EN.IO.APC.APR.ALW
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Revision 02.A.005/2020.06
trigger an alarm I_AL<3,600 mA. The return of the pressure/differential pressure above the LPL
point will result in deactivating the alarm and returning the transmitter to its normal operation. In
case of transmitters in standard or Exi version, if the pressure/differential pressure value de-
creases to the lower limit of ADC measurement converting transducer, reaching the LSAL point,
the diagnostics will trigger an alarm depending on the configuration AL_L<3,650 mA or
AL_H>21,500 mA. The return of the pressure/differential pressure above the LSAL point will re-
sult in deactivating the alarm and returning the transmitter to its normal operation.
The transmitter diagnostics continually tests electric parameters and software resources of
transmitter:
−
if the inner diagnostics detects the malfunctioning or failure of the transmitter which are not criti-
cal with regard of integrity of hardware and software
– software of the transmitter in Exd or
Exi/Exd version will activate alarm I_AL<3,600 mA. The diagnostic alarm condition will continue
until the failure or damage is resolved. Error/failure number
Exxxx
will appear on LCD2; the
ERROR
message will be displayed on LCD3. The image will blink to attract the
operator’s atten-
tion. The transmitter will set the current output to alarm status I_AL<3,600 mA. In case of
transmitter in standard or Exi version, software will activate alarm depending on the configura-
tion AL_L<3,650 mA or AL_H>21,500 mA. The diagnostic alarm condition will continue until the
failure or damage is resolved. Error/failure number
Exxxx
will appear on LCD2; the
ERROR
message will be displayed on LCD3.
The image will blink to attract the operator’s attention;
−
if the internal diagnostics detects malfunctioning or failure of the transmitter which are critical
from the point of view of integrity of hardware and software, such as the hardware error of RAM,
FLASH, SVS, CPU logs, mathematical computation error, or if there is a difference exceeding
1% between the set process current and the current measured in the line, the transmitter will
immediately stop operation and activate the critical diagnostic alarm mode. The transmitter dis-
play will be switched off. HART communication with the transmitter will not be possible. In case
of transmitter in Exd or Exi/Exd version, in the critical diagnostic alarm mode the additional pro-
tection of the transmitter disconnects its power supply from loop 4...20 mA. In such a case,
alarm current I_AL is much lower than 3,600 mA and is less than 0,500 mA. The transmitter will
remain in OFF state until the power is disconnected and the transmitter is switched on again. In
case of transmitter in standard or Exi version, in the critical diagnostic alarm mode the additional
protection of the transmitter will lower the current in the loop 4
…20 mA. In such a case, alarm
current I_AL is much lower than 3,650 mA, amounting about 0,150 mA. The transmitter will re-
main in the critical alarm status for approx. 10 seconds, then it will attempt to restart. When the
internal diagnostics detects no hardware errors after restart, the transmitter will return to normal
operation.
9.2. Configuration of operating mode
Before starting the work with the transmitter, the following parameters must be configured:
−
basic unit of transmitter;
−
processing characteristics;
−
the beginning of the set LRV range;
−
the end of the set URV range;
−
damping time constant;
−
NORMAL/NAMUR analogue output operation mode;
−
analog output operation mode in alarm status AL_L/AL_H (applies to transmitters in standard or
Exi version);
−
alarm mode for indicating environmental events and defects;
−
transmitter tag (TAG/LONG_TAG);
−
LCD display configuration parameters;
−
setting of the settings change lock password.
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