitable.

Simplest triac control scheme + potentiometer.

Of course, in order to control the triac with a DC 0-10V signal, a zero detection circuit is required, which, depending on the input signal, will drive the triac to the specified power.
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#3 15248302 17 Dec 2015 13:52

martinos1978 martinos1978

Level 10

» | Topic author Helpful post? (0)

Post #3
15248302 17 Dec 2015 13:52

All ok, except that the heater is on 400V (three-phase).
#4 15248387 17 Dec 2015 14:27

h3c4 h3c4

Level 15

» | Helpful post? (+1)

Post #4
15248387 17 Dec 2015 14:27

No problem, a separate triac for each phase and of course a smaller 26/3~ 8.5A will come out.
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