Solid State Relay (SSR) Question

[dbtoutfit]

The ssr works and kicks on no problem IF i use a 6v battery pack to juice it.
If i use the BOB it doesnt. I have everything setup correct and mach3 is controlling the Pinoutput fine.

The problem i have is before i attach the ssr i get 4.99v across the gnd and output pin from the BOB. Once attached to the SSR it drops to 2.8v

I add 5v 1.2a power supply to my BOB but it doesnt help.

When the battery is plugged in and i check, the voltage is the same as when the battery is unplugged.

I get the idea that voltage drop could be due to lack of mA but a 1.2amp supply should be enough. What am i not getting or understanding?
TIA!
Eric

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[Al_The_Man]

What is the part number of the SSR?
What is the input range?
Is it DC or AC output switching?
What BOB?
Sounds like the output from your BOB is not compatible.
Al.

[dbtoutfit]

https://www.amazon.com/gp/aw/d/B0087...?ie=UTF8&psc=1

[mactec54]

https://www.amazon.com/gp/aw/d/B0087...?ie=UTF8&psc=1

Do you have the 5v/common on both connected inputs, you need it on both lots of optos the computer side and the output side, your breakout board is showing where to connect the input power

[dbtoutfit]

I have (-4) on GND pin next to P17 and (+3) on P14

I have 5v 1.2a psu connected at the top right 5v and GND on the right. But it doesnt seem to help.

Someone mentioned wiring (+3) to the 5v psu and the (-4) to P14 because it can prob pull down better than supply 5v.

Sent from my LG-LS997 using Tapatalk

[john-100]

Hi Eric

I have found what looks like a version of your BOB and working from the photo

it looks like the 12 outputs have a 1k pullup resistor connected to +5V
and are also connected to the Collector of the NPN transistor thats part of one of the twelve PC817 opto isolators
the Emitter is connected to the BOB's GND


So you need to connect the SSR treminal 3 (+) to the BOBs +5V
and the SSR terminal 4 (-) to one of the BOB's outputs



the SSR switches ON when the output goes low


John

[dbtoutfit]

John,

I got your reply too late. I already hooked it up but without the pullup resistor. Seems to work fine so far.

Thx for your time!

Sent from my LG-LS997 using Tapatalk

[RCaffin]

I would be a little cautious about running it with no pull-up resistor. You would be relying on the current limit in the output driver, and that may cause it to overheat. I suggest you try a few different small series resistors, or just calculate from the SSR specs what the resistor should be.

Cheers
Roger

[john-100]

Hi

the twelve pullup resistors are on the breakout board , the long yellow arrow points to the resistor on the board and the circuit running along the PCB edge is part of one output

John

[Al_The_Man]

It has been my experience that the current required for most SSR's is not that high, it would be easy to find out by supplying the 6v as in the OP and measure the current.
Al.