2N Lift emergency phone 2N SingleTalk - Manual, 1514 v6.3.0 - Manual (Page 30)

Installation
– universal version
2.5
29
ST Telephone Line Connection
The ST works regardless of polarity or line parameters in a wide range (see Technical
Parameters). The line is connected to the LINE terminals. A great advantage of the ST
is that it needs no other power supply for its operation. Details on the ST connection
to PSTN, PBX and GSM gateway lines are available in the "ST Connecting Options”
section.
ALARM Button Connection
– Button control
Safety
 Make sure that the button is safe – the isolation distance must be 1.5 mm
at least and the break-down voltage may not fall below 1500V. The button
contacts may not be connected to any other circuits. In case the above
mentioned conditions cannot be met, use voltage control.
 Connect the button contacts to the ALARM terminal, leaving it in the low
position.
 The button can have both the switching and breaking contacts. With the
breaking contact, switch the ALARM INPUT jumper into position NEG.
ALARM Button Connection
– Voltage control
Tip
 12 to 24V DC voltage of any polarity can be applied. However, the source
must be backed-up in case of power outage.
 Slide the ALARM terminal out and put it in the upper position to ensure the
required isolation against the telephone line circuits.
 Activation is controlled by voltage connection/disconnection. If voltage
disconnection activation is used, switch the ALARM INPUT jumper into position
NEG.