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MAN0443.P65 Issue 13 Aug 04
5701 Control System
05701-M-5001 A02279
CHAPTER 10 -SPECIAL CONDITIONS FOR SAFE USE ACCORDING
TO EC-TYPE EXAMINATION CERTIFICATE BVS 04 ATEX G 001 X
The following special properties have to be considered at operation of
the control unit:
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When operated with remote sensors with 4-20 mA
interface the specifications of the 4-20 mA interface and
the behaviour below 4 mA and above 20 mA have to be
considered.
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The parameters “A/D-average” and “signal filter” shall
be set to the sensor-specific default values. Other
settings shall only be used in exceptional, justified
circumstances and with the manufacturer’s permission.
For both parameters, the lowest settings shall be used
which are possible for the application.
-
When configuring the control cards, the sensor specific
default settings should be used for the error codes
“ER80”, “ER81”, “ER87” and “ER88” (parameters
“signal over range”, “signal under range”, “fault over
range” and “fault under range”).
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The error codes “ER87”, “ER88” and “ER81”
(parameters “fault over range”, “fault under range” and
“signal under range”) shall be set latching.
-
When operated with remote sensors (e.g. Sensepoint)
which may deliver signals within the measuring range at
concentrations above the measuring range, the error
code “ER80” (parameter “signal over range”) shall be
set latching. If the parameter is set below the default
value all alarm relays shall be configured in such a way
that alarming also takes place in the presence of sensor faults.
-
For remote sensors with 4-20 mA interface the parameters
“signal over range” and “fault over range” shall be set in
such a way that during normal operation (including the
application of 100 % gas to the remote sensor) “ER80”
can be activated but not “ER87”.
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The analogue outputs should be operated with live zero
(4-20 mA setting). The “< 4 mA clipping” feature should
be activated only in exceptional cases.
