Title: 36 Siemens GDB181-MO.pdf.pdf
Determine the transformer’s output by adding up the power consumption in VA of all actuators usedFor efficiency reasons, the power drawn from the transformer should amount to at least 50 % of the nominal loadFor efficiency reasons, the power drawn from the transformer should amount to at least 50 % of the nominal loadThe transformer’s nominal capacity must be at least 25 VA. With smaller transformers, the ratio of no-load voltage and full load voltage becomes unfavorable (> + 20 %)Fusing of AC 24 V operating voltageSecondary side of transformer:According to the effective load of all connected devicesLine G (system potential) must always be fusedWhere required, line G0 (system neutral) also8.2 Device-specific regulationsAmong other aspects, the safety of devices is ensured by extra low-voltage power supply (AC 24 V) as per SELV or PELV.