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MBZ-00001-01
3.4
Rack Frame Earthing
The power supply case is internally connected to the mains earth. Because the unit's
case and the subrack guide rail are unpainted, a good electrical earthing connection
should be made between the unit and the subrack.
In addition, it is strongly advised that a further secure electrical connection is provided
by means of a dedicated earthing wire.
Warning:
Failure to use a dedicated earthing wire may result in harmful voltage levels
between the subrack and the power supply, and/or miscellaneous power
supply switching noise problems in both receivers and transmitters.
3.4.1
Earthing Procedure: Method 1
To earth the power supply:
• Connect an earthing wire between the earthing stud terminal at the rear of
the T809-10, and a conveniently located screw on the subrack. The connec-
tion to the power supply's M5 earthing stud can be made using bare wire or
a Ring/Spade Terminal.
• Ensure that a secure electrical and mechanical connection is achieved by
testing continuity.
3.4.2
Earthing Procedure: Method 2
Warning:
This method can only be used if a mechanically and electrically secure con-
nection between the –DC terminal and the subrack exists as part of the sys-
tem.
To earth the power supply:
• Connect the earthing wire from the T809-10 earthing stud terminal to a –DC
rail (0V) terminal. The earthing connection can be made between the stud
terminal and the negative output of the power supply.
• Ensure that a secure electrical and mechanical connection is achieved by
testing continuity.
Note:
Ensure that the wire cross-section specifications of the DC output connector
are observed (refer to Section 3.3.1).
Copyright © 2004 Tait Electronics Ltd
Installation Guidelines
November 2004
25
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