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19“ HVPS-HC Module R012 Manual | Surface Concept GmbH
when a HV module with floating capability is stacked on top of a reference voltage, then it can happen that
the floating, “upper” HV module “pulls up” the reference voltage of the “lower” reference HV module when
operating. This “pulling up” effect is caused by cross current flows from the one to the other HV module
and it depends on the output voltage of the floating HV module in respect to the output voltage of the
reference HV module as well as on the internal resistances to ground within the different modules and on
the polarity of the output voltages of the both HV modules (e.g. the “pulling up” effect is much stronger for
different polarities between the both modules then when both polarities are the same).
4.4 Floating Operation
For the 2 channel version of the 19” HVPS-HC Module R012, one can not only use external HV supplies
to provide a reference voltage, but also one of the both channels of the R012 can be used as reference
potential for the other HV channel.
The connection scheme of one HV channel of the 19” HVPS-HC Module R012 in floating operation in
reference to the second HV channel is shown in Figure 7.
Figure 7: Connection scheme for floating operation of one HV channel of Module R012in respect to the second HV
channel.
4.5 Limitations of Floating Operation
