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Technical manual: SQUARE 940-2
DICTATOR Technik GmbH · +49 (0)821 246730 · [email protected] · www.dictator.de · 22.06.22
4.12 LIMIT SWITCH
The SQUARE 940-2 supports mechanical limit switches. The minimum requirement is three
switches, but four are preferable.
When using three switches, they must be used for “Open“, “Close“ and “Pre close“. Here the
“Pre close“ position is the reference.
The “Pre close“ limit should be set so that it is activated before the “Close“ position and remains
active the whole distance until the “Close“ position. All limit switches must be normally closed
(NC).
To set up the controller with mechanical limit switches, go to
Set Menu › System Setup › Position
Sensor › Type = Limit Switches
.
Function
Terminal
Pre open limit switch
X2.2
Open limit switch
X1.9
Unused
Unused
Close limit switch
X1.8
Pre close limit switch (reference)
X2.1
The limit switches marked in green
green are mandatory.
IMPORTANT
Unused inputs must be bridged to X5!
X1.8 + X1.9 must always be connected to tested inputs (X5.6 - X5.10).
Always ensure that the mains supply is disconnected when working on
the controller (p.18).
