Page 1
Service Instructions
for the MELAG Autoclaves
®
MELAtronic
23
Technische Änderungen vorbehalten
Page 2
Functional reliability and retention of value of
the unit depend on:
- The proper preparation of the objects to be sterilized
- The avoidance of rust film formation
- The attentive care of the unit
- The regular exchange of the distilled/demineralized
water
CONTENT Page
CONTENT PAGE..........................................................................................................................................................2
1 MALFUNCTIONS WITHOUT ERROR MESSAGE........................................................................................... 3
1.1 NOTHING SHOWN ON THE DISPLAY .....................................................FEHLER! TEXTMARKE NICHT DEFINIERT.
1.2 NO WATER FEED AFTER PRESSING THE SWITCH "WATER FEED"............................................................................ 4
1.3 NO PROGRAM START AFTER THE OPERATION OF THE "START" KEY...................................................................... 4
1.4 NO PRESSURE QUICK RELEASE AT THE END OF THE PROGRAM.............................................................................. 4
1.5 BAD DRYING/ RESIDUAL WATER IN THE CHAMBER............................................................................................... 4
1.6 TOO HIGH PRESSURE INDICATOR.......................................................................................................................... 5
2 MALFUNCTIONS WITH FAULT MESSAGE....................................................................................................5
2.1 FAULT MESSAGE "ERR1" ..................................................................................................................................... 5
2.2 FAULT MESSAGE "ERR2" ..................................................................................................................................... 6
2.3 FAULT MESSAGE "1999"...................................................................................................................................... 6
3 MAINTENANCE AND CONTROL INSTRUCTIONS FOR DOOR AND LOCKING COMPONENTS...... 7
4 APPENDIX ............................................................................................................................................................... 8
4.1 EQUIPMENT VIEWS............................................................................................................................................... 8
4.2 ARTICLE/ SPARE PART NUMBERS......................................................................................................................... 8
4.3 PIPING PLAN ........................................................................................................................................................ 8
4.4 WIRING DIAGRAMM............................................................................................................................................. 8
4.5 PROGRAM FLOWCHART........................................................................................................................................ 8
4.6 OPERATION OF THE ELECTRONIC CONTROLS "MELATRONIC" .............................................................................. 8
4.7 PARAMETER LIST.................................................................................................................................................8
4.8 OPERATING INSTRUCTIONS.................................................................................................................................. 8
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Serviceanleitung für MELAtronic®17/23
1 Malfunctions without error message
1.1 Nothing shows on the display
After switching on the autoclave at the power switch (21), the display is empty:
- Verification of the customer-side power supply
- Verification of the power circuit breaker (36), replace possibly defective circuit breaker, if there is a
renewed failure of the circuit breaker, then this means there is a short-circuit in the apparatus :
• Failure immediately when mains switch is activated: permanent short-circuit (mains switch /
wiring harness/ electronic control (20))
• failure when the switch "water feed" is activated: spool / connector socket solenoid valve
water feed (38) defective
• failure at program start or activation of the drying function: heating (42) defective
- mains switch defective: No voltage at the output of the switch when mains switch is activated
- Electronic control (20) defective (no display despite supply voltage on the connections N and L1)
No display after activating the mains
switch
Customer-side power
supply o.k.?
Circuit breaker
(36) defective ?
Supply voltage at the
mains switch output?
Supply voltage at
connections N and L1
of the electronics?
Electronic control
(20) defective
Ensure power supply
Mains switch
defective
Change circuit breaker
Repeated failure of
the circuit breaker?
Failure immediately upon
activation of the mains
switch?
Failure with activation of
the water feed switch?
• permanent shortcircuit
• power switch
• wiring harness
• electronic control (20)
Short-circuit in spool or in
the connector socket
solenoid valve "water feed" (
38)
Failure with program start or
activation of the drying
function ?
