LIP-ME20X User Manual
12
LOYTEC
Version 7.2
LOYTEC electronics GmbH
CAUTION
The same applies to 24VDC power supplies.
CAUTION
Functional Earth
Functional earth must be connected to the building’s protective earthing
(PE) system on the installation side.
CAUTION
Operating Voltage 24V AC/DC
The power supply must meet the requirements for SELV or PELV.
Permitted deviation of the nominal voltage:
At the transformer or power supply: 24V AC/DC -10 … + 10%
At the device: 24V AC or DC ±10 %
CAUTION
Specification for 24VAC Transformers
IEC: safety transformers according to IEC 61558 with double insulation,
designed for 100% duty cycle to supply SELV or PELV circuits.
U.S.: Class 2 circuits according to UL 5085-3.
For efficiency reasons, the power drawn from the transformer should be at
least 50% of the nominal load.
The nominal power of the transformer must be at least 25 VA. Using a
transformer of smaller size, the ratio of open circuit voltage to voltage at
full load becomes unfavorable (> + 20%).
CAUTION
Specification for 24VDC Power Supplies
Power supplies must be designed for 100% duty cycle to supply SELV or
PELV circuits.
U.S.: Class 2 circuits according to UL 5085-3.
For efficiency reasons, the power drawn from the power supply should be at
least 50% of the nominal load.