I have just acquired a GS35B PSU. It is 3 phase and the schematics show 3 x
NTC thermistors in series with each primary. I presume that these are some
kind of soft start. I am not familiar with these devices but they make me
uncomfortable, I have always used a series resistor that is shunted by a
relay after a few seconds in the past. I do not have the model number of the
devices used as I will need to open the PSU to find out what they are but I
assume that they are similar to this device.
[1]http://www.ametherm.com/datasheetspdf/MS325R020.pdf
The resistance varies depending on the load current and they get hot in
order to operate, this really puts me off. They have quite a long time
constant so I am uneasy about them altogether.
Should I be concerned and replacing them with a soft start for each phase?
Apart from that the PSU is very nicely made and will provide up to 1.6A@
3600V.
Regards
Conrad PA5Y
References
1. http://www.ametherm.com/datasheetspdf/MS325R020.pdf
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