Honeywell Excel 800 SYSTEM Installation And Commissioning Instructions page 82

Appendix 1: System Protective Earth Grounding
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.
XCL5010 XSL511
24 24 24 24
V~ V~0 V~ V~0
2 1 2 1
24 V~
LINE
24 V0
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.
EN1B-0375GE51 R0910
XL50 XL100C XCL8010
24 24 24 24 24 24
V~ V~0 V~ V~0 V~ V~0
2 1 71 72 1 2
24
V~
Y
GND
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+
15 16
NOISE-FREE EARTH
GROUND (ONLY ONE
Fig. 113 Connecting C-Bus with multiple controllers earth-
FIELD
DEVICE
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.
82
XCL5010 XL50
C- C+ C- C+
17 18 5 6 5
MAX. 24 V POTENTIAL
DIFFERENCE ALLOWED
PER CONNECTION)
BETWEEN EARTH GROUNDS
Excel 800
XCL8010
C- C+ C-
SHIELD
6 8 9 10