Dimming actuator, 4-gang
KNX medium TP256
Commissioning mode S-mode
Rated voltage KNX DC 21 ... 32 V SELV
Current consumption KNX 15 mA
Connection mode KNX device connection terminal
7 Troubleshooting
Connected LED lamps or compact fluorescent lamps switch off in the lowest dimming position
or flicker
The set minimum brightness is too low.
Increase minimum brightness.
Connected LED lamps or compact fluorescent lamps flicker
Cause 1: Lamps are not dimmable.
Check manufacturer's instructions.
Exchange lamps for another type.
Cause 2: Dimming principle and lamps do not optimally match.
For HV-LED: Check operation in another dimming principle, reduce connected load as
well if necessary.
For LV-LED: Check the lamp operating device and replace as necessary.
With the "Universal" setting: Define the dimming principle manually.
Connected HV-LED lamps or compact fluorescent lamps in the lowest dimming position are too
bright; dimming range is too small
Cause 1: The set minimum brightness is too high.
Reduce minimum brightness.
Cause 2: HV-LED trailing edge phase control dimming principle does not optimally match the
connected lamps.
Check operation in the "HV-LED leading edge phase control" setting, reduce connected
load as well if necessary.
Exchange lamps for another type.
Output has switched off.
Cause 1: overheating protection has tripped.
Disconnect all outputs from the mains, switch-off the corresponding circuit breakers.
HV-LED trailing edge phase control: Reduce the connected load. Exchange lamps for an-
other type.
HV-LED leading edge phase control: Reduce the connected load. Check the operation in
the "HV-LED trailing edge phase control" setting. Exchange lamps for another type.
Let device cool down for at least 15 minutes. Check installation situation, ensure cooling,
e.g. provide distance from surrounding devices.
Cause 2: Surge protection has triggered.
HV-LED trailing edge phase control: Check the operation in the "HV-LED leading edge
phase control" setting, reduce the connected load as well if necessary.
Exchange lamps for another type.
The response of the surge protection can be signalled by sending a short-circuit telegram
or can be determined by polling the "short-circuit" communication object.
Cause 3: short-circuit in output circuit
Disconnect all outputs from the mains.
Eliminate short-circuit.
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82402712 10.07.2020
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