2N Lift emergency phone 2N LiftNet - Manual, 1446 v1.8.3 - Manual (Page 50)

Audio Unit
– Machine Room
2.4
50
Bus Connection
Remove the terminal board from the connector, connect the wires and replace the
terminal board. The connection polarity is arbitrary.
Warning
 Connection to different, e.g. higher-voltage, cables leads to damage or
destruction of the audio unit.
Caution
 The unit is powered via a 2-wire bus from the central unit. Unplugging of
the bus from the CU causes switching off of the unit.
Telephone Connection
Use the telephone set including the cable with telephone terminals that are part of the
audio unit delivery.
Caution
 The audio unit is not functional without a telephone set connected.
 Connecting a telephone set of different type may result in difficulties, such
as system failure.
Testing
To test the function, pick up the handset. If no other call is currently being made, you
can hear the machine room voice menu.
Lift Blocking Function Connection
Caution
 This function may be mandatory if the local applicable regulations require
so at the time of installation.
Blocking procedure: the contact opens whenever a telephone line fault is detected or
the LN batteries are low. Connect the contact to the appropriate controller input of the
lift or a group of lifts. The control electronics shall ensure that, upon contact opening,
the lifts that are in operation arrive in the nearest station and open the door. If the
audio unit is shared by multiple lifts, all lifts must stop the function identically.