9 Lifecycle HIMax System
HI 801 001 E Rev. 4.01 Page 96 of 122
Sensor or Actuator
Field Termination Assembly
System Cable
Figure 19: Wiring 4 - Redundant Connector Board with System Cable
For wiring 4, connector boards of ´type 04 (e.g., X-CB 008 04) are required on the base
plate.
9.1.3 Earthing
Observe the requirements specified in the low voltage directives SELV (Safety Extra Low
Voltage) or PELV (Protective Extra Low Voltage. A functional earth is prescribed to improve
the electromagnetic compatibility (EMC). Perform this functional earth in the control cabinet
so that it meets the requirements for protective earth.
All HIMax systems can be operated with earthed L- or unearthed.
Unearthed Operation
In unearthed operation, one single earth fault does not affect the safety and availability of
the controller.
If several undetected earth faults occur, faulty control signals can be triggered. For this
reason, earth fault monitoring must be used in unearthed operation (see DIN EN 50156-1:
2005). Only use earth fault monitoring devices approved by HIMA.
Earthed Operation
Requirements for earthed operation are proper earth conditions and possibly separate
earth connection in which no external power supply flows. Only earthing of negative pole L-
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