94
OUTPUT
These warnings occur where the converter is trying to drive a signal on either the current or
frequency output which is outside the selected range. For example: Max flow = 10kg/min but
actual flow is 15kg/min. If the current output was set for mass flow then it would saturate at
20mA (10kg/min) plus over-range. Saturation of the outputs in this way may or may not be a
problem for the operator, so it is optional as to whether a warning is set or not in this case. (If
required, the process alarm could be used to indicate independently the saturation of the
outputs). In addition, if the Process Alarm is used to detect that a measured value is out of
range then this also generates an output warning.
SEVERE
These include any fault that causes the primary head to stop vibrating. This may be due to
large quantities of air in the process fluid or to poor clamping of the instrument. Severe errors
may also be due to a hardware fault. The instrument will restart as soon as the fault clears.
FATAL
Fatal errors indicate a major fault with the converter. In this case the converter stops
completely and then tries to restart as if it had just been switched on. Normally such errors will
require repair by service personnel.
Viewing and acknowledging warning messages
Whenever a warning occurs the display will start to flash and the status arrow on the display
will be set. The flashing display enables the operator to see from a distance that a problem
has occurred. The operator can now inspect the list as follows:
Begin from measuring mode.
If the operator selects "QUIT YES" the status arrow will disappear if the causes of the warning
have themselves cleared. However, if for example the mass flow is still too large, then the
arrow will remain. On returning to the measurement, however, the display will have stopped
flashing. This shows that the warnings have been acknowledged by the operator even if it was
not possible to clear them. In this event, the flow rate should be reduced and "QUIT YES"
selected again.
The user can control the level of warnings from Fct.1.2.2. This menu also allows the warning
to be viewed directly from within the measurement mode if desired.
Key
Display
line 1
line 2
↵
CodE 2
- -
↑
CodE *
-
→
RESET MASS
↑
MSG. LIST
→
≡
2 Err
≡
MASS FLOW
(Flow > 2 x Nominal tube flow)
The "
≡
" symbols indicate that
this warning has not previously
been acknowledged.
→
2 Err
I1 SAT
(Current output saturated)
↵
QUIT (YES)
↵
MSG. LIST
