User's Manual

Installation, Operation and Service Manual 90DIB500R41IM_FCC02 – 99.1 109
DIB-500 R4.1 Setup and commissioning
Connection to the electrical system
Carry out the following steps:
Risk of short circuit.
The product may be damaged if the live wires of the voltage supply cable are connected
without grounding. In addition, an incorrectly connected earthing cable can cause a
short circuit, e.g. if the voltage source requires grounding on the positive terminal, the
earthing cable, however, is connected to the terminal marked with "-".
➔ As an overvoltage protection and lightning arrester, it is mandatory that one terminal
of the supply circuit be earthed.
➔ Connect the preinstalled earthing cable corresponding to the earthing at the location
as described below.
Risk of electric shock
Electric shock when touching live parts. Hardware components in the equipment cabi-
net are live.
➔ When performing work in the equipment cabinet, ensure that the voltage source on
site is switched off. This must have been checked with a voltmeter.
➔ Connect the preinstalled yellow-green grounding cable (1) according to the earth-
ing at the location
➔ in the case of positive terminal earthing with the terminal identified by "+" (3), or
➔ in the case of a negative terminal earthing with the terminal identified by "-" (2), see
Figure 5.15.
Figure 5.15 Terminals for defining the reference potential
✓ You have successfully defined the reference potential.
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