SSR stuck on???

gnydick

gnydick

@Phaedrux can I use a different connection to trigger the SSR while I wait for the replacement?

A Former User

If its not covered by warranty and you want to use the SSR anyway you might get away with soldering a wire from the gate on the bed FET and run that to the SSR input. (you may have to invert the output if you do)

Edit: sure, can def use any of the fan outputs instead.

gnydick

@bearer any pointers on how to set that up? Would I just wire two of the pwm pins to the SSR and map the bed heater to that pwm?

Phaedrux

Since the bed heater is being powered via SSR and the SSR input will accept lower voltage than VIN, you could use any other open heater or fan output with a little configuration.

If the Duet came with the RailCore kit I'd seek a warranty claim.

A Former User

@gnydick said in SSR stuck on???:

@bearer any pointers on how to set that up? Would I just wire two of the pwm pins to the SSR and map the bed heater to that pwm?

i'd use the "ground" from a fan, that ground is pwm controlled by the duet and you can use any supply voltage, the one on the fan output is convenient though. then unmap the fan if needed and map the heater. I'm sure some of the wizzards can help with the config if needed

gnydick

@Phaedrux I am, but it will take time. I'd like to get everything else tested out while I wait.

dc42

You can also use a spare heater output on the Duet or the DueX5.

Phaedrux

Here's the directions for using a chamber heater. It's the same principal. Using an alternate pin for controlling an extra heater. The only difference for you is that instead of defining a new heater 3, you'd be altering the configuration for heater 0 (the bed on duet 2)

https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_a_chamber_heater

gnydick

@Phaedrux thanks

jens55

It is highly unlikely that the SSR has failed since it is not stuck in the 'on' position. It is way more likely that there is a wiring error.
Are you aware that the positive line will always be high no matter if the heater is on or off?
Simply wiring the negative to ground will cause all these issues.
Verify the ruting of the two control lines.

gnydick

@dc42 do I remap a pin to H0 or do map a different heater to "bed"? I'm kinda lost as to which direction to go.

dc42

@gnydick said in SSR stuck on???:

@dc42 do I remap a pin to H0 or do map a different heater to "bed"? I'm kinda lost as to which direction to go.

If you are using RRF2 then use a different heater number. Use M140 with an H parameter in config.g to tell the firmware which one.

It's very usual to have a dud bed heater mosfet on a Duet. Is the bed heater LED on the Duet permanently illuminated too?

whosrdaddy

@gnydick : If I look at your photo, I believe you made a wiring error, you have wires labeled "BED-SSR" connected to the VIN connector and wired VIN to the Bed output connector!!!! Please double check your wiring, diagrams can be found here

dc42

@whosrdaddy said in SSR stuck on???:

@gnydick : If I look at your photo, I believe you made a wiring error, you have wires labeled "BED-SSR" connected to the VIN connecter an wired VIN to the Bed output connector!!!! Please double check your wiring, diagrams can be found here

Well spotted!

whosrdaddy

I stared like 10 minutes at his photo and didn't see the error, thanks to @jens55's remark, it all made sense

Phaedrux

Completely glossed over that one. Should have looked at the diagram.

Phaedrux

But my test asked to disconnect the bed wiring and test the terminals without an SD card present. Was that not actually carried out?

gnydick

@whosrdaddy yep, that was it! Thank you!

gnydick

@Phaedrux I didn't, I just disconnected the SSR and used the wires