ROMANOFF Yasui K2NEXT 8K User manual

VACUUM PRESSURE CASTING MACHINE
K2NEXT 8K
SKU: 79-300-K2-8KW
SINCE 1949
PRODUCT MANUAL

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Yasui K2 NEXT Instruction Manual SKU: SKU: 79-300-K2-8KW
CONTENTS
1. INTRODUCTION .................................................................................................................... 5
1-1. SAFETY PRECAUTIONS .................................................................................................5
1-2. SAFETY INFOMATION ....................................................................................................5
1-3. PASSWORD .....................................................................................................................9
1-3-1. KIND OF PASSWORD .............................................................................................. 9
1-3-2. ISSUE OF PASSWORD ...........................................................................................10
1-4. SPECIFICATION LABEL ................................................................................................ 10
1-5. PURPOSE ...................................................................................................................... 10
1-6. WORKING CONDITIONS ............................................................................................... 11
1-7. OTHERS ......................................................................................................................... 11
2. NOMENCLATURE ............................................................................................................... 12
2-1. MAIN BODY ................................................................................................................... 12
2-2. REAR PANEL ................................................................................................................. 13
2-3. FLASK CHAMBER ......................................................................................................... 13
2-4. MELTING CHAMBER ..................................................................................................... 14
3. PREPARATION BEFORE CASTING ................................................................................... 15
3-1. CHECKING POINTS BEFORE POWER ON .................................................................. 15
3-2. SETTING CRUCIBLE AND OTHER PARTS ................................................................... 15
4. OPERATION ......................................................................................................................... 16
4-1. OPERATION PANEL AND OTHERS ............................................................................... 16
4-2. POWER ON .................................................................................................................... 16
4-3. OPERATION ................................................................................................................... 17
4-4. SET PRESS Regulator ................................................................................................... 18
4-5. EMERGENCY STOP button ............................................................................................18
4-6. WINDOW AFTER START BUTTON ................................................................................ 18
4-6-1. LEFT SIDE OF WINDOW ........................................................................................19
4-6-2. RIGHT SIDE OF WINDOW ......................................................................................19
4-6-3. TOP OF WINDOW ...................................................................................................19
5. FLASK .................................................................................................................................. 20
5-1. FLASK COMBINATION .................................................................................................. 20
5-2. METAL SEALING DISK .................................................................................................. 21
5-3. O-RING CONDITIONS ................................................................................................... 22
5-4. CORRECT PLACEMENT OF FLASK ............................................................................. 23
6. MAINTENANCE ................................................................................................................... 24
6-1. CLEANING OBSERVATION WINDOW .......................................................................... 24
6-2. GAS CYLINDER ............................................................................................................. 24
6-3. CRUCIBLE AND STOPPER ........................................................................................... 24
6-4. FILTERS FOR CHAMBERS ........................................................................................... 25

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Yasui K2 NEXT Instruction Manual SKU: SKU: 79-300-K2-8KW
6-4-1. CLEANING ...............................................................................................................25
6-4-2. DISASSEMBLING FILTER UNIT .............................................................................25
6-4-3. CLEANING FILTER ..................................................................................................25
6-4-4. REASSEMBLING .....................................................................................................26
6-4-5. HIGH-DENSITY FILTER ELEMENT 5 micron (option) ............................................. 26
6-5. FILTERS FOR SENSORS .............................................................................................. 27
6-6. SCRAPER ...................................................................................................................... 27
6-7. LUBRICATION ................................................................................................................ 28
6-8. THERMOCOUPLE ......................................................................................................... 28
7. ADVANCED OPERATION .................................................................................................... 29
7-1. WINDOWS ..................................................................................................................... 29
7-1-1. ALL LIST tab ............................................................................................................29
7-1-2. TEMP tab .................................................................................................................31
7-1-3. SUC tab ...................................................................................................................33
7-1-4. PRESS tab ...............................................................................................................33
7-1-5. OPEN tab .................................................................................................................34
7-1-6. UPPER PART on CAST window ..............................................................................34
7-1-7. MEMORY REGISTRATION ......................................................................................38
7-2. SHOT tab ........................................................................................................................ 39
7-3. CONFIG tab .................................................................................................................... 40
7-3-1. MACHINE ................................................................................................................42
7-3-2. COPY/CLEAR ..........................................................................................................42
7-3-3. COUNTER ...............................................................................................................45
7-3-4. LANGUAGE .............................................................................................................45
7-3-5. SECURITY ...............................................................................................................46
7-3-6. PAYMENT PASSWORD ...........................................................................................48
7-3-7. DISPLAY ..................................................................................................................48
7-3-8. DATE & TIME ..........................................................................................................49
7-3-9. MAINTENANCE .......................................................................................................50
7-3-10. LOG & HISTORY ...................................................................................................51
8. TROUBLE SHOOTINGS ...................................................................................................... 52
8-1. ERROR MESSAGES ...................................................................................................... 52
8-2. ERROR CODE ............................................................................................................... 53
9. INSTALLATION ................................................................................................................... 55
9-1. PLACE ............................................................................................................................ 55
9-2. POWER SOURCE .......................................................................................................... 55
9-3. CONNECTING WATER HOSE ....................................................................................... 57
9-4. CONNECTING VACUUM PUMP .................................................................................... 58
9-5. SUPPLY OF INERT GAS ............................................................................................... 60
9-6. FLASK CHAMBER ......................................................................................................... 61

