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SSR Power Output Not Shutting Off

Started by SGray, September 30, 2024, 12:09:45 PM

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SGray

I've upgraded my brewery controller from 120V to 220V (similar to Brew BuddyII for HERMS) and during testing I've found that power output for both 40A SSR's (HLT & boil) does not fully shutoff when SSR is not activated.

When both the PID "out" and associated SSR indicator lights are OFF, I still measure voltage at the SSR power output and downstream L1 path (from 65V to 110V - L1 to neutral or ground).  Is this expected SSR behavior to always have some measurable voltage on the power output?  I do not recall the 25A SSR in my old 110V system behaving this way.

Additionally, an indicator light I have connected to the associated L1 lead of the heater outlets is always on/lit when the HLT and Boil switches are turned on, regardless of SSR state. The heaters do work as anticipated and 220V power (L1+L2) at heater outlet is measured as expected, 0V with SSR off ~220V with SSRs activated.

SSRs are attached to SLY-1512 & SYL-2352 for HLT and Boil respectively.  Both heating elements are 220V 5500W, connected to power via SSRs (L1 only), 2P contactors and 2P breakers like BB2.
I've followed SSR trouble shooting guide and confirmed that PID OUT and SSR indicators are properly sync'd, confirm no other power sources back track to SSR and confirmed proper control connections from PIDs to SSRs and line (L1) power in and out of SSR.

Kkane

SSR will have some leakage at off status. Thus, you will get some AC voltage on its output when it is off. But the leaked amp is very small so it will not turn on any large loads, but it will be large enough to turn on some small loads like LED.

The correct way to test the SSR is via a real load, like a table lamp.

SGray

Thank you for the fast response and that information. 

I did my testing on both circuits with the 240V/5500W heaters attached.  I understand the leakage, but was surprised based on past SSR use, that it was enough to power the 110V LED indicators attached to the L1 leg switched by the SSRs.

As mentioned, both heaters are working as anticipated, but I wanted to confirm the SSRs were functioning properly before I put the controller in service.

Thank you very much for you time and help,
Steve