Manual LCO EXC3/ADV3 OTD | 03-2020 | 1.2 | en
Installation notes
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Function of the earth terminal
The earth connection is conducted as protection earth (PE). The LED Driver can be earthed via earth terminal or metal housing (if
device has metal housing). If the LED Driver will be earthed, protection earth (PE) has to be used. There is no earth connection
required for the functionality of the LED Driver. Earth connection is recommended to improve following behaviour.
In general, it is recommended to earth the LED Driver if the LED module is mounted on earthed luminaire parts respectively heat sinks
and thereby representing a high capacity against earth.
Avoiding residual LED glow on standby
Residual LED glow on standby may occur as a result of capacitive leakage currents from the LED module onto earthed luminaire parts
(such as the heat sink). This mainly affects high-efficiency LED systems with large surface areas installed in luminaires with protection
class 1.
The topology has been improved so that residual LED glow can be virtually eliminated by earthing the devices.
Avoiding the transfer of mains transients to the LED output
The transfer of mains transients to the LED output presents a problem for many LED Driver topologies currently on the market, and
TRIDONIC devices may be affected.
Voltage peaks at the input of the LED Driver may be transferred to the output of the device where they lead to differences in
potential between the LED output and earthed luminaire parts. These differences in potential may result in flashovers if the insulation
is inadequate or if the creepage and clearance distances are too small. Flashovers will cause the LED module to fail.
Earthing the LED Driver attenuates voltage peaks and reduces the likelihood of flashovers. The precise degree of attenuation
depends on the capacitance of the LED module with respect to earth. If voltages at the output are higher than 0.5 kV, it is mentioned
in the data sheet.
Electromagnetic interferences (EMI)
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LED glowing at standby
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Transmission of mains transients to the LED output
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I
NOTICE
If the LED Driver cannot be earthed or if earthing is not desired, residual LED glow can be minimised by adequate insulation (for
example by using heat-conducting double-sided insulation foil).
