Important Installation Instructions; Grounding / Shielding - Honeywell ACS-8 Installation Instructions Manual

Installation Instructions / ACS-8
5.

Important installation instructions

(See also chapter = Safety instructions)
5.1 Grounding and shielding
Use shielded cables and a suitable shielding connection for protection against electromagnetic interference.
Make sure that the line shields in the distribution boxes are connected so that there are no links to other
potentials. In the ACS-8, all shields should be connected to one point using the shortest possible route.
The shield soldering bar serves as a common point for connection of the ground conductors and line shields
(see below).
Circuit diagram DB1 and DB2 grounding bridges:
The grounding bridges are located on the CPU board near the power supply unit connector (see chapter
15.1).
The following shielding connections can be made:
Connect the shield soldering bar to the ground conductor and keep the grounding bridges closed
With this method, the DB1 and DB2 grounding bridges provide a capacitive coupling between the ground
conductor and the system operating voltage.
This connection offers excellent protection against conducted interference and cable shield discharges.
However, this connection must only be used if PE and N are connected separately (modern grounding) and
if it is guaranteed that the ground conductor does not carry any high or low frequency signals.
Connect the shield soldering bar to the ground conductor and open the grounding bridges
In this configuration, the capacitive coupling to the system operating voltage is interrupted by the removing
the grounding bridges. This connection should be used if the ground is susceptible to interference, where
the capacitive coupling would transfer it to the ACS-8.
Connect the shield soldering bar to the incoming mains terminal
With this configuration, the shield soldering bar ust
be connected directly to the incoming mains
terminal. This method is used where the ground
conductor is heavily loaded and is the only way to
overcome interference, if there is a problem with
the previous methods described.
See:
þ
þ
VDE 0800 part 2 edition July 1980
VDE 0800 part 2 AI draft
November 1982
13