L-INX/L-GATE User Manual
22
LOYTEC
LOYTEC electronics GmbH
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.
CAUTION
Protection of the 24VAC Supply Voltage
Transformers must be protected on the secondary circuit, according to the
transformer dimensions and the effective load of all connected devices:
Always protect the 24VAC conductor (system potential),
Additionally protect the conductor (system zero) where required.