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Yasui K2 NEXT Instruction Manual SKU: SKU: 79-300-K2-8KW
9-6-1. REMOVING FIXATION BOLT FOR TRANSPORTATION ....................................... 61
9-6-2. CYLINDER ROD HEAD COVER ............................................................................. 61
9-7. THERMOCOUPLE .........................................................................................................62
9-8. CALIBRATION (Zero adjustment of pressure sensor) .....................................................63
10. SPECIFICATIONS ............................................................................................................ 65
11. PARTS & CONSUMABLES .............................................................................................. 66

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Yasui K2 NEXT Instruction Manual SKU: SKU: 79-300-K2-8KW
1. INTRODUCTION
1-1. SAFETY PRECAUTIONS
Three safety precautions are described in this instruction manual to avoid risks on human body
during operation. Be sure to read these precautions before using our products.
Each meaning as follows;
DANGER: Indicates a high-risk hazard. If this hazard is not avoided, it may result in severe
injury or even death.
WARNING: Indicates a medium-risk hazard. If this hazard is not avoided, it may result in severe
injury or even death.
CAUTION: Indicates a low-risk hazard. If this hazard is not avoided, it may result in a minor or
moderately severe injury. It also indicates a potentially hazardous situation. If it is
not avoided, the product or items in its immediate environment may suer damage.
1-2. SAFETY INFOMATION
This product contains high frequency oscillator and requires high pressure inert gas.
Therefore, perform daily maintenance well and operate very carefully and safely.
DANGER
High-voltage electricity is applied inside this product.
Do not open the panel unless instructed in this manual.
If the panel is accidentally opened while power is on, there is
a risk of injury or death from electric shock.
If you need to open the panel of main unit, be sure to turn o
power and unplug power cable from outlet even if the breaker
switch is turned o beforehand.
Otherwise hazardous voltage can cause an electrical shock,
burn or death.

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Yasui K2 NEXT Instruction Manual SKU: SKU: 79-300-K2-8KW
WARNING
1. Do not place fingers, hands, a part of body, or an article between lid and melting chamber or
between melting chamber and mold chamber when you press START button, Lid will move
downwards and mold chamber will move upwards to close with pressure.
As their pressing force to close is very strong, careless positioning of your fingers, hands, or any
other part of body can cause severe injury.
Particular care should be taken so that any other person, standing
close to you, should not place ngers, hands, any other part of body,
or an article between above-mentioned parts of chambers.
When you need to release lid or chambers, Press RESET button
immediately.
If you release START button before lid is completely closed,
the lid goes up to its original position.
If you release START button in one second after lid is closed, the lid goes up as well.
The lid or the chamber will not be released by EMERGENCY STOP button.
You need to push RESET button when you need to release them.
2. Do not put anything on lid.
Also do not place part or all of the human body on lid in the same way.
Otherwise lid xing shaft will be deformed by the excessive weight and no longer operated.
Also, the lid may be hot which can cause burns on human body.
Reset Start
CAUTION!

