Dräger REGARD 3000 Mode D'emploi page 111

Application notes
Depending on the version, 2 or 4 physical Ports are available for each module. A
Port configured with a channel ID forms an input channel. Even so, unconfigured
and thus unused Ports occupy the corresponding number of Ports in the overall
system.
WARNING
Missing gas alarm
When supplying power to a connected transmitter over the 4-20 mA Input / HART
2/4 Ch module, note that the current consumption of the transmitter depends on the
cable length and the cross-section of the transmitter power supply cables. In very
unfavourable circumstances this may mean that the supply voltage approaches the
shut-down limit of the channel and the current monitoring limit will be exceeded with
a signal current. In this case, a measured signal can result in the shut-down of the
channel and thus to a module error that is also signalled via the SFR on the
Docking Station. This will suppress a gas alarm configured in this current range.
The same behaviour is also found with the connection of multiple transmitters for
the total current monitoring of a module for all channels. In the most unfavourable
case this may result in shut-down of the complete module and failure of the
associated channels.
► When designing the supply currents for the transmitters, the supply voltage per
channel must be at least 20 mA below the permissible channel short-circuit
detection current (500 mA) and at least 80 mA below the module short-circuit
detection current (2 A). In case of doubt, during commissioning the supply
current to the single channel and the total supply currents on all channels of the
module must be tested to ensure compliance with the above conditions.
HART
The HART
– Display of device/channel assets
Device errors and device warnings (e.g. Beam Block error, temperature
warning) from the transmitter are read out and displayed. This information is
helpful for detecting upcoming maintenance activities at an early stage.
– Transmitter diagnostics
If transmitter diagnostics is selected, the transmitter parameters (configurable)
are compared against the parameter values set in the module and any
inconsistencies are displayed.
– Configuration matching wizard
The wizard allows the transmitter parameters to be transferred to the module.
The module does not support HART
address must be set to "0".
The module is set as the Primary Master. This setting cannot be changed. If
another Master is to be used (e.g. HART
configured as the Secondary Master.
The HART
transmitters:
– Dräger PIR 7x00
– Dräger Polytron 7000
– Dräger Polytron 8x00
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Instructions for use
REGARD 3000
®
functionality
®
functionality includes the following features:
®
functionalities of the module are supported by the following
System components
®
Multidrop mode. The transmitter's Polling
®
manual control unit), this must be
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