Watlow Series 945, 1/4 DIN Microprocessor-BasedAuto-tuning Control - Manual (Page 27)

Tuning and Operating, Chapter 5 WATLOW Series 945 User's Manual
27
Error Code Actions
• Error codes Er 1, Er 2, Er 3, Er 6, or Er 7 will result in these conditions:
• If operator access is LOC 0 or 1…
…and the control was in AUTO operation when the error occurred, it goes into
manual (% power) operation. If the output power is less than 75% power, and
a <5% change in power occurred within the last two minutes, the 945 switches
into manual operation at the last automatic power level (bumpless transfer). If
the control was in manual operation, it remains there. (Press AUTO/MAN
twice to see the error code.) The alarm output (if present) is in its alarm state
(LED lit). The upper display reads "- - - -". The lower display indicates the
error code.
If the control was operating with stable output values when the error occurred,
it continues to operate at those levels on a % power basis. If output values
were not stable, the control outputs go to 0% power (OFF).
• If operator access is LOC 2 or 3…
The control remains in AUTO operation and the outputs go OFF. AUTO/MAN
and MODE are inactive. The UP/DOWN keys may be used simultaneously to
enter the Setup Menu. The alarm output (if present) is in its alarm state (LED
lit). The Upper display reads "- - - -". The Lower display indicates the error
code.
• To clear a corrected error…
• Cycle power or MODE through Setup until you return to the set point.
• Error codes Er 4 or Er 5 will result in these conditons:
• The control is in AUTO operation with both outputs OFF.
• The alarm outputs are in their alarm state (de-energized with the LED lit).
• The upper display indicates the process value.
• The lower display indicates the error code.
• All keys are inactive.
• All Setup Menu parameters return to default values.
• The above conditions occur regardless of the LOC value, or the presence of
the Setup or Calibration Menus.
• To clear a corrected error…
• Cycle power to the control.
Error Codes