Short-circuit at
heating (42)
overheating protection
or at the
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1.2 No water feed after pressing the switch "water feed" ________________________
If there is no intake of water in the autoclave chamber after activating the switch "water feed" (19), check the
following possible causes:
• Solenoid valve "water feed" (38) does not open
- No power supply (water feed switch, wiring harness, connector socket)
- Solenoid valve spool defective (check magnetic force on spool with screwdriver, check spool for
electrical passage)
- Valve mechnically blocked (plunger sticks/ jams, open valve housing, clean valve)
• Tank filter (41) clogged (unscrew filter with jaw or ring wrench size 13 and clean and possibly replace
mesh filter insert, clean drillings in the filter housing)
• Filter water storage tank (27) is clogged (unscrew conduit (28) at the filter, withdraw and clean mesh
filter insert downwards, possibly replace, clean drillings in the filter housing)
Notice: Cleaning the filter without opening the apparatus and dismantling the piping can be attempted
by activating the switch "water feed" during a program sequence pressure at the manometer > 1 bar to
produce a pressure discharge on the water feed line. After completed pressure discharge, the program
must immediately be canceled manually.
1.3 No program start after the operation of the "Start" key
After activating the "Start" key no program start takes place - i.e. no display of "run":
• "Start" key (22) defective (when pressed, contact of the key must close)
• Cable connection to the electronic control (connection 5/6) interrupted
1.4 No pressure quick release at the end of the program _________________________
No quick pressure release takes place at the end of the program; the pressure indicator on the manometer
drops very slowly:
• The solenoid valve "pressure discharge" (52) does not open (currentless open):
- valve mechnically blocked (plunger sticks/ jams, open valve housing, clean valve)
- Voltage does not switch off at the end of the program, relay output of the electronic control
(connection 9/10) is defective
1.5 Bad drying/ residual water in the chamber __________________________________
To guarantee good drying, the loading and operating instructions in the operating instructions must be
observed. If residual water remains in the chamber at the end of the program, then drying is made difficult.
Causes for this can be:
• No quick pressure release takes place at the end of the program (see Section 1.4.)
• The tank filter (41) is clogged (see Section 1.2.)
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Serviceanleitung für MELAtronic®17/23
1.6 Too high pressure indicator ______________________________________________
In fault-free operation, maximum pressures of 1.4 bar with the 121°C program or 2.4 bar with the 134°C
program may not be exceeded. Causes for a too high pressure/ manometer display can be:
• Manometer defective:
- Traling pointer stiff, jumps to a too high value. Attention, at the beginning of the pressure
discharge phase, the trailing pointer can be shifted by approx. 0.1 bar higher due to
vibrations. This does not reflect a device error.
- Manometer display too high
• poor ventilation because the solenoid valve "pressure discharge" does not open during the ventilation
phase (see program sequence), see Section 1.4
• Temperature control too high
- temperature sensors (40) not completely in sensor capsule
- bad heat transfer from the sensor to the sensor capsule, assembly with the thermal
conductivity paste
- contact resistance at the sensor connection (1/3) of the electronic control
- temperature sensors (40) defective
- electronic control defective / possibly carry out another inherent regulation (see Appendix
"Operation control Melatronic Section "Inherent regulation")
2 Malfunctions with fault message
2.1 Fault message "Err1" ___________________________________________________
Trigger: After start of a program, the maximum heating-up time t3 up to achievement of the temperature
range (Sp1- H1 with the 121°C program or Sp2-H1 with the 134°C program) is exceeded
Possible causes for this error can be:
Operating error:
• Apparatus overloaded
• Switch "water feed" not activated, no water dosed
• Switch "water feed" not switched off
• Customer-side supply voltage too low
• door not firmly sealed (leaks)
Hardware errors
• Heating (42) defective (apparatus remains cold, check heating for passage)
• Solenoid valve "water feed" (38) does not close (water is pressed back over the water feed filter into the
reserve vessel, check with empty reserve vessel)
• Solenoid valve "pressure discharge" (52) does not close (permanent water outlet at the condensate line
(51))
- solenoid valve polluted, leaks
- spool defective
- no voltage at the solenoid valve (cable / plugs / output 9/10 of the electronic control defective)
• Vent nozzle (30) washed out (heating permanently on, standard temperature is not achieved)
• Spring-operated safety valve (49) untight, opens too early
• Overheating protection system (44) defective (switches too early, or permanently activated)
• Power switch (26) defective ( despite actuation, LED lights up, no output voltage )
• Electronic control (20) defective
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2.2 Fault message "Err2" ___________________________________________________
Trigger:
• After the start of a program, another program was selected on "program" switch
• A running program was manually canceled by simultaneously pressing the button "P" and "⇓"
• During of the sterilization phase the sterilization temperature T falls short or exceeds the permissible
temperatur range SP1-H1 < T < Sp1+H1 (for the 121°C program) or SP2-H1 < T < SP2+H1 (for the
134°C program).
