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Appendix 1: System Protective Earth Grounding
Excel
800
EN1B-0375GE51 R0910
82
Example 2
Connecting an Excel 800 System together with other
controllers earth-grounded as per EN60204-1.
Notes
Use a noise-free earth ground inside the cabinet.
Use one star-point to split power for controllers and field
devices.
If the transformer is used for several controllers, each
controller ground has to be wired separately to the star-
point.
If a field device that prohibits earth grounding is
connected to the system ground, an isolation monitoring
device must be used instead of earth grounding.
If the field device transformer is physically far away from
the controller, earth grounding must still be performed for
the controller.
►
Connect earth ground to the respective terminal of the
controllers, see figure below.
24 V
~
24 V0
XCL5010
XL100C
24
V
~
24
V
~
2
71
1
72
24
V
~0
XSL511
24
V
~
2
1
24
V
~0
XL50
24
V
~
2
1
24
V
~0
24
V
~0
XCL8010
24
V
~
1
2
24
V
~0
FIELD
DEVICE
24
V
~
GND
Y
LINE
NOISE-FREE EARTH GROUND
(ONLY ONE PER SYSTEM)
Fig. 112 Connecting and earth grounding mixed
controllers (single transformer)
NOTICE
Equipment damage!
Terminals 1 and 2 are assigned differently on the XCL5010
and XCL8010 Controllers.
►
Make sure that earth ground is connected to the correct
terminal according to Fig. 112 and the respective
connection diagrams.
The XL40, XL50, XL100C, Distributed IO, Smart IO, and the
Excel 800 System can share one transformer.
The XC5010C Controller always requires its own
transformer.
If EN60204-1 is applicable for the given type of controller,
the system ground has the same potential as one terminal
of the power supply.
Example 3
Connecting a C-Bus with controllers earth-grounded as per
EN60204-1.
Notes
Use a noise-free earth ground inside the cabinet.
Do not use the controller terminals which are normally
used for C-Bus shield connection.
Be sure to wire the shield only once per bus connection
to the earth ground; this is to prevent any current draw
over the shield.
A permanent earth ground potential difference of more
than 24 VAC may destroy the related controllers.
►
Connect earth ground to the respective terminal of the
controllers, see figure below.
XCL5010C
C+
C-
16
15
18
17
XCL8010
NOISE-FREE EARTH
GROUND (ONLY ONE
PER CONNECTION)
MAX. 24 V POTENTIAL
DIFFERENCE ALLOWED
BETWEEN EARTH GROUNDS
C+
C+
C-
C-
5
5
C+
8
6
6
C-
9
SHIELD
10
XCL5010
XL50
Fig. 113 Connecting C-Bus with multiple controllers earth-
grounded as per EN60204-1
If a system ground of the controller is connected to the earth
ground, the available terminals for shielding the C-Bus must
not be used. Instead, the C-Bus shield must be connected
to the earth ground, but only once per bus connection.