Clients chiller pump has a thermal OL that "someone" has maxed out. FYI - Schneider LRD 12. Anyway, I have not looked at the installation yet, so I do not know the necessary, like what is the nameplate rating of the motor, etc, but my question does not need that right now.
What does turning the dial all of the way to its max do? I have never done it.
Also, if it is set to Manual reset, what would cause the motor to immediately begin running again when releasing the stop button?
Is the attached not set to "H"?
The old rule of thumb I learned a long time ago when dial adjustable OL relays first came on the market here in the US in the late 70s, was that for every tick mark on the dial that was above the FLA of the motor, you cut the motor life in half. We don't know your motor FLA, but let's say it was 6A. There would be 3 tick marks on that relay above 6A, so your motor life will be reduced to 1/2 x 1/2 x 1/2 or
1/8 of normal expected motor life. So the effect is not immediate, but eventually you pay the piper. In this case however, they have turned it up way past the last tick mark, and these are not linear, so there is no telling what the trip level will be now, but I would extrapolate that it would likely end up at 10A in that position, so take off at least another 1/2. This means if your motor would have been expected to last for 20 years, it will not last for about 14 months.
If the OL is set to Auto, AND the dial is adjusted beyond the calibration, it's entirely possible that it will reset immediately. Cut that 14 months down to about 2, maybe less ...
Here's something else I observed here, which may explain what you are seeing. I see only two wires going into that contactor on L1 and L2. Those IEC overload relays will nuisance trip on single phase power unless you have current flowing through all three poles. So if whomever installed that had READ THE FACTORY MANUAL, they would have seen that it instructed them to exit from T2, then loop back around to L3, and connect the motor leads to L1 and L3. By not doing that, they set this up for failure, then tried to make the problem go away by cranking up the OL relay. Bad idea. That motor is not likely to last much longer, the insulation is probably deteriorated already.
That contactor on the right isn't looking too good either by the way...