Actuator Wiring (Two-Position); Actuator Wiring (Three-Position) - Siemens OpenAir GMA 1 Series Technical Basics

Line length for actuators
connected in parallel
Assumption
Actuators with two-
position control
GMA12..1 and GMA32..1
Actuators with three-
position control
GMA13..1
Power consumption and
perm. voltage drop with
one actuator
Siemens
Building Technologies
The following sections show how to determine the permissible line length and cross
sections for the various actuators based on examples.
The examples for actuators connected in parallel apply to the following arrangement:
L1
Controller
L1
The line resistances of L2 are equal and can be ignored for L1. Separately calculate the
permissible line lengths L2 for other connections (ring, star-like).
6.2

Actuator wiring (two-position)

Operating
Type
voltage
AC 24 V
GMA12..1
DC 24 V
GMA32..1 AC 230 V
Use the table or the formulas in chapter 6.1 to determine the permissible line lengths
and cross sections.
6.3

Actuator wiring (three-position)

Three-position actuators are supplied AC/DC 24 V via the supply lines 1 (G) and
2 (G0). The positioning signal current of about 8 mA is supplied via lines 6 and 7.
The table shows the main power consumption used to size the actuator lines as well as
the permissible voltage drop.
Power
Operating voltage
consumption
AC 24 V 5 VA
DC 24 V 3.5 W
GMA..1 actuators with spring return
G0
L2
G
G0
G
L2
G0
G
G0
G
L2
G0
G
G0
L2
G
Power Perm. voltage drop for line
consumption 1 (G) and 2 (G0)
5 VA
Χ
U/U = max. 8 % (4 % each per line)
3.5 W
7 VA Χ
U/U = max. 4 % (2 % each per line)
Perm. voltage drop for line
1 (G), 2 (G0), 6 (Y1), 7 (Y2)
Χ
U/U = max. 8 % (4 % each per line)
A1
A2
A3
A4
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2018-01-11