Technical information
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Dimming
Analogue 1–10 V direct voltage control (EN 60929)
The majority of dimmable
HF-ballasts are designed in
accordance with the standard
EN 60929 including the control
of HF-ballasts with 1–10 V direct
voltage. The HF-ballast creates
the requisite control current
itself and in the simplest form
a potentiometer (usually linear,
about 47 k) is enough for control. Most manufacturers’ potentiom-
eter controls also include electronics.
The HF-ballast senses the voltage in the control circuit. The
lower the voltage, the lower the lighting level. If the control circuit
is left open, the luminaire lights at full strength in the same way
as an non-controlled luminaire operates. If the circuit is closed the
lighting level drops to the minimum value. The minimum level of
luminous flux varies depending on the manufacturer, type and
light source. Normal minimum levels for linear fluorescent lamps
are 1–5 %, and 3–10 % for compact uorescent lamps. Check which
levels apply for the luminaire you are interested in.
Apart from the phase, neutral and protective conductors, two
other control circuit wires are connected to the luminaire. The con-
trol wires can be placed in the same conduit as the mains voltage
cable feeding the luminaire. Even if the control voltage is a maxi-
mum of 10 V the insulation on the control wires must conform to
the demands for a heavy current installation. You must ensure the
polarity is correct when connecting the control circuit as incorrect
connection can mean the installation drops to its minimum state.
Ensto Busch-Jaeger 2112
Rotary potentiometer for recessed installation. Suitable for
light control of a 1–10 V system. Integrated switch with
breaking capacity 4 A (cosf > 0.9). Avoid igniting/extin-
guishing more than 4 luminaires. Additional contactors
are needed when greater loads are ignited/extinguished. A
maximum of 50 HF-ballasts can be controlled.
Ensto Busch-Jaeger 2112
As to the left, but with surface mounted installation box.
Control units
Component Luminaire Breaking capacity
Ensto Busch-Jaeger 2112 recessed 50 4 A 86080
Ensto Busch-Jaeger 2112 surface mounted
50 4 A 86081
In addition to the control wires, the phase conductor should also
be connected via the control unit or combined potentiometer/
mains switch, as the luminaires can only be switched on and o via
the mains voltage. It is important to remember this when planning
the cabling, as changes to the installation may be dicult at a later
stage.
The breaking capacity of the potentiometer’s switch should be
taken into consideration during installation. Even if the potentiom-
eter is capable of regulating up to 50 HF-ballasts, the capacity of the
switch is usually 5–10 luminaires depending on their load. Contac-
tors are needed for greater loads.
Note
When selecting the control system you should take the system’s •
and luminaire’s compatibility into consideration. Luminaires
designed according to the standard EN 60929 feed the control
circuits themselves, which not all analogue control units permit.
There are special demands for running control cables in enclosures •
together with other high current cables.
The polarity of the control circuit must be maintained throughout. •
Regulation does not work correctly if the polarity is crossed on any
of the luminaires in a group.
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