Dräger REGARD 3000 Mode D'emploi page 118

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Installation and commissioning
– An interference-resistant earth connection and/or equipotential bonding
connection must be available for connection of the different system components.
– Unless otherwise specified, only devices or parts that conform to the
requirements of a SELV current circuit (safety extra-low voltage) as per IEC
60950-1 may be connected to the available interfaces.
– During installation, make sure that the ventilation openings are not covered and
that unimpeded ventilation during operation is ensured.
– REGARD 3000 has been tested for vibration resistance in accordance with the
applicable standards. When selecting the place of installation, make sure that
vibrations, as can typically occur in a control room, are not exceeded.
– Dräger recommends installation of control and transmitter lines separately from
energy supply lines.
– External equipment (e.g. horns, fans, contactors) must conform to the applicable
EMC guidelines and must have interference suppression.
– Dräger recommends the use of shielded cables for connecting transmitters.
– Depending on the earthing concept of the individual system, the shield with the
functional earth on the Docking Station or on the earthing connection must be
connected to the transmitter. The placement of the shield on both sides can lead
to earth loops and signal faults.
– REGARD 3000 does not support dynamic status signals from transmitters.
Transmitters must be configured for static status signals (see instructions for use
of the transmitters).
– Use shielded cable for all Modbus connections in the REGARD 3000 system.
– Use shielded Cat 5e cables for all Ethernet connections in the REGARD 3000
system. The maximum cable length is 100 m.
– Keep the REGARD 3000 Ethernet network separate from process, automation
and office networks.
– Constant monitoring of functional integrity must be ensured by the optical and
acoustic signals or the relay wiring.
– The operator is responsible for ensuring that short circuits and disconnections in
the SFR's wiring are detected or lead to a safe failure.
– To avoid loss of contact in environments with considerable vibration, use relays
with Normally Energized or Normally Open NO outputs. This also applies for the
non-configurable relays on the Docking Station (SSR, pre-alarm relay, main
alarm relay), which are Energized on Alarm.
– The electrical network in which the REGARD 3000 is installed must have a
circuit breaker or fuse.
– The circuit breaker or fuse must be easily accessible and must be clearly
marked as belonging to the REGARD 3000.
– The design of the system must also take into account the response times of all
components in the alarm chain (transmitter setting times t
of evaluation system).
– The maximum line resistance when operating 2-wire transmitters depends on
the type of transmitter that is connected, but must not exceed 300 Ohm per line.
– The maximum line resistance when operating 3-wire transmitters is calculated
based on the following formula:
R
118
< (262 ohm x 3.6 mA) / (I
L
+ 24 mA - 2 x 3.6 mA)
T
Instructions for use
/t /t , reaction time
20 50 90
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REGARD 3000