Appendix 1: System Protective Earth Grounding; Excel 800 Systems And Selv; Excel 800 Systems And Standard En60204-1; Earth Grounding Of En60204-1 Applicable Systems - Honeywell Excel 800 SYSTEM Installation And Commissioning Instructions

Excel 800

Appendix 1: System Protective Earth Grounding

Excel 800 Systems and SELV

In order to avoid distribution of noise or earth ground
potential differences over networks or other connections, the
XCL8010 Controller Module is designed to be in compliance
with SELV (Safety Extra-Low Voltage).
Furthermore, SELV offers the greatest possible safety
against electrical impact.
To support SELV, all Honeywell external (CRT series) or
internal transformers comply with standard EN60742.
Earth grounding is therefore not recommended.

Excel 800 Systems and Standard EN60204-1

However, if compliance with EN60204-1 is required, note
the following:
General Information about EN60204-1
EN60204-1 defines electrical safety for a complete
application/machine including controllers, sensors, actuators
and any connected/controlled electrical device.
EN60204-1 requires controllers to be powered by PELV
(Protective Extra-Low Voltage) and earth grounding of the
secondary side of the used transformers or earth grounding
of the system ground.
Earth grounding is prescribed to prevent unexpected start-
up of connected rotating/moving machines due to an
insulation fault and double earth grounding somewhere in
the plant.
The use of an earth leakage monitor is also possible to fulfill
PELV if earth grounding is prohibited.
When is EN60204-1 Applicable to Excel 800
Systems?
 Safety against electrical impact
EN60204-1 is not mandatory; this is because electrical
safety is provided by the use of SELV and transformers
according to standard EN60742.
 Safety against unexpected start-up of
rotating/moving machines
– If the application/plant does not contain machines that
can be harmful to the operator due to an unexpected
start-up, the standard EN60204-1 is not applicable.
If such machines are encountered, then EN60204-1 must be
followed. Grounding is required.
Appendix 1: System Protective Earth Grounding
Earth Grounding of EN60204-1 Applicable
Systems
If system protective earth grounding is planned, use a
►
cable as short as possible for grounding:
min. 1.5 mm² (16 AWG).
For connection details, refer to the following examples.
►
Example 1
Connecting a single transformer with multiple XCL8010
Controller Modules earth-grounded as per EN60204-1.
Connect earth ground to terminal 2 of the XCL8010
►
Controller Modules
XCL8010
XF.../XFL... XF.../XFL...
24
V~
1
24 V~
LINE
24 V0
Fig. 111 Connecting and earth grounding multiple
XCL8010 Controller Modules (single transformer)
81
XCL8010
XF.../XFL... XF.../XFL...
24 24 24
V~0 V~ V~0
2 1 2
NOISE-FREE EARTH GROUND
(ONLY ONE PER SYSTEM)
EN1B-0375GE51 R0910
XF.../XFL... XF.../XFL...