Technical Information Chapter 4
CLV61x
Electrical installation
8015592/ZNI9/2017-06-13 © SICK AG · Germany · All rights reserved · Subject to change without notice 21
4.5 Prerequisites for the Safe Operation of the CLV61x in
aSystem
Risk of Injury/Risk of Damage due to Electrical Current!
Incorrect grounding of the CLV61x can, due to equipotential bonding currents between the
CLV61x and other grounded devices in the system, place the metal housing under a dan-
gerous voltage, cause malfunction and destruction of devices as well as damage to the ca-
ble shielding through heating, and thus cause cable fires.
Work on the electrical system must only be performed by qualified electricians.
Ensure ground potential at all grounding points.
In the event of damage to the cable insulation, immediately switch off the power supply
and have the damage repaired.
Where local conditions are unfavorable and thus do not meet conditions for a safe
earthing method (same ground potential at all grounding points), take measures in
accordance with the following explanations.
The CLV61x is designed and tested for electrical safety according to EN 60950-1: 2011-01.
It is connected to the peripheral devices (power supply, reading pulse sensor(s), PLC, Host
etc.) via shielded cables. The cable shield, for example, for the data cable rests against the
metal housing of the CLV61x. The device can either be grounded through the cable shield
or through one of the threaded blind holes.
If the peripheral devices have metal housings and if the cable shields also lie on their hous-
ings, it is assumed that all devices involved in the installation have the same ground poten-
tial.
This is achieved for instance by complying with the following conditions:
Mounting the devices on conductive metal surfaces
Correctly grounding the devices/metal surfaces in the system
If necessary, low-impedance and current carrying equipotential bonding between areas
with different ground potentials.
CLV61x
closed current loop
with equalizing currents
via cable shield
grounding point 2
grounding point 1
grounding potential difference
PLC
Reading clock
sensor
I
U
CDB620-
001
= metal housing = plastic housing
= shielded electrical cable
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