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8 5 Grounding
8 5 1 Why ground
Before starting to work on the electrical system make sure
that all components are disconnected from the power
source. Only switch on the system when you have finished
all work.
Grounding is mandatory to protect the users from poten-
tially fatal electric shocks. It also protects against electric
charging or a short circuit inside the device. This is ac-
complished through clamping, bolting or other mechanical
means to provide an effective grounding path to the earth
to ensure safe operation at all time.
The grounding is also important to the system for lightning
protection. In general it is meant for indirect lightning
strikes and induced electrical potentials during operation of
the pump system.
Figure 12: Protective earth connection
+ –
GND
protective earth
connection for controller
Figure 13: Controller grounding
Picture may differ to product
BERNT LORENTZ GmbH & Co. KG Kroegerskoppel 7, 24558 Henstedt-Ulzburg, Germany, Tel. +49 (0) 4193 7548 - 0, Fax - 29, www.lorentz.de
All specifi cations and information are given with good intent, errors are possible and products may be subject to change without notice. Pictures may
differ from actual products depending on local market requirements and regulations.
8 5 2 How to ground
A protective earth connection for the controller must be
connected to the left GND terminal. The right GND terminal,
next to the motor phases (L1, L2, L3), is for the protective
earth wire of the motor.
8 5 3 Insufficient ground source
Where there is an inadequate ground source you can use a
grounding rod. A grounding profile rod should be located
about 4 – 5m (13 – 16 ft) from the controller. The cable must
not carry any mechanical loads. The rod must be completely
buried in the ground (0.5 m / 1.5 ft below ground level). You
must refer to local standards and requirements. The ground-
ing cable should be a copper cable with a cross section of
not less than 16 mm
1
3
5
7
9
L1 L2 L3
GND
2
4
6
8
10
protective earth
connection for motor
PS15k2
PumpController
grounding
cable
2
(AWG 6).
Figure 14: Grounding cable mounting at controller housing
bolt for ground connection
at controller housing
Figure 15: Grounding cable mounting at grounding profile rod
grounding
rod
16
CAUTION – The wiring has to be done
by qualified staff only Make sure that
the grounding cable has a reliable
connection to the ground source
CAUTION – The earth cable must be
sufficient to carry the maximum supply
fault current
washer
cable
tooth washer
washer
nut
nut
washer
tooth washer
cable
cable washer
bolt
Sun. Water.
Life.
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