Manuel technique (pdf, 1.81 MB) - Niko

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- The dimmer is provided with thermal protection. If the temperature runs up too high, the dimmer
is switched off (check whether the load is not too high). The dimmer automatically switches on
again as soon as the temperature has dropped sufficiently.
- The dimmer has a number of ‘error indication’ LEDs (see fig. 1), which indicate defects such as
over-voltage, overload and overheating.
- The 3 ‘error indication’ LEDs are located at the top left of the cover, with symbols: ‘I’, ‘U’ and
‘T’. The ‘load’ LED is located at the top left, with symbol ‘ ’.
Meaning of the LEDs:
1 LED ‘ ’ lights steadily. —> Load is switched on.
2 LED ‘I’ blinks. —> overload
This may occur if the dimmer is overloaded or in case of switching-on peaks.
3 LED ‘U’ lights steadily. —> single over-voltage
4 LED ‘U’ blinks. —> repetitive over-voltage
Over voltage may have several causes:
- 230V mains power failure, either temporary or not;
- Magnetic transformer with excessive induction due, for instance, to insufficient load (min.
load of magnetic transformers 80%);
- Magnetic transformer with changed load (defective lamps not replaced in due time);
- Dimmer not set to correct mode, e.g. dimming of inductive loads in reversed phase control
instead of phase control mode
5 LED ‘T’ lights steadily. —> overheating
The temperature of the cooling surface exceeds 105°C.
6 LED’s ‘I’ and ‘U’ blink. —> DC voltage
7 LED’s ‘I’, ‘U’ and ‘T’ light steadily —> short circuit in load circuit
8 LED’s ‘I’, ‘U’ and ‘T’ blink —> Contact the Niko support service.
- Once the defect has been repaired, the dimmer can be restarted by briefly pressing the ‘select’
key or performing an operation.
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