Tuttnauer ELARA11-D, Technicial Manual

Page: 131 / 176

Page 130
Symptoms
Possible causes Check-
ups and tests
Corrective Action
High temp.
(ending)
During the 'Ending' stage
the chamber temperature
does not go below the
temperature defined in
parameter 'End
Temperature' for X minutes
(as defined in parameter
'Normal Temperature
Timeout')
Possible causes:
1.
Heating elements go
on working beyond the
required time.
2.
Faulty SSR or Analog
board. 3. Faulty
calibration of temp.,
pressure or faulty sensors of
temp and/or pressure.
If the problem persists, perform
the following with SSR, Analog
board, and temp/pressure
sensors:
a.
Test
b.
If this doesn’t help,
recalibrate.
c.
If this doesn’t help, replace.
High pressure
(ending or
exhaust)
During the 'Ending' stage
the chamber pressure does
not go below the
atmospheric pr 5
kpa after the time defined in
parameter 'Normal Pressure
Timeout'. Possible causes:
1. Heating element is
working continuously.
1
Pressure System is
not calibrated.
2
Exhaust valve does
not open due to mechanical
or electrical malfunction
(aulty I.O. board, faulty I.O.
board connection).
First, perform a new cycle. If the
problem persists:
2
Calibrate System.
3 Fix connection. If this
doesn’t help, replace faulty I.O.
board.
Other possible solutions are:
Replace faulty valve.
Replace the faulty solid state
relay.
Time error
At the end of the
'Sterilization' stage, the gap
between the 2 Main Board
system clocks is more than
4 seconds. Repeat the cycle. If the problem
persists, replace the Main Board.
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