Actuator Wiring (Modulating); Ac 24 V Supply - Siemens OpenAir GMA 1 Series Technical Basics

P&I diagram:
Conduction currents
Example:
Parallel connection of two
actuators
Modulating actuators
GMA16..1
Power consumption and
perm. voltage drop with
one actuator
24/44
Siemens
Building Technologies
The diagram shows the currents in the connecting lines for one actuator.
AC 24 V
0.21 A
1
DC 24 V
0.15 A
0 V
AC 0.21 A
2
DC 0.15 A
AC/DC 24 V AC/DC 24 V
6
AC/DC 24 V
7
Determining the line lengths for two actuators GMA13..1 and AC/DC 24 V supply.
Only the currents in line 1 (G) and 2 (G0) determine the line sizing.
Max. permissible voltage drop = 4% per line (total 8 %).
AC 24 V: Line 1 (G), 2 (G0)
∂ Consumption = 2 x 5 VA = 10 VA
∂ Line current = 2 x 0.21 A = 0.42 A
∂ Max. permissible single line length:
2
197 m at 1.5 mm line cross section.
6.4

Actuator wiring (modulating)

Differentiate between AC 24 V and DC 24 V to determine the permissible line lengths
between the positioning module and the actuator. The section below discusses the
effect of G0 line sizing.

6.4.1 AC 24 V supply

With AC supply, the G0 line has a AC 0.21 A supply current and a DC 0.1 mA
positioning signal current (from Y = DC 0...10 V). The AC voltage drop on the G0 line
does not impact the positioning signal Y.
Power
Operating voltage
consumption
AC 24 V 5 VA
GMA..1 actuators with spring return
GMA13..1
G
G0
M
Y1
Y2
DC 24 V: Line 1 (G), 2 (G0)
∂ Consumption = 2 x 3.5 W = 7 W
∂ Line current = 2 x 0.15 A = 0.3 A
∂ Max. permissible single line length:
281 m at 1.5 mm
Perm. voltage drop for line
1 (G), 2 (G0)
4 % of AC 24 V
2
line cross section.
CM2Z4614en
2018-01-11