SOMFY J4 WT - Neutral Conductor Connection in KNX Systems; Neutral Conductor Requirement; Neutral Conductor as Measuring Point; Mains Cut-off Operation

Autor: WN/StS,NC,TB
Info Nr. 2011 / 045
Datum: 15.03.2018
Vers. 1.5
I2011_045V5 Ansteuerung WT-Antriebe DE_EN_FR.docx Seite 4 von 6 06.12.2018
10. With many actuators, in particular in KNX (EIB) systems, the neutral conductor must
be connected to the corresponding actuator / motor output.
See image.
The neutral conductor connection on the actuator serves as a necessary measuring
point. In this case, every N-terminal (measuring point on the actuator) and every
drive neutral conductor must be routed on neutral conductor potentials (N rails).
The actuator manufacturer’s specifications take priority!
11. WT series drives cannot be operated with mains cut-off.
Additional information for blinds manufacturers:
Type J4 18 WT drives may not be operated via an isolating transformer or with a network
frequency greater than 63 Hz.
Knowledge database
Search terms: WT, BUS, WT drives, BUS control, EIB, LON, KNX, solid
state relay, reset, leakage currents, operating guidelines, isolating trans-
former, parallel connection, connection cable, capacitive coupling
Observations
Solution
End position detection is not used
Problem: motor is supplied with voltage in both directions of rotation (prog. mode)
End position detection
Up
Up
KNX actuators with electronic end position detection
KNX actuators with electronic end position detection
End position detection
Neutral conductor is connected
Problem solved: motor is only supplied with voltage in one direction of rotation
Down
Down