OSRAM HALOTRONIC-PROFESSIONAL HTL - Manual (Page 13)

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3.12 Immunity to interference The units comply with the immunity requirements laid down in EN
(IEC) 6547. This means that they are protected against the external
influences of high-frequency fields, discharge of static electricity and
transient overvoltages in the mains supply, as defined in EN 6547.
3.13 Noise emission HALOTRONIC ® units are almost silent in operation. In a dimmed mode
noise could occur if e.g. mounted on a resonant part. In general a trai-
ling edge dimmer should be prefered for a quiet operation. E.g. under
worst case conditions (mounted on a wooden board), HT 70 L emits
a sound power level LWA of less than 0 dB (A) in undimmed mode.
Even in dimmed mode with a trailing edge dimmer in the least favou-
rable dimmer setting, the sound power level is normally less than 20
dB (A)
) .
By comparison, acceptable sound pressure levels are as follows:
• for a quiet living room: 35 dB (A)
• for an office: 35 dB (A)
3.14 Parallel/series HALOTRONIC ® units can be connected in parallel on the primary
connections side. In the case of the HT ... L, HT ... LF and HTM 50 models,
the second pair of terminals can be used on the primary side. The
maximal current must not exceed 6 A. In professional applications,
several units can therefore be connected to a single dimmer.
In contrast to conventional transformers, however, HALOTRONIC ®
transformers cannot be connected in parallel on the secondary side
because they would be overloaded.
Series connection to operate 24 V lamps is not permitted. Switching
or dimming on the secondary side is also not allowed.
Fig. 9
) Test set-up: dimmer located outside the room, measurements taken on one unit,
operation at maximum rated load.
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