- Location
- Scotland
Yeh, so terminals 4 and 5 are the switched relay terminals and 7 is common. Doesn't appear from the instruction you have there, that you can change the default logic from NO to NC, so you would need to use an external relay with its input wired to your weigher - when your weigher closes its contacts, your external relay energises and goes from NC to open.
May as well use a low voltage 12V coil external relay, as it's just that bit safer than switching mains voltage between the two devices. Just make sure the external really is fully mains rated on its output.
No. It's what's known as a dry (or voltage free) contact.But is the output from the internal relay not going to be 240v? So I would need a 240 coil relay?
Or have j got that wrong somehow?
Just think of terminals (4 and 7) and (5 and 7) as two (independent) switches. That's really all they are. You only really need one pair, either 4/7 or 5/7, you choose.I'm gonna have to draw myself a diagram to make sense of all this!
Mmmm yeah OK.So really I've got 3 circuits going on.
A 240v circuit to the control unit.
A 12v external relay circuit
And a 240v motor circuit?
Taking a straight AC feed would be the simplest. Just triple check all your wiring and make sure you have inline fuses. I know I keep repeating this, but mains wiring doesn't take kindly to mistakes.But at the points where I feed my 240 v into the control unit I can take a feed off there, and step down and change to DC to run the external relay circuit?
Or is just taking a feed straight to a 240v relay simpler?
Interesting thanks.If you can find the 12Volt Aux output it will be able to run the external 12Volt relay for you, reducing the high voltage circuit, always a good thing. Probably just two pins on the connector.
Just an idea mind ........
I'll check tomorrow. Yeah it is.And if you put 4kg on do you get 200?
Is your load cell running from the box output?
Yeah there's a reset/zero button on the front.No worries ..........
I see you have the option of a reset button. that connects across pin 8 and 9 wonder would that help, so you start from zero?
That may depend on the variant though?If you can find the 12Volt Aux output it will be able to run the external 12Volt relay for you, reducing the high voltage circuit, always a good thing. Probably just two pins on the connector.
Just an idea mind ........
dose it trip a limit switch or something to that effect.Meant to say I stops at required weight on scales