Renfert MT plus User manual

#FEJFOVOHTBOMFJUVOH
*OTUSVDUJPONBOVBM߭.PEFEtFNQMPJ
*TUSV[JPOJEߤVTP߭*OTUSVDDJPOFTQBSBFMTFSWJDJP

⠡ኰ佈⥢ᆺ߭ᜪ◅一⥢⩌߭瞦綣砞煿砖
.BEFJO(FSNBOZ
MTplus
No.1803-x000 /-x500
2011-02 21-9873 D Ideas for dental technology

4FSJFOOVNNFS)FSTUFMMEBUVNVOE(FS¤UF7FSTJPOCFGJOEFOTJDIBVGEFN(FS¤UF5ZQFOTDIJME
4FSJBMOVNCFSBOEEBUFPGNBOVGBDUVSJOHBSFTIPXOPOUIFUZQFQMBUFPGUIFVOJU
-FOVN©SPEFT©SJFFUMBEBUFEFGBCSJDBUJPOTFUSPVWFOUTVSMBQMBRVFTJHOBM©UJRVFEFM࣌BQQBSFJM
*MOVNFSPEJTFSJFFMBEBUBDPTUSV[JPOFTJUSPWBOPTVMMBUBSHIFUUBEFMM࣌BQQBSFDDIJP
&MOºNFSPEFTFSJFZMBGFDIBEFGBCSJDBDJ³OFTU¡OJOEJDBEPTFOMBQMBDBJEFOUJGJDBEPSBEFMBQBSBUP

ⳃ㋝崲㈓㊨医ⳃ䐁䔻曇䘣Ⲫ䕈䕖咠猉偨ⰦႦ
ᄴᅧᄟᅨ历㈓Ⴅ朙渼䐁აᄎჹ曡嶊ჴᅍᅵᄵᅤᅰჵ曡嶊ჴ㖧历㈓ᅦᅖᅨჱ栴津მᄒწ჊ᄄჟႦ
饝逭鰽螙錅麝黱鷽鸑銐蒱蒱錅麅鷁蒱蒱鷙鄆ꦑ鱑ꫝ饝誙鰵鸉餶襉襥

1 2
3b3a
4b4a
65
987

12 13
1110
16
1514
1817
100V
120V
NO !

21 22 23
2019
25a
24
28 29
2726
25b

12 h
32 33
3130
35
383736
34
414039

- 1 - EN
MTplus Plaster Trimmer
No.1803-x000 /-x500
3. Safety Information
Please observe all applicable accident
prevention regulations together with
the following safety notes when trim-
ming:
MTplus is an electrical appliance
with a danger potential. This
appliance may be connected
/ used only by authorized and
qualified persons after checking
its conformity with respect to the
national norms.
Never reach into the grinding
wheel while the unit is con-
nected to the power supply.
Inadvertently starting the unit
can result in injury!
Always keep long hair, loose or
wide sleeves or other clothing
away from the trimmer. Hair or
clothing can be pulled into and
wrapped up on the grinding
wheel, resulting in injury!
The unit is designed solely for
grinding plaster models. Cancer
causing dusts are released when
trimming investment material.
Never open the front cover while
the motor is running. The motor
safety shutoff will not stop the
grinding wheel immediately.
Only open the front cover after
the grinding wheel has come to
a complete stop.
Always wear protective eyewear
when grinding.
Do not reach into the grinding
wheel while it is turning.
ENGLISH
1. Introduction
We are pleased with your decision to
purchase an MTplus. The trimmer sets
new standards with regard to function,
performance, safety, and design.
Please note the following information.
2. Application Area
The MTplus is a model trimmer designed
for use in dental technology operations to
grind plaster models. It can be employed
as either a wet or dry trimmer.
2.1 Ambient Conditions
(in accordance with
DIN EN 61010-1)
The MTplus may only be operated:
• Indoors;
• Up to an altitude of 2,000 m [6,500 ft]
above sea level;
• At an ambient temperature of 5 - 40°C
[41 - 104°F] *);
• At a maximum relative humidity of 80%
at 31°C [87.8°F], decreasing linearly to
50% relative humidity at 40°C [104°F] *);
• With a mains power supply where cur-
rent fluctua-tions do not exceed 10% of
the nominal value;
• Under level 2 contamination conditions;
• Under overvoltage category II condi-
tions.
*) Between 5 – 30°C [41 - 86°F], the unit can be operated at a
relative humidity of up to 80%. At temperatures between
31 - 40°C [87.8 - 104°F], the humidity must decrease
proportionally in order to ensure operational readiness
(e.g., at 35°C [95°F] = 65% humidity; at 40°C [104°F] = 50%
humidity). The unit may not be operated at temperatures
above 40°C [104°F].