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Yasui K2 NEXT Instruction Manual SKU: SKU: 79-300-K2-8KW
CAUTION
1. Do not look into molten metal continuously for a long time. Eyes may suer eye sight disease.
Wear protection glasses.
2. Check that no crack or breakage is observed on crucible, outer crucible, before setting.
Do not push crucible body, or metal in crucible, strongly. When crucible has a crack, molten metal
may leak through it, resulting damage on this product.
3. Crucibles have their casting lives. Do not use a deteriorated crucible. Check condition of crucible
before use.
4. Do not leave this product unattended, while it is turned on.
5. When performing maintenance like replacing, or cleaning crucibles, heating coils, mold chambers,
and other parts which can be hot by heating, make sure that they have suciently cooled.
Otherwise operator may suer burns.
6. Do not place any material or tool on operation panel or on top cover of this product.
When lid is moved, an object may fall o and an unexpected accident may occur to this product and
operator.
Particularly, never place anything on operation panel because malfunction may be caused on LCD
touch panel and push switches.
WARNING
1. Do not use any antioxidant like typically known ‘borax’, any additives which behave as same, uxes,
sodium bicarbonate, silicone and others. Careful not to slip them into metal accidentally.
Most of them will create glassy contamination which clogs stopper holes or brings leakage of metal.
This product will suffer serious problem by this.
2. Do not use any materials which contain too much zinc, nickel and others which create lots of fume
when melting. They will attack your breathing apparatus.
3. Electromagnetic waves from this product may adversely influence medical equipment such as a
pacemaker or an implantable cardioverter defibrillator (ICD).
People wearing it should not be near this product.

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Yasui K2 NEXT Instruction Manual SKU: SKU: 79-300-K2-8KW
IMPORTANT
- Be sure to read this instruction manual and fully understand the contents before using it.
- The manufacturer shall in no event be liable for any damage resulting from improper use,
negligence to follow the warnings and cautions in the instructions manual or the labels on the product,
unskillfulness, use of non – original optional /consumable accessories / spare parts, non - authorized
modification.
- The manufacturer shall in no event be liable for any consequential or indirect damages including,
but not limited to, loss of production or loss of prot or damages due to machine downtime.
- Damages to the instrument and /or human bodies resulting from a crucible breakage or contacting
with high temperature parts are not compensated by the manufacturer.
- Damages resulting from delay of reaction at emergency and mistaken operation are not
compensated by the manufacturer.
- Damages by electrical noise, over voltage, or wiring error caused from an external vacuum pump
are not compensated by the manufacturer.
- Casting results by this product or by this manual are not compensated by the manufacturer.
- No part of this document may be copied or in any way reproduced without the expressed written
consent of the manufacturer.

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Yasui K2 NEXT Instruction Manual SKU: SKU: 79-300-K2-8KW
1-3. PASSWORD
1-3-1. KIND OF PASSWORD
Three kinds of password are prepared for the machine as follows.
1) Initial installation password
This password is necessary to release operation-lock of the machine at the time of installation.
0:00 a.m. of 4th day of the next month (Japan time) is expiration date of this password.
Unless final password is entered, new update password is necessary every month to use the
machine on and after this day. Operation will be locked from day 4.
Example of Initial installation password:
2) Monthly update password
In case this product is used by monthly use conditions, this password is necessary on or after the
first day of the month to which the next monthly calculation starting time belongs.
* Some of products and models do not have 'Initial installation password' but 1st password of
Monthly update.

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Yasui K2 NEXT Instruction Manual SKU: SKU: 79-300-K2-8KW
IMPORTANT
If you update before the first day of the month to which next monthly calculation starting time
belongs, monthly update subtraction counter is decreased by extra one month. Update should
be done on or after the first day of the month to which calculation starting day belongs.
3) Final password
When this password is entered and verified by the machine normally, the machine can be
operated without time-limit.
IMPORTANT
Once this final password has been verified by the machine, machine cannot be reset to the
monthly update password mode.
1-3-2. ISSUE OF PASSWORD
To issue next password in the case of use by monthly update password mode, the following
information is necessary.
Model name: K2NEXT 8000
Production Serial No. : xxx
Current monthly update history count: xx
1-4. SPECIFICATION LABEL
The principal specifications label of this product is afxed on the back side panel.
NOTE: When ordering spare parts, specify the production serial number that is printed on that label.
Apply power specified voltage printed on the label. Should any voltage exceed beyond the specified
voltage, the manufacturer is not responsible to guarantee performance of K2NEXT 8000.
1-5. PURPOSE
This product is designed for one of lost wax casting process; burnout molds for precious metal and
non-precious metal jewelry accessories.
This product has been developed for use in the manufacture of precious metal and base metal alloy

