Do you recommend the Output negative (- , Gnd) be tied to Earth Ground (PE/FG)?

No, this is not recommended. What we know from the Industrial PS background that it needs to have isolated gnd. In a complete system, there are many components such as VFDs, Servos, Motors, and Contactors which are all switching devices. They will generate a large amount of harmonics if the output ground is tied to FG then the noise from these would possibly get coupled with PS and if the PS is supplying the power to PLCs, Analog devices are susceptible to these noises.

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