Problem
Possible causes
Resolution strategy
can be transmitted from the drive
to the fitting/valve that needs to
be moved without any external
impediment or torsion
Power supply connected to the
wrong poles
Swap the wires: 1 must be con-
nected to (−, N) and 2 to (+, L)
Drive does not work LED is flash-
ing red
Drive was installed at a temperat-
ure < -20 °C and has not yet
reached its minimum operating
temperature of at least -20 °C
Ensure there is a constant voltage
supply to wire 1–2
Wait until the necessary operat-
ing temperature has been
achieved by the drive’s internal
heating. The drive starts to work
independently
Y-drive cannot start intermediate
positions in 3-point mode
The switch from continuous
mode to 3-point mode has not
been made
Set the drive parameters in ac-
cordance with the installation
guide
Drive is in a skewed position on
the square damper shaft
The drives have an angle of rota-
tion of 95° incl. 5° pre-tension-
ing. The pre-tensioning was not
taken into account during install-
ation
Remove the drive from the
damper shaft, use the Allen key
to manually raise it by approx. 5°
before placing it on the damper
shaft for attachment. Follow the
installation guide!
A Y-continuous drive which
works with a restricted angle of
rotation reaches its final positions
already at > 0 V / 4 mA or < 10
V/20 mA
No adjustment of the angle of ro-
tation was made during commis-
sioning
Adjust the angle of rotation in ac-
cordance with the installation
guide
LED flashes irregularly, drive is
not operating
Drive unit is not receiving suffi-
cient supply voltage
Increase the wire cross-section or
the voltage at the transformer/
power supply output
Wiring too long, excessive drop in
voltage in the supply cable
Increase the wire cross-section or
the voltage
Only for size S:
Spring-return function is 10 s/
90°, but should be 3 s/ 90°
Bridge 2–5 missing
Bridge wire 2 for the constant
voltage supply with wire 5
Spring-return function is 3 s/ 90°,
but should be 10 s/ 90°
Bridge 2–5 installed
Remove bridge
8 | Troubleshooting
Translation of the original installation guide · Version 1.0 · 2021-05-27
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