Opto 22 Series SSR: Is a common ground between Load and the control current required?

[Naysayer]

I have the datasheet but I'm not seeing anything that specific. It's an Opto22 series, DC60P, 3-24v control signal max.
Preparing a mock-up w/ 2 DC supplies so I can get a feel for it on the bench before I try to use it. I get that it's a current device.

 

[brandon7861]

Most SSR's have the control signal and load-switching mosfets isolated with an internal LED and photodiodes on each gate. With opto in the name, probably a safe bet this one is no different. The control and load can and should be isolated.

 

[nomadradio]

One of the reasons for this type gadget's design is to isolate the control circuit's ground from the load circuit's ground. Input is optically isolated up to 4000 Volts. Had no idea this brand is guaranteed for life until I saw the data sheet.

73

 

[Naysayer]

Today is the day I try to get it working on bench before I try to use it. Randomly reading posts about SSR's I saw several posts where people had them fail in batches/repeatedly. I'm taking that to mean they are fragile regarding current/polarity etc. Using only low current PSU's (<100mA to test). Bench supply ready but had to cobble together another w/lm317.

Edit
I just realized this is very similar to the T-R keying buffer.

Some time later: It works. I used a 14v LED for load and it lights at about 4vdc Control voltage requires very little current at 4vdc but the Control current increases to a max at 24vdc (max rated Control V) showing10mA.

Onward to install.....................