Toshiba LF434 - Manual (Page 134)

TOSHIBA
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12. Self-Diagnostics and Alarms
Self-diagnostic ítems and their error or alarm messages are described below,
IZ.l Self-diagnostics
Tlic LF404 converter lias a self-diagiiosties fnnetion to detect such problems as setting error,
I/O error or converter hardware failure and shows the resulting error or alarm messages on
ihe LCD display (optional) or on the AF 1(10 hand-held terminal through the HART proiocol
communications. The error or alarm messages and their corrective actions are described
below.
■ Setting error
If you try to set the value or measuring unit out of the range specified for each item, one of
the following error messages appears.
Error message
De.^crlptien Corrective action
t R OVER SPEC.
Setting value exceeds the
allowable hii^h limit.
Try to set the value
within the specified
range.
* L. OVER SPEC.
Setting value goes below the
allowable low limit.
* R OVER C RATE
Counting rate exceeds the
allowable high limit.
* L. OVER C RATE
Counting rate goes below' the
allowable low limit.
t HIITI RNG ERR
Span Ls not appropriate for
mulli-rane;e configuration. Try to set tile span as
specified,
High and low limit alarms
If the flow rate reading goes out of the set range, one of the following messages
appears. If the higli or low limit alarm cnablc/disahlc status is set to OFF, its
alarm function (high or low) is disabled. See S.2.1S, "High and T j ^ w Limit
Alarms.”
Alarm message Description Corrective action
R ALAM
Flow rate reading exceeds
the high limit. Arrange so that the
reading stays below
the high limit._______
L. ALARM
Flow rate reading goes below
the low Jiniit, Arrange so that the
reading stays above
the low limit.
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