Vicon SVFT-C22, Installation And Operation Manual

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Typical Relay and Alarm Connections
Alarm input and relay output type signals are also carried on individually-shielded twisted-pair cable sets. The
signals are defined in the following descriptions.
Alarms 1-4 are electronic CMOS level type inputs that are driven by a dry contact type switch. These signals
are connected to terminal block TB2. Each input has two
states, open and closed. For example, in Figure 20, a
door switch can activate an alarm when connected to a
SurveyorVFT alarm input. As a guideline (under normal
conditions), the cable should be 22 AWG for a 1000 foot
(305 m) distance. The states correspond to defined TTL
designations as follows:
Figure 20
Typical Alarm Circuit
OPEN = HIGH and CLOSED = LOW
where: HIGH = 5 VDC and LOW = < 1 VDC
Since dry contact switches are normally defined in terms
of their inactive or “normal” state, the following holds
true:
NORMALLY CLOSED (NC) = ACTIVE HIGH (OPEN)
NORMALLY OPEN (NO) = ACTIVE LOW (CLOSED)
The “active” state can be programmed through the SurveyorVFT menu system. These signals are
connected to terminal block TB2. Alarm signals can be
programmed for their status (enabled/disabled), active
level definition (high/low), action/reset function (none,
preset, aux on, aux off or tour), acknowledgment mode
(automatic, momentary or manual) and report status
(yes/no).
Figure 21
Typical Relay Circuit
The relay output is an actual relay output dry contact,
which directly drives external devices (1.5 A @30 VDC
max). For example, a light can be turned on and off
when the relay output is connected to the light circuit.
Refer to Figure 21. The relay output contact can be
programmed for its power-on state definition (on/off)
and output type definition (momentary or latching).
There is one relay output dry contact located on
terminal block TB3. Connect the circuit to be switched
to the connector pins labeled RELAY C (relay
common) and RELAY NC or RELAY NO for a normally
closed or normally open connection, respectively.
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