Violectric PPA V600, Руководство пользователя

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7
The Earth / Grounding Concept
General GROUND-LIFT Jumper (accessible from the inside.
Mind the SECURITY INSTRUCTIONS !! ):
Ex-works this jumper is set to the LIFT position.
The internal ground potential is “lifted” by means of this jumper.
As a result, the interconnection for DC voltages and lower frequencies
(< 150 Hz) will be cut. Higher frequencies will be bled off to earth
potential through the RC filter. The LIFT position is helpful in case of
hum or jitter caused by different ground/earth potentials.
Of coarse full electrical protection is garanteed as the case is always
connected to ground/earth potential!
See also: page 20 / 26, Technical Appendix.