- 2 -EN
Do not work without the mo-
del table installed and locked
(„click“). Small parts or fingers
can be drawn into the trimmer,
resulting in serious injury.
Remove the trimmer table only
after the grinding wheel has
come to a complete stop and the
front cover is opened.
Operate the equipment only
under supervision
Additional notes for dry trimming:
The extraction must be selected
to match the dust being gene-
rated (if necessary, consult the
responsible professional organi-
zation).
Operating the unit can result in a
very high noise level >>> always
wear ear protection.
3.1 Liability Exclusion
Renfert GmbH shall be absolved from
all claims for damages or warranty if:
The product is employed for any pur-
•
poses other than those cited in the
operating instructions;
The product is altered in any way
•
other than those alterations descri-
bed in the operating instructions;
The product is repaired by other than
•
an authorized facility or if any but
Renfert OEM parts are employed;
The product continues to be emplo-
•
yed, despite obvious safety faults.
4. Commissioning /
Operation
First, check to make sure that your
mains power corresponds with the po-
wer requirements given on the trimmer
nameplate.
The type of usage wet- (see pt. 4.1 and
4.2) or dry-trimming (see pt. 4.1 and
4.3) must be determined prior to use.
4.1 Mounting the Trimmer Disc
Please refer to the trimmer disc instruc-
tions (resp. to pt. 5.1 in this instructions)
for the mounting procedure.
Range of application of the discs:
• Klettfix for wet trimming
• Marathon for wet or dry trimming
• Infinity for wet trimming
4.2 Wet Trimming
1. Set the unit up near the water source /
drain, with a plaster trap (Fig. 1).
2. Connect the drain hose to the trimmer
(Fig. 2). Turn the drain hose on the
connecting branch counter clo-
ckwise and fix with a hose clamp
(Fig. 2b)!
3. Position the trimmer hose in the drain
(Fig. 3a/3b).
4. Connect the water hose to the trimmer
(Fig. 4a/4b). Observe the necessary
water pressure (see pt. 8 / technical
specifications)!
5. Connect the water hose to a water
supply with a shutoff tap (Fig. 5).
6. Open the water supply (Fig. 6a) and
check for leaks (Fig. 6b).
7. Plug the power cord into the wall outlet
(Fig. 7).
8. Switch the unit on (Fig. 8).
9. Adjust the water flowrate (Fig. 9).
Attention: the water inlet is closed on
delivery.
The MTplus is now ready for use as a wet
trimmer.

