4.1.3.3 Extra Low Voltage systems
SOMANET Drives are in the Extra Low Voltage (ELV) category. ELV voltage range is not life-threatening.
According to the standard for Adjustable speed electrical power drive systems (IEC 61800-5-1:2017), devices
with an input voltage lower than 25 V:sub:AC and 60 V are in the DVCA category.
Note
PE connection is not required for the DVCA category.
ELV devices are usually fed by batteries or switching power supplies.
In some cases an earth connection can not be used, for example in mobile robotics.
DC
4.1.3.4 SELV, PELV, FELV power supplies
Switching power supplies are widely used as a DC source for many applications in the ELV range.
Three categories of switching power supplies can be distinguished that are applicable for servo drives: PELV,
SELV or FELV. They differ in their isolation:
FELV (Functional Extra Low Voltage): No special insulation is required. The load is not isolated by
grounding.
PELV (Protected Extra Low Voltage): Special isolation is required. The load is not isolated by grounding.
SELV (Separated or Safety Extra Low Voltage): Special isolation is required. The load is isolated by
grounding.
PELV is usually sufficient to meet the requirements. SELV is used where extra isolation is required (e.g.
swimming pools).
Attention
SELV power supply can be violated if the equipment is using a common DC bus.
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