Installing the FlexZone processor
FlexZone Product Guide
Page 55
Grounding
The FlexZone sensor requires a single ground reference. For standalone processors, PoE
powered processors, and processors that are connected directly to a network power supply,
connect the enclosure ground lug to an approved earth ground. For a connected block of
processors receiving power over the sensor cables, the processor that is connected directly to the
power supply provides the ground reference for the other processors (do not make ground
connections at the other processors). The earth ground connection should be stable and noise
free. An improper or unstable earth ground can induce noise in the FlexZone sensor.
Relay outputs
The FlexZone processor includes four Form C relay outputs available through a removable
terminal block. Each relay has a common connection to either a Normally Open (NO) or Normally
Closed (NC) contact. Each relay has an associated LED, which indicates when the relay is active
(LED ON = relay active). The optional relay output card includes four additional relays.
Relay contact ratings
The dry contact relays are Form C, latching, rated for 30 V @ 1 A max. In Remote control mode,
you can configure the relays as latching (ON by command, OFF by command), in flash mode (ON-
OFF-ON-OFF... by command, then OFF by command), or pulse mode (ON for a period, then
OFF). For flash and pulse modes, the relay Active/Inactive times are selectable. In Local control
mode the relays remain active for the event’s duration or for the selectable Hold Time, whichever
is longer.
Auxiliary inputs /Self-test inputs
AUX 1 and AUX 2 are voltage sensing inputs. The processor determines an input’s status via an
internal reference voltage, and the configuration of the contact closures and supervision resistors.
provides wiring diagrams for self-test and auxiliary device inputs. In Local control mode
the inputs activate an internal self test with AUX 1 activating the relays assigned to A Side cable
alarms and AUX 2 activating the relays assigned to B side cable alarms. In Remote control mode
the AUX inputs serve as auxiliary device inputs for reporting their status to the SMS. The optional
dry contact input card includes four additional inputs.
CAUTION
Consult the local electrical code for grounding information.
Do not use the fence structure as an earth ground.
Avoid sharp bends in the ground wire.
CAUTION
The contact closure inputs to AUX 1 and AUX 2 MUST be
voltage-free.
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