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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
DC 24 V
DC 0...10 V
DC 1 mA
GMA16..1
M
G0
G
Y
U
1
2
9
8
(DC 0...10 V)
DC 0.15 A
DC 0.15 A
DC 0.1 mA
4
61
4G
0
8e
n
Determining the line lengths for four actuators GMA16..1, GMA19...1 at
DC 24 V
supply. Only the DC currents in line 1 (G) and 2 (G0) determine the line sizing.
Line 2 (G0):
(max. voltage drop
1 %
)
Line 1 (G):
(max. voltage drop
4 %
)
∂
Consumption: 4 x 3.5 W = 14 W
∂
Line current: 4 x 0.15 A = 0.6 A
∂
Permissible single line length:
13 m at 1.5 mm
2
line cross section or
22 m at 2.5 mm
2
line cross section.
∂
Consumption: 4 x 3.5 W = 14 W
∂
Line current: 4 x 0.15 A = 0.6 A
∂
Permissible single line length:
141 m at 1.5 mm
2
line cross section or
235 m at 2.5 mm
2
line cross section.
6.5 Actuator wiring (Modbus RTU)
The damper actuators are supplied with a prewired connecting and communication
cable. All interconnected devices must be connected to the same G0.
Strand code
Strand color
Terminal code
Description
1
red (RD)
G
System potential
AC 24 V ~ / DC 24 V
⎓
2
black (BK)
G0
System neutral
6
violet (VT)
REF
Reference (Modbus RTU)
8
grey (GY)
+
Bus + (Modbus RTU)
9
pink (PK)
-
Bus - (Modbus RTU)
The operating voltage at terminals G and G0 must comply with the requirements under
SELV or PELV.
Safety transformers with twofold insulation as per EN 61558 required; they must be
designed to be on 100 % of the time.
P&I diagram:
Conduction currents at
DC 24 V
Example:
Parallel connection of four
actuators
Note
