Technical information

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Phase control (impulse) is a
simplified and economic version
of light control, using control-
lable HF-ballasts designed for
this function. Normally, these
ballasts can also be controlled
via a bus system such as DSI,
DALI or 1–10 V DC depending
on the brand and type. However,
the functions cannot be combined as this can result in considerable
damage.
Phase control (impulse) does not require a regulator or other con-
troller, the signal to the HF-ballast is obtained directly from a simple
momentary switch. Other additional modules are not required. In
eect, the regulator is integrated in the HF-ballast.
Only a four core cable to the luminaire is needed: Direct (un-
switched) mains voltage, neutral and protective earth as well as
the mains voltage (impulse) via the momentary switch. Control of
a luminaire mounted on a traditional connection box and requires
little change to the cabling.
Phase control (impulse) is also an ideal system when you want to
control a lighting system from several places in the room. Reliability
lies in its simplicity and the lack of intermediate units means instal-
lation is easy and inexpensive.
The control method can, depending on the brand, be combined
with other components such as daylight sensors. The Tridonic brand,
for example, oers interaction between phase control (impulse) and
the sensor SMART LS II. The pre-set lighting level is set using the mo-
mentary switch, to the required value. The sensor will then attempt
to keep the level constant around the new level. The lamp output
returns to the pre-set value once the luminaire has been switched
o and then on again.
Control switches can comprise of 250 V switches with normally
open contacts and impulse springs, or switches with a return
spring. When using such a switch, the luminaire is turned on and
o by quickly pressing and releasing the switch, while adjustment
of the illumination level, alternating up and down, is performed by
pressing and holding down the switch.
Alternatively a momentary switch can be used, where one button
regulates the luminous intensity up and the other down. The light-
ing can be switched on and o with either button.
Dimming
Phase control (impulse) – switchDIM, Touch DIM
Applies to Tridonic SwithDIM:
Unlimited number of parallel connected pushbuttons for on/o/ •
dimming can be installed.
A maximum of 25 PCA HF-ballasts are recommended in a switch-•
DIM installation.
Connection of the pushbutton phase and neutral to the HF-ballast •
is polarity free.
Note
Control switches must not be equipped with indicator lamps, as •
the leakage current from these cause malfunctions.
The maximum length for the control cable is normally unlimited •
as the signal is a 230/240 V signal impulse.
The same phase should be used for control as well as the power •
supply to the luminaire. This produces an unpolarised connection,
which means that the luminaire can also be equipped with a plug.
A 3-phase connection is also possible, but this requires a special
polarised connection.
Simultaneous use of phase control (impulse) and another control •
method such as DALI or DSI will cause irreparable damage to the
digital control equipment.
Avoid mixing dierent brands in the system.•
If a PCA HF-ballast with switchDIM is not synchronised with other
installed PCA HF-ballasts (ballasts on same circuit at dierent
phases on the upward/downward dimming cycle) the installation
can be synchronised by depressing the pushbutton for > 10 sec-
onds. All PCA HF-ballasts will then be synchronised at the 50 % level
whereupon the installation can be used again as usual. Synchroni-
sation can be carried out at any time during normal operation.
Absence dampening – new function
The new HF-ballasts from Tridonic PCA ECO and Excel can also be
used for dimming between a high level (occupancy) and low level
(absenteeism) via occupancy detectors. A perfect function for stair-
wells, corridors and culverts. Large amounts of energy can be saved
in this way, without extinguishing the light completely.
See the installation example on page 464.
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