KROHNE VFM 5090 EN User Manual

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LINE.INTR

N Mains power to the

instrument was interrupted.

This error is generated only when totalizer is on to
indicate that internal totalizer could not totalize flow
during period of the power failure.
Acknowledge & reset the error by keying in E

й и

* This text is displayed for a wide variety of errors and most of them are Fatal in nature. The nature of error is

beyond the scope of user (failure of IC or other hardware inside converter electronics etc.) We therefore
suggest the user to switch OFF power and then try again. If error message continues, call KHRONE
MARSHALL service.
nn = internal error number.

Type N indicates non fatal errors whereas F indicates fatal errors.

Measurement stops if any Fatal error is encountered. This means flow rate q = 0, current output to minimum

value 0/4 mA or to error value 2/22 mA (as per programming of current output), frequency output = 0Hz.

When errors are displayed during the measuring mode, “n Err” (n = number of errors) will appear in the 1

line. n gives the number of momentarily occuring errors that are displayed alternately with the actual measured
value.

Error messages disappear when their cause disappears.

5.5.2 Error messages in programming mode

Error in programming mode can only occur while entering any numerical value. When you enter numerical value
outside possible limits you get message “ nnnn.nnnn ” in 1

line and MIN. VALUE or MAX. VALUE in the 2

line (“MIN. VALUE ” if entered value is less than lower limit and “MAX. VALUE” if higher limit is crossed).
Note the message indicating permissible limit; then press the E key to continue.

5.5.3 Other Error messages

VFM 5090(I) signal converter does lot of mathematical computations to calculate various physical parameters and
other quantities. Math functions of the instrument software will generate errors for cases such as divide by zero,
square root of a -ve number etc. Such errors are never expected to occur in VFM 5090(I). If ( due to corruption of
memory data or in the unlikely event of a software ‘bug’) any math error occurs, instrument cannot function since
there is no simple recovery and it annunciates errors such as - HALTED - RUN.TIME.ERR then DEVIDE.BY O
or other math error message. All measurement functions are stopped, display continuously annunciates the same
message. In such a case switch OFF the mains supply and then switch ON again. If the same error occurs again
contact KHRONE MARSHALL Service.

5.6 Plausibility checks

These checks are carried out when operator leaves programming mode and desires to save the new configuration in
non-volatile memory. These checks detect whether the configuration as a whole is plausible or not. If any error(s)
are detected in plausibility checks, a new main menu level Fct. 4.0 PARAM.ERROR is automatically created. The
functions under PARAM.ERROR enable you to correct parameters which caused plausibility checks to fail. To
understand the concept, consider the following example :

Fct 3.1.1 NOMINAL.DIA is DN 50 & Fct. 3.1.2 K-FACTOR is 6250. Then operator changes Fct. 3.1.2
NOMINAL.DIA as DN 80 and attempts to save the configuration. Now the limits for K factor are 1740 to 2730
for DN 80 which are dependent on nominal diameter of primary. Since the K factor lies outside valid limits,
plausibility check will fail. Operator should then change the K factor under Fct. 4.1 K-FACTOR.. Thus when the
operator changes a menu function without changing other functions whose validity depended on the changed
function, the error gets trapped by the plausibility checks. Plausibility checks are designed to resolve all such
interdependencies, to ensure that the configuration as a whole is plausible to work with.