Relay output alarm communication
Page 174 OmniTrax Product Guide
Relay ratings and settings
The dry contact relays are form C and are rated for 30 V @ 1 A max. In local control mode, the
relays remain active for an event’s duration or for the user-selectable relay Active Time, whichever
is longer.
The two coil mechanical latching relay operates like a two position toggle switch. Applying a pulse
to the appropriate coil changes the position of the relay’s actuator. Applying a pulse to the second
coil returns the actuator to its original position. When a relay changes state, it remains in that state
until a pulse on the second coil changes it back. Because the relay is latching, there is no
energized state, which conserves power. The relay contacts are labelled according to the non-
activated state. If you want a relay to open to signal an alarm condition, you connect to the
normally closed contact. If you want a relay to close to signal an alarm condition, you connect to
the normally open contact. Both relay contacts and the common are brought out to terminal block
T5.
AUX I/P (self-test) connections
AUX 1 and AUX 2 are voltage sensing inputs. The processor determines an input’s status via an
internal reference voltage. The contact closure inputs MUST be voltage-free. In local control mode,
you connect normally open (NO) momentary switch inputs to the Aux inputs. Figure 153:
illustrates
the relay output configuration and the self-test input wiring for the OmniTrax processor in local
control mode.
Local control mode wiring connections
You make the I/O wiring connections on removable terminal blocks. The terminals accept wire
sizes from 12 to 24 AWG, with a 6 mm (¼ in.) strip length.
Note The type and gauge of I/O wiring required depends on the length of the
cable runs and the installation environment.
CAUTION All I/O connections on the OmniTrax processor include lightning
protection (additional protection is available, and recommended). You
must provide lightning protection for the alarm annunciation equipment.
Note It is possible to use relay output alarm communications and setup a
Silver Network for maintenance purposes. This enables calibration,
maintenance and diagnostic access to your OmniTrax processors from
a central control facility.
CAUTION Disconnect the power before making the wiring connections.
The OmniTrax processor includes static sensitive components.
Follow proper ESD procedures when working on the card.
Install OmniTrax wiring inside conduit for added security.
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