User Manual

Safety notes
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CAUTION
Transformer specification AC
24
V
IEC: Use safety insulating transformers as per IEC 61558 with double insulation
designed for 100% duty to supply SELV or PELV circuits.
USA: Class 2 circuits per UL 5085-3
Power taken from the transformer should be at least 50% of nominal load for
efficiency reasons (effectiveness).
Transformer nominal power should be at least 25 VA. For smaller transformers,
the ratio of open circuit voltage to full load is unfavorable (> + 20 %).
CAUTION
DC 24 V power
supply specification
Designed for 100% duty to supply SELV or PELV electrical circuits.
USA: Class 2 circuits per UL 5085-3.
Power taken from the transformer is at least 50% of nominal load for efficiency
reasons (effectiveness).
CAUTION
Operational voltage fuse
AC 24 V
Transformers on the secondary side correspond to the actual load of all
connected devices as per transformer sizing:
AC 24 V line (system potential) must always be fused.
Where required, also fuse line ⊥ (system neutral).
CAUTION
Operational voltage fuse DC 24 V
DC 24 V power are short-circuit proof or have internal fuses.
Comply with all local regulations.
CAUTION
Mains fuse
Transformers / DC 24 V power on the primary side: Panel fusing (control fuse)
CAUTION
Power over Ethernet (PoE) PoE
Desigo touch panels require power for PoE+ Class 4 (max. 600 mA / 25.5 W). It
must comply with IEEE 802.3at-2009.
Comply with manufacturer guidelines on power to the PoE switches.