• During a program sequence there was a power loss
Operation/ operating error
• The "program" switch (18) was pressed during a running program
• The mains switch was switched off during a running program
• A running program was manually canceled by pressing the button "P" and "⇓"
Device error:
• Water shortage during the sterilization phase:
- Leakage at the solenoid valve "pressure discharge" (52) or at the solenoid valve "water feed"
(38), see under "Err1"
- Vent nozzle (30) washed out
- Spring-operated safety valve (49) leaks
• Overheating protection system (44) defective (switches too early)
• Device-internal interruption of the power supply (intermittent contact)
• Temperature sensors (40) not completely plugged in the mount
• Power switch (26) defective, check for secure assembly on the baseplate
• Electronic control (20) defective
2.3 Fault message "1999" ___________________________________________________
Trigger:
Cable breakage or short-circuit at the input 1 and 3 (connection temperature sensors) of the electronic
control (20)
Device error:
• Intermittent contact at the sensor connection, inspection for secure screw connection at the input 1 and
3 of the electronic control
• Temperature sensors (40) defective (short-circuit / cable breakage)
Remark: After the removal of the cause of the fault, the fault message "Err2" is shown one time and must be
acknowledged.
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Serviceanleitung für MELAtronic®17/23
3__ Maintenance and control instructions for door and locking components
In order to prevent premature wear, the threaded spindle of the star knob as well as the hinges of the lock
yoke and the pressure locking bar must always be well greased
(Preferably with plain-bearing grease MELAG-Art. No.24355).
Following points are to be checked and possible defects eliminated:
• exccessive play in the hinge of the
lock yoke
• excessive play in the hinge
of the pressure locking bar
(door hanging)
• excessive play of the
threaded spindle of the
star knob ("clatter" of the
spindle in the latch bolt)
• clearly difficult operation
if the threaded spindle
Attention!
The pivot pins must be completely
inserted in the latch bolt or in the
hinge yoke of the pressure locking
bar (left side plug. Check the
retaining rings above and below
for correct seat.
• hard metal screwed out of the latch
bolt
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4 Appendix
4.1 Equipment views _______________________________________________________
see drawing (Z.-No. 23E_0_05 page 1 and 2)
4.2
Article/ Spare part numbers ______________________________________________
see drawing ( Doc.No.: 23Melatronic.xls )
4.3
Piping plan ____________________________________________________________
see drawing ( Z. No. 23E-0-04 )
4.4
Wiring diagramm _______________________________________________________
see drawing (Z.-No.: 23E-0-01, 23E-0-02)
4.5
Program flowchart______________________________________________________
see drawing ( Z. No. 23E-0-04 )
4.6
Operation of the electronic controls "Melatronic" ____________________________
see drawing ( Doc.No.: Melatronic_Bedienung.doc)
4.7
Parameter list__________________________________________________________
see drawing ( Doc.No.: Melatronic23_Parameter.doc)
4.8 Operating instructions __________________________________________________
see drawing (Doc. No. 17-23 Melatronic BA.doc)
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