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Yasui K2 NEXT Instruction Manual SKU: SKU: 79-300-K2-8KW
products as accessories, and in the manufacture of some other precious metal base and non-ferrous
metal products (eyeglasses, apparel business, Japanese accessories, and general industrial parts).
Do not try for other purpose.
The manufacturer will not take any responsibility if not followed the purpose.
1-6. WORKING CONDITIONS
1) Use this product at temperatures ranging 0-40 degrees Celsius and humidity under 70%.
2) Apply power voltage 380 VAC, 50/60 Hz, 3 phase only.
3) Do not use this product under atmosphere with too much dust or with harmful gas.
1-7. OTHERS
1) Please note that K2NEXT 8000 is controlled by genuine computer which needs longer time for
starting up comparing with other electric equipment apparatus.
2) Please note that we have “half life period” on back up light for Liquid Crystal Display (LCD).
Actual half life period of display is approx. 3 years when you use it with 100% brightness.
K2NEXT 8000 is always shipped out with initial brightness setting 50% to save life time of back up
light.
You can also control its life by using suspend function.

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Yasui K2 NEXT Instruction Manual SKU: SKU: 79-300-K2-8KW
2. NOMENCLATURE
2-1. MAIN BODY
Breaker switch
SET PRESS regulator
EMERGENCY STOP
button
Height adjustment foot
Lid sliding knob
Observation window
for melting chamber
Melting chamber lid
Observation window
Melting chamber
Mold chamber
sliding knob
Fixture for shot maker
Flask up cylinder
Cover for cylinder rod
Lid lock cylinder
Mold chamber
Operation panel
Caster
Lid up cylinder
Carbon tray
Oil mist filter (melting chamber)
Oil mist filter (mold chamber)

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Yasui K2 NEXT Instruction Manual SKU: SKU: 79-300-K2-8KW
2-2. REAR PANEL
2-3. FLASK CHAMBER
Protection sheet
#14045500
Flask base
#14743000
Extention for short flask
#14031000
Pan
#14880411
Protection sleeve(K2 NEXT)
#14880412
POWER SOUCE
COOLING WATER
VACUUM
Ar GAS
BACKSIDE OF MACHINE

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Yasui K2 NEXT Instruction Manual SKU: SKU: 79-300-K2-8KW
2-4. MELTING CHAMBER
Thermocouple (K) #14250400
Thermocouple (R) #14230000
Stopper holder ass'y #14740000
Lid
Stopper rod #25090410
Partition #14880302
Guide for metal charge #14754000
Support ring for partition #14880301
Graphite crucible 8000 #25105000
Ceramic spacer for model 8000 #14880303
Outer crucible #14755018
Melting chamber
O-ring , P200 #28220000

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Yasui K2 NEXT Instruction Manual SKU: SKU: 79-300-K2-8KW
3. PREPARATION BEFORE CASTING
CAUTION
When supplying power and others to this product for the rst time after installation, be sure to fully
understand and confirm the details about installation described in the separate section.
If installed incorrectly, problems on heating, overheating on wiring, control system, gas leakage, and
insufficient vacuum may not only affect the casting results, but also may cause serious damage to the
product and human body.
3-1. CHECKING POINTS BEFORE POWER ON
Check below points prior to power ON.
1) Connection of vacuum pump and its direction of rotation
2) Pressure of supply inert gas and electricity
3) Connection of hose to WATER IN
4) Connection of hose to WATER OUT
CAUTION
Make sure before starting heating that tap water is turned on and cooling water is running inside
machine. It won't be operated by error message when water supply is not enough.
3-2. SETTING CRUCIBLE AND OTHER PARTS
Set up below items.
Meting chamber >> 1) Outer crucible, inner crucible
Mold chamber >> Protection sleeve, pan and ask base
Below mold chamber >> Cover for cylinder rod (#14721000)
IMPORTANT
If cylinder rod head cover is forgotten, the lid lock action
cannot be performed properly.
At the time of installing the product, be sure to check it is set in place.
Cover for cylinder rod
Lid lock cylinder
2) Partition, Guide for metal charge
3) Stopper holder, stopper
4) Thermocouple

