DC Dimmers behaving inconsistently
Use shielded cable for the bell-press wires as per the DC Dimmer data sheet if multiple DC dimmers are connected to one switch and are behaving inconsistently.
LED’d not turning on at low intensity
If the LED lamps are turned off at a low intensity and turned on again, there could be a lengthy time delay before the lamps turn on, some turn on and some not. This occurs because the LED lamp is not designed to dim as low. Set the minimum intensity of the dimmer to suite the [...]
DC Dimmer power supply shuts down when initially powers up
When a DC dimmer is wired directly to an electronic transformer, some transformers enter protection mode during the initial power up. Generally, the cable length is < 100mm. You can extend the cable length between the power supply and DC dimmer by 100mm should this occur
More than one dimmer per wall box
There is no allowance in the IEC or SABS/SANS specifications for dimmers to be tested or qualified for more than one dimmer per wall box. It is however often desired to install more than one dimmer per switch box. In these cases it must be kept in mind that a dimmer does heat up the [...]
Dimmable MR16 LED’s flick or flash when turning off
This is a function of the transformer/MR16 LED interaction. Since the transformer is electrically situated between the MR16 LED lamp and the dimmer, the LED lamp does not react directly to the dimmer turning off as is the case with 230VAC LED lamps. The MR16 LED reacts to the voltage diminishing on the output of [...]
Dimmable MR16LED’s flick or flash when turned on at low light level
This is a function of the transformer/MR16 LED interaction. Since the transformer must first turn on using the LED lamp current feedback, the lamp and transformer reacts to the dimmer bus voltage once the lamp is stable. A flash or flick can sometimes be observed if the lamp is turned on below approximately 50% intensity. [...]
Dimmable MR16 LED’s dim too quickly at low light level
As in the case where some of the MR16 LED turn off, it was found that a number of electronic transformer and MR16 LED lamp combinations exhibit a dimming curve very similar to that of conventional halogen lamps. Some however do not and might dim very quickly at low light output. Activate the MR16 LED [...]
Dimmable MR16’s do not turn on
Most electronic transformers employ self oscillating methods which rely on the load current for oscillation, hence the characteristic minimum load requirements. Since LED lamps consumes much less power (current) than it's halogen counterparts, it could be that the lamp current is too little to initiate the transformer oscillation and hence turn on. This is especially [...]
When dimming down, the LED’s turn off
Although the dimmer did not turn off while dimming down, the LED's, especially some MR16's with electronic transformers, do turn off. This is once again a function of the control circuit electronics as above and/or the interaction and characteristics of the MR16/transformer combination. It was found that if the dimmer's lowest light output level is [...]
Dimmable flicker at low light output
There are many different types of control circuits employed in dimmable LED's. Some of the circuits or control IC's might not be able stabilise the LED at very low light output, especially in areas of low supply voltage. This however usually only occur at fairly low light output Dim to the lowest light level and [...]