Grass Valley XtenDD DD - Manual (Page 63)

PE TE
5. Connection and Startup
5 - 1 Planning and Installation - Rev. 3 / 04.2005
5. CONNECTION AND STARTUP
5.1 GROUNDING REQUIREMENTS
For grounding of the devices, the following three methods are
possible:
1. Grounding with the protective earth of the mains cable which
contains the earthed protective conductors (normally).
2. Additional protective grounding as a potential compensation or earth
conductor with large cross section with PE terminal. The jumper
TE - - PE must not be broken!
The earth connection has to be made before connecting the mains
cable!
3. Additional noiseless functional protective earth low on extraneous
voltage with TE terminal. The jumper TE - - PE must be disconnected!
The earth connection has to be made prior mains cable connections!
Detailed information see in the sections below.
Protective grounding
Grounding of the device serves the product safety and meets the requirements in
conformity with safety class I.
The device is connected with the protective earth of the power supply circuit (e.g.
the studio) by means of the mains cable which also contains the earthed protective
conductor PE.
Precondition is an earthed and checked mains socket!
In the device, the power socket is provided with a leading protective contact. This
protective contact is internally connected with the parts to be earthed, e.g. the case.
The effect of the protective earth connection must not be neutralized through the
use of an extension cord without protective earth conductor, through an exces-
sively long cable, nor must its function be disabled in any other way!
Additional earth conductor
At the rear the device provides separate screw terminals for protective earth and
video earth grounding. On delivery to the customer PE and TE terminals are joined
by a short-circuit jumper.
The PE terminal, marked by the symbol 417-IEC-5017 (protective earth), is in-
ternally connected with the AC IN power socket and the metal case parts.
The TE terminal, marked by the symbol 417-IEC-5018 (video earth, system
earth, technical earth), is connected with the reference potentials (ground, GND)
of the internal supply DC voltages and the video earth.
When connecting an additional earth conductor, this connection has always to be
made before connecting the mains cables.