15
…always there
11 and AC Fail are made to terminals marked 9 though 12 of TB1 respectively.
The connections are made in exactly the same way as for alarm inputs 1 to 8.
For panels which provide relay contact outputs, the common of each relay should
be connected to an A+ terminal (TB2) on the STU. Either the normally open or
normally closed contact should be connected to the relevant STU alarm input
(TB1). For example, if the relay is energised in the alarm state, connect the relay
Normally Open contact to TB1 for a positive applied alarm or connect the relay
Normally Closed contact to TB1 for a positive removed alarm. Note: The A+
terminal provides four 10KO pull up resistors to V+. If more than four are
required extra 10KO resistors should be connected, one end to V+ and the other
to the relay common.
For panels which provide voltage outputs, each alarm signal should be connected
directly to the relevant STU alarm input terminal (TB1).
Un-programmed channels can be left unconnected. If any channels have been
enabled in the NVM, but are unused, these should be connected the ‘No Alarm’
state. The ‘No Alarm’ state will be 0V for Positive Applied inputs and +12V (or
V+) for positive removed inputs. This will prevent alarms being generated on the
unused channels.
Output Relays
Three output relays are provided: Control, Return Path Signalling (RPS), and Line
Fault. The use of any, or all, of these functions is optional. For a basic
installation these outputs are not required.
Note: If an output is to be connected to a device which produces transient
voltages, such as a bell, the device should be suppressed using a suitable
protection diode.
Control Output
The Control Output is a general purpose output which is controlled by the Alarm
Receiving Centre. It may be used for various functions including the remote
resetting of alarm panels.
The ‘Control Output’ relay contacts (Normally Open, Common, Normally Closed)
are available for connection on terminal block TB4. The relay contacts have a
maximum current rating of 1 Amp.
For plug-in installations, Control Output connections are made automatically
when the unit is fitted in the host alarm panel. The host alarm panel must be
programmed to enable this function (TELL BACK).
Return Path Signalling Output (RPS)
The RPS output is used to indicate, at the protected premises, that the
opening/closing signal has been sent to and acknowledged by the Alarm
Receiving Centre.
(6 paginas)
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