Title: 36 Siemens GDB181-MO.pdf.pdf
The chart below applies to AC 24 V operating voltage and shows the permissible cable length L as a function of power P, and the cross-sectional areas as a parameter.L [m] 300n e 1 0 D 4 1 6 42002.5 mm²0.75 mm²1 mm²1.5 mm²1000.5 mm²0P08162432[VA, W]The values in [VA, W] on the P-abscissa are allocated to the permissible voltage drops (DU/2U = 4 %) on line length L as per the above table and the basic diagram.P is the decisive power consumption of all actuators connected in parallel.DU/2LRLUU-DUMRLDU/2L9 0 D 4 1 6 417 / 40VAV Compact Controller Modbus RTUA6V10631862_en--_d 2019-09-13Formula for cable lengthExample: Power consumption and permissible voltage drop (1 VAV controller)Example: Parallel connection of 4 actuators18 / 40Siemens Smart InfrastructureThe following formula can be used to calculate the maximum cable lengths.Operating VoltagePermissible voltage dropFormula for cable lengthAC 24 V4 % of AC 24 VL =1313 ·