User's Manual

Table Of Contents
DIB-500 R4.1 Setup and commissioning
Connection to the electrical system
108 Installation, Operation and Service Manual 90DIB500R41IM_FCC02 99.1
You need a green-yellow earthing cable that is already connected to the earthing
system.
The equipment rack must be accessible from above.
The upper cover of the equipment rack must have been removed, refer to
section 5.4 on page 94.
Carry out the following steps:
1. Loosen the outer nut of the earth connection on the equipment rack using the 13-
mm ring spanner.
2. Remove the spring washer and the plain washer.
Cable damage
If cables are routed over sharp edges or in bending radiuses too small for the cables,
the cables may be damaged.
Never route cables over sharp edges and always maintain to the bending radius.
3. Slide the eye of the grounding cable onto the threaded bolt of the grounding con-
nector.
4. Slide the washer and then the spring washer onto the threaded pin of the ground-
ing connector.
5. Retighten the outer nut of the earth connection using the 13-mm ring spanner.
The equipment rack is connected to the grounding system.
5.6.2 Defining the reference potential
The reference potential must be defined at the terminal block of the DIB-500 R4.1
depending on the earthing (reference potential) on site (negative terminal earthing or
positive terminal earthing). To do so, you have to connect an earthing cable preinstalled
at the terminal block corresponding to the reference potential at the location to a spe-
cific terminal of the terminal block.
The reference potential must be defined for V
DC
as well as V
AC
voltage supply.
Defining the reference potential
Preparation:
The voltage source on site must be switched off.
The equipment rack must be connected to the grounding system.
The toggle switches must be set to the "Off" position ("downward" switch position).
The site must be prepared in compliance with the document "Site Requirements".
The top cover of the equipment rack must have been removed.
The reference potential on site must be known.