Kai / Andy,

Thanks for your responses.

1. I have no control over the duty cycle as its part of the test specification.

2. I can look at the supply dipping problem possibly. Maybe the SSR is switching on so rapidly that the SMPS ( MeanWell - 24V dc - 20A rating ) is lagging behind. Not because it cannot respond but maybe because of the interconnecting cable length between the panel and the solenoid - it is about 6 to 7m. And the rating of the SMPS is twice the maximum expected demand ( worst case scenario)

So going by what you both feel, the additional inductance must not pose a problem. Also there is nothing wrong in using the same supply for input and output as in my case I am using the SSR for current handling rather than for isolation.

But still what perplexes me is the increase in shift time of SOL_A when SOL_C is brought on line.( They are controlled by different SSRs ) Maybe I guess this will further point towards the supply dip as that is the only common fator to both SSRs ??

Assuming that supply dip is the issue, how to obvercome it now as I cannot reduce the cabling distance ?

Raghu