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WTC 600 LP / MP APPENDIX
Service Handbook 08.2004
3.5 Operating failures/failure messages
The control system is able to detect operating failures during
OPERATION and DISINFECTION
and to display them. Usually, the unit will be stopped if a failure occurs. However, operating
settings exist for the failures
CY EXCEEDED and HARDWATER which make it possible that
such a failure is only displayed without interruption of the production. During the operating mode
DISINFECTION, only a MOTOR FAILURE can be detected.
The different operating failures/failure messages as well as their reasons and consequences are
as follows:
Denomination Reason Consequence
CY EXCEEDED
Cy perm> LIM Unit switches off if ps LIM
high = switch-off
FORCED STOP
FORCED STOP active
Unit switches off
MOTOR FAILURE/HARD
WATER
MOTOR FAILURE/
LIMITENT CONTACT
active
Unit switches off
LACK OF PRESSURE
PRESSURE SWITCH active
Unit switches off
MAINTENANCE
When the preset maintenance interval is over, the LED display OPERATION starts to flash (but
only if control system is in the operating conditions
DISPOSAL, PRODUCTION ON,
CONCENTRATE DISPLACEMENT/FLUSH or DISCONTINUOUS RINSE. This alarm message
can only be switched off by a technician who has then to enter a new maintenance interval (see
item 4.4.4).
Besides the above mentioned failures also other types of failure exist. These are erroneous
calibration ranges (failure message on text display), internal system failures (flashing FAILURE
light) and initialization failures (EEPROM fail message in text display immediately after having
switched the system on or during operation). As these failures correspond to malfunctions which
the user cannot repair, the supplier has to be informed immediately if such failures occur.
ATTENTION !!! As an internal system failure will interrupt program run, failures will not be
monitored. Such a control system must not be used any more.