User Manual

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Siemens Switzerland Ltd www.siemens.com/gamma 2019
Building Technologies Division
Output devices
Overview and selection guides
Binary output devices
The binary output devices from Siemens can be flexibly used in many
applications. The extensive product range for all standard loads
(AC1, AC3, AX, C-Load) includes modular extensible switching actu-
ators with integrated load current detection.
Usage of load types AC1, AC3, AX and C load
The industrial and building control sector have seen the establishment
of a range of different switching capacities and outputs. These tend to
be specific to the respective applications and are specified in the
corresponding national and international standards. The tests are
defined such that they reproduce typical applications, such as motor
loads (industry) or fluorescent lamps (buildings).
The AC1 and AC3 details are switching capacity specifications which
have become established in the industrial sector:
• AC1: refers to the switching of predominantly resistive loads
(p.f. = 0.8)
• AC3: refers to an (inductive) motor load (p.f. = 0.45)
These switching capacities are defined in the standard EN 60947-4-1.
„Contactors and motor starters – Electromechanical contactors and
motorstarters“. The standard describes starters and/or contactors,
which are originally used in industrial applications.
The designation AX has become established in building controls:
• AX: refers to a (capacitive) fluorescent lamp load
Switchable capacitive loads (200 F, 140 F, 70 F or 35 F), at a load
of 200F “C load”, and are mentioned in conjunction with fluorescent
lamp loads. This switching capacity refers to the standard EN 60669
„Switches for household and similar fixed electrical installations
– Particular requirements“, which is primarily implemented for applica-
tions in building control. For 6A devices a test with 70 F and for 10A
devices a test with 140 F is required. The switching capacity declara-
tions AC and AX are directly comparable with each other.
Modular switching actuators
The modular design of the GAMMA instabus switching actuators
guarantees the flexible design for each case of application. Up to four
switching actuator extensions can be connected to the 6-pin interface
on the main module using a jumper. In this manner, a 3-fold switching
actuator can be extended to 6/9/12 or 15-fold switching actuators and
flexibly adapted to the number and size of loads to be switched. The
variety of the functionality of the application software covers a broad
spectrum: Ranging from multistage fan control, operating hours and
switching cycle counters to scene control, thermal actuator control up
to load recognition and monitoring of load current per channel.
The extensive application program controls both the outputs of the
main units and the outputs of all connected expansions. This includes:
• Recording and monitoring of load current per output for load failure
or overload
• Detection of a significant equipment failure
• Preventive detection of failures due to continuous monitoring of the
current
• Detection of load circuit interruption
• Simultaneous switching of all three outputs
• Implementation of a rotational speed stated as a percentage, in 1 to
3-stage switching commands (fan speed control)
• Implementation of a valve position stated as a percentage in a pulse
width modulated switching command (thermal drive control)
• Switching operation and operating hours counter with limit monito-
ring per output
• Integrated 8-bit scene control, with each output assignable to up to
8 scenes
Diagram of 15-fold switching actuator
230 V AC
KNX
I202_01453
The depicted diagram is an example of schematic interconnection
and connection of individual switching actuator modules. All modules
labeled 10 AX, 16 AX and 20 AX are compatible and therefore can be
used together. Detailed information is available on our Internet page
with technical documentation: www.siemens.de/gamma-td
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