F&F STR-421 24 V Manual page 6

Mounting
1. Disconnect power supply.
2. Mount the controller on a rail or in a distribution box.
3. Connect the power supply wires to terminals 1-3 as marked.
A group of controllers working with a common central
control must be supplied from the same phase, e.g. L1
only.
4. Select the control option („+/~" or „-/~" pulse). Connect the
local control and central control switches, respectively, to the
terminals of the controller according to the function and to the
selected wire (for DC supply to the „+" wire; for AC supply to
one common „~" wire).
All control inputs of controllers working individually or
in a group must have a common control pulse option „–"
all controlled from the „+" (DC) wire or all from the same
„~" (AC) wire.
When selecting the DC power supply option, a „+" pulse
from the same power source (e.g. transformer) must be
applied to the control inputs.
Connecting to the control inputs of the receivers voltage
from another power source (e.g. from another transfor-
mer) may cause incorrect operation of the system and
lead to an electrical short in the installation and to the
destruction of the controllers.
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