24/44
Siemens
GMA..1 actuators with spring return
CM2Z4614en
Building Technologies
2018-01-11
The diagram shows the currents in the connecting lines for
one actuator
.
0 V
G0
AC 24 V
DC 24 V
AC/DC 24 V
AC/DC 24 V
G
Y1
Y2
GMA13..1
1
2
6
7
AC/DC 24 V
M
0.21 A
0.15 A
4
61
4G
0
6
en
AC 0.21 A
DC 0.15 A
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)
DC 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:
197 m at 1.5 mm
2
line cross section.
∂
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
2
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.
Operating voltage
Power
consumption
Perm. voltage drop for line
1 (G), 2 (G0)
AC 24 V
5 VA
4 % of AC 24 V
P&I diagram:
Conduction currents
Example:
Parallel connection of two
actuators
Modulating actuators
GMA16..1
Power consumption and
perm. voltage drop with
one actuator