Copyright © 2000 Tunstall Group Ltd.
Lifeline 4000 Advanced User Guide (B)
71
Hardwired output
The output is intended to switch a relay, although it can also be used to control other types of
switch, such as optical switches. In other words, the Lifeline Home Unit output can switch small
voltages, although these small voltages and currents can be used to control larger switches. The
key points are as follows:
1.
The output does not provide a voltage of any sort—it simply makes or breaks (closes or
opens) a circuit.
2.
There are three contacts for the output. These allow you to create a circuit that is normally
open or normally closed (i.e. the output is a change-over relay).
3.
If the circuit connected to the output is DC (direct current) then the maximum current is 1A
and the maximum voltage is 30V.
4.
If the circuit connected to the output is AC (alternating current) then the maximum current
is 300mA and the maximum voltage is 125V.
5.
The output circuit needs a minimum current of 10uA, and a minimum voltage of 10mV
(DC), otherwise the Lifeline Home Unit may not switch it reliably.
If you exceed the maximum specifications set out in points 3 and 4 above you will probably burn
out the change-over relay in Lifeline Home Unit, although the damage may not be limited to just
this.
Under no circumstances should any Lifeline Home Unit ever be used to directly switch mains
voltages.
1 2 3
This symbols shows you which
contacts are normally connected
when there is no output
Output off.
When there is no output there is no connection between connectors 1 and 2. However,
there is a connection between connectors 2 and 3.
Output on.
When there is an output this situation is reversed—there is a connection made
between connectors 1 and 2, while the connection between connectors 2 and 3 is lost.
Содержание Lifeline 4000
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