ABB i-bus
KNX
Device technology
SA/S | 2CDC 505 056 D0208 43
Example
ABB i-bus
®
ballast 1 x 58 CF
Peak inrush current I
p
= 33.9 A (147.1
µ
s)
For Switch Actuator SA/S 4.16.6.1 this results in:
maximum number of electronic ballasts/output = 600 A/34 A = 17 electronic ballasts
This number has been limited to 12 electronic ballasts in conjunction with a B16 miniature circuit
breaker. If more electronic ballasts are connected, the miniature circuit breaker may trip during switch
on.
For Switch Actuator SA/S 4.6.1.1 this results in:
maximum number of electronic ballasts/output = 200 A/34 A = 5 electronic ballasts
2.9
AC1, AC3, AX, C-load specifications
In Intelligent Building Control, different switching capabilities and performance specifications, required by
special applications, have become established in industrial and residential systems. These performance
specifications are rooted in the respective national and international standards. The tests are defined to
simulate typical applications, e.g. motor loads (industrial) or fluorescent lamps (residential).
Specifications AC1 and AC3 are switching performance specifications which have become established in
the industrial field.
Typical application:
AC1 – Non-inductive or slightly inductive loads, resistance furnaces
(relates to switching of resistive loads, cos
= 0.8
)
AC3 – Squirrel-cage motors: starting or switching off during running
(relates to (inductive) motor load, cos
= 0.45)
AC5a – Switching of electric discharge lamps
These switching performances are defined in standard EN 60 947-4-1
Contactors and motor-starters –
Electromechanical contactors and motor-starters
.
The standard describes starters and/or contactors that were originally used primarily in industrial
applications.
The designation AX has established itself in the field of building services technology.
AX relates to a (capacitive) fluorescent lighting load.
Switchable capacitive loads (200
µ
F, 140
µ
F, 70
µ
F or 35
µ
F) are referred to in conjunction with fluorescent
lamp loads.
This switching capacity refers to standard EN 60 669
Switches for household and similar fixed electrical
installations – General requirements
, which deals primarily with applications in building services
engineering. For 6 A devices, a test with 70 µF is required and for devices exceeding 6 A, a test with
140 µF.
Summary of Contents for i-bus SA/S 2.6.2.1
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