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Yasui K2 NEXT Instruction Manual SKU: SKU: 79-300-K2-8KW
4. OPERATION
4-1. OPERATION PANEL AND OTHERS
Major operation will be done around this area.
4-2. POWER ON
Turn knob of BREAKER switch until its white dot is set to
ON position.
Power is supplied to all necessary parts.
initial display will be shown after pushing 'MASTER BUTTON'
as instructed on LCD.
IMPORTANT
Turn knob securely until it clicks into place.
When white dot on the knob moved to TRIPPED position during use of this product, over current has
flown inside (TRIPPED condition by over current). In this case, check the cause and take necessary
action. Then, turn knob to OPEN RESET position. Next, turn knob to ON.
Control panel
Emergency button
Set Press regulator
Breaker
START
BUTTON
MASTER
BUTTON
RESET
BUTTON
300

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Yasui K2 NEXT Instruction Manual SKU: SKU: 79-300-K2-8KW
4-3. OPERATION
AUTOMATIC OPERATION
1) Turn main breaker ON.
2) Push MASTER button.
3) Select memory at main display.
4) Put metal into crucible and close lid.
5) Put mold into chamber and close.
6) Push START button for more than 2 seconds.
7) Take mold out from chamber when casting process completed.
Details on main display;
300
030210
30
tab select button
Recipe / comments display and setting
Recipe number display and setting
Recipe display and
setting
Menu tab select button
AUTO/MANUAL select button
AFTER mode select button
STOPPER button
Water temperature
Present Temerature
Common information
display and setting area
Present chamber pressure / Chage tank pressure setting
Simple display select button

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Yasui K2 NEXT Instruction Manual SKU: SKU: 79-300-K2-8KW
4-4. SET PRESS Regulator
Turn SET PRESS regulator knob to set the nal pressurization value of internal charge tank. Set
value is indicated on operation panel.
Maximum pressure value of this product is 300 kPa.
When you nish turning knob, push knob in to lock.
4-5. EMERGENCY STOP button
In case of emergency, press EMERGENCY STOP button to stop all of the functions.
To recover, turn it clockwise and press RESET button.
4-6. WINDOW AFTER START BUTTON
After pushing START button for actual casting, the window changes to GAUGE window.
Big bourdon tube style manometer enables you to feel pressure instinctively by needles.
While digital display in the gauge is very useful for reviewing casting result.
K2NEXT 8000 shows not only pressure in melting chamber but also mold chamber pressure.
You will know the condition of sealing disk, investment quality, difference by control suction value and
others to improve casting result.
Other tabs except for ALL LIST tab are not shown while casting operation.
300
SV92500
1050
50
30
1050
248
-95
Melting
chamber
Mold
chamber

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Yasui K2 NEXT Instruction Manual SKU: SKU: 79-300-K2-8KW
4-6-1. LEFT SIDE OF WINDOW
4-6-2. RIGHT SIDE OF WINDOW
4-6-3. TOP OF WINDOW
300
30
1050
1050
300
50
There is ‘CAST temperature setting’ box on top of this window.
You can change setting during heating by tapping this box to call
keyboard.
VAC button in the middle.
You can adjust vacuum level by this button.
M-GAS button at bottom
You can adjust pressure level by this button.
Charge tank pressure indicator on top.
You can adjust it by regulator in front of machine.
You can check cooling water temperature at drain exit.
Please be careful you will have warning when it increased over 40
degrees Celsius.
You can switch ‘AUTO’ or ‘MANUAL’ pour by these
buttons.
You can switch automatic mode casting or ‘AFTER’
mode casting.
‘OPEN’ box for EXH counting down window.
At lower level, ‘HEAT POWER’ indicator and present
temperature indicator for your reference.
‘HEAT’ button, you can heat on or off while heating.
‘F-HEAT’ button for 100% heating anytime.
You will find the window as you see on the right at
standing by (details will be described later)
Before casting
After START button

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Yasui K2 NEXT Instruction Manual SKU: SKU: 79-300-K2-8KW
5. FLASK
5-1. FLASK COMBINATION
Sealing disk #14226600
Flask
chamber
Protection sheet #14045500
Flask
Flask base #14743000
Extention for short ask
#14031000
Pan #14880411
O-ring P200 #28220000
Protection sleeve(K2 NEXT)
#14880412
Spacer for 89φ dia. ask #14742200
O-ring G-65 #28306500
Use of a perforated ask is
recommended.
Position the ask and other
accessories in order as the
below figure.