Kistler-Morse KM ultrawave - Manual (Page 88)

error MessAges
For each error message, one or more possible explanations and suggested solutions are provided.
Note: Write down all existing system parameters before you change the Form or Units. If you change the Form or
Units you must adjust system parameters to correspond to the new Form or Units.
1. An exclAMAtion Point (!) on the disPlAy
Explanation: 77 Echo Loss/Mode allows you to select the echo loss indication mode — Timed or Temporary. If
you selected Temporary, the display shows an exclamation point (!) every time an echo loss is detected, even
if only momentarily. The display continues to show the last valid level (or flow) until the target is ‘found’ again.
Communications links, setpoints, and current outputs continue to operate normally, based on the last valid level.
77 Echo Loss/Timer allows you to set the amount of time from when an echo loss is first detected to when it
is reported on the display with an asterisk (*), reported over any communications links, and causes fail-safe
conditions (Echo Loss Mode) to apply for setpoints and current outputs. If an echo loss continues for Timer, the
exclamation point changes to an asterisk (*). Note that if Timed is selected, the display gives no indication of the
echo loss (no exclamation point) until the echo loss continues for Echo Loss/Timer.
Solution: Momentary echo loss will occur occasionally, due to noise, vibration, fill, etc. Set Mode to Timed if you
do not want to be notified of momentary echo loss.
2. An AsterisK (*) on the disPlAy
Explanation: 77 Echo Loss/Timer allows you to set the amount of time from when an echo loss is first detected
to when it is reported on the display with an asterisk (*), reported over any communications links, and causes
fail-safe conditions (Echo Loss Mode) to setpoints and current outputs. The display continues to show the last
valid level (or flow) until the target is ‘found’ again. The default for Timer is 60 seconds.
Solution: Echo loss will occur occasionally while filling. Other situations that can cause echo loss include foam
on a liquid. If echo loss frequently occurs, you may need to adjust power, Near 6 or TVG to improve the system
performance; contact Kistler-Morse.
3. A box (p) on the disPlAy
Explanation: A box (p) displays while vessel monitoring to indicate that the system senses a temperature greater
than 300º F (149º C) or less than -100º F (-73º C). The over- or under-temperature condition is most likely caused
by a short in the temperature probe. Current outputs and setpoint relays are put in a fail-safe condition (ELM)
and the temperature condition is reported over any communication links. When an over- or under-temperature
condition occurs, the controller uses 68º F (20º C), instead of the data from the temperature probe, to calculate
the level.
Solution: Verify if there is a short in the temperature probe. Replace the temperature probe if necessary.
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97-1163-01 Rev. D
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