- 3 - EN
General information concerning wet
trimming:
• An adequate water flow is impor-
tant, particularly when trimming
with diamond-coated discs. Over-
heating will damage the disc.
• The water supply shutoff tap
should be turned off during longer
work interruptions or overnight.
4.3 Dry Trimming
1a. Connect the trimmer to an external
extractor (Fig. 10 illustrates an exa-
mple using a Renfert extraction hose
and coupling).
Attention!
100V / 120V units in combinati-
on with dust extractors should
be separately connected to the
mains in order to avoid an over-
charging of the extractor and of
the electric network (do not use
the automatic start-up!). If the
electric network is protected by
fuse of only 15 A, it is necessary
to connect the trimmer and the
extractor to separately protected
electric circuits.
Recommended dust extractors:
see: Accessories, Extraction units etc.
1b. Connect the trimmer to the central ex-
traction (Fig. 10 illustrates an example
using a Renfert extraction hose and
coupling).
Recommended accessories:
see: Accessories, Extraction units etc.
2. Open the front cover (Fig. 11).
3. Remove the rinse tube (Fig. 12).
4. Close the opening with the blind plug
(completely impress it) from the
hardware set (Fig. 13).
5. Close the front cover (Fig. 11).
6a. For extraction with automatic start-up:
• Connect the trimmer power cord to
the extractor (Fig. 14).
• Set the extractor up for automatic
operation.
6b. For extraction without automatic start-
up:
• Plug the trimmer power cord into the
wall outlet (Fig. 7).
• Switch on the MTplus (Fig. 8), switch
the extractor on automatic use.
The MTplus is now ready for use as a dry
trimmer.
4.4 Conversion from Wet to Dry
Operation
1. Disconnect the unit from the power
supply (Fig. 7).
2. Shut off the water supply (Fig. 6a).
3. Remove the water hose (Fig. 4a/4b).
4. Remove the drain hose (Fig. 2).
5. If necessary, remove the unit from the
wet area an allow to dry completely.
All remaining moisture must be
blown off with compressed air!
6. Remove the trimmer disc
(see pt. 5.1, steps 4 to 7).
7. Clean the area behind the flange first
with a wet and then with a dry cloth
(Fig. 25a). Moreover blow off with
compressed air (Fig. 25b).
8. Once the unit is dry, proceed as descri-
bed in Section 4.3.
Partially diamond-coated trimmer discs
should be used for dry operation.
Recommended trimming disc:
see: Accessories, Trimming discs - for wet
and dry trimming
4.5 Conversion from Dry to Wet
Operation
1. Disconnect the unit from the power
supply (Fig. 7 or 14).
2. Remove the extractor hose (Fig. 10).
3. Remove the trimmer disc (see pt. 5.1,
steps 4-7).
4. Using a brush, thoroughly clean
the front cover and the inside of the
housing with an extractor and a brush
(Fig. 26).

- 4 -EN
5. Remove the blind plug. Should it be
difficult, you can use the Allen key
(Fig. 16).
6. Mount the trimmer disc (see instruc-
tions for trimmer discs).
7. Install the rinse tube (Fig. 12).
8.
Then, proceed as described in Section 4.2.
4.6 Recommendation for dry or
wet trimming
• Dry trimming is not allowed when the
MTplus is equipped for wet trimming.
• Wet trimming is not allowed when the
MTplus is equipped for dry trimming.
• Not observing the prior instructions will
result in plaster residue mixing with
water and hardening to a difficult to
remove crust. Such residues particularly
on the back of the trimmer disc can lead
to imbalance.
4.7 Grinding Angle Adjustment
(89°-99°)
1. Loosen the knurled nut (Fig. 17).
2a. Adjust the grinding angle roughly with
the adjusting screw (Fig. 18).
If the adjusting screw is turned to the
top, the angle between model table
and trimmer disc is of 89°. If the adju-
sting screw is completely turned out,
the angle between model table and
trimmer disc is of 99°.
2b. Adjustment of the model table roughly
with the adjusting screw (Fig. 18). The
lower border of the model table should
coincide with the upper border of the
model-table support (Fig. 19 + 20).
2c. Fine adjustment of the model table at
90° with the adjusting screw (Fig. 18)
and set square out of the hardware set
(Fig. 21).
3. Retighten the knurled nut (Fig. 17).
4.8 Operation / Trimming
Using both hands, securely set the model
on the trimmer table and press it against
the disc (Fig. 22).
5. Cleaning / Maintenance
A raising of plaster dust in
aerodynamic dead areas when
dry trimming is normal and has
no negative influence on the
function or grinding power of the
MTplus.
1. Disconnect the unit from the power
supply (Fig. 7 or 14).
2. If necessary, shut off the water supply
(Fig. 6).
3. Open and unhook the front cover
(Fig. 11 + 23).
4a. For wet trimmer: If necessary, remo-
ve the table (Fig. 30 + 40) and clean
with a brush under running water
(Fig. 24).
Do not remove the grinding
table if the front cover is closed
otherwise the trimmer disc will
be damaged!
4b. For dry trimmer: Clean using a
vacuum and brush (Fig. 26). Clean the
drain tube and tube connection
(Fig. 27).
5. Reinstall and close the front cover
(Fig. 23 + 11).
5.1 Trimmer Disc Replacement
1. Switch the unit off (Fig. 8).
2. Disconnect the unit from the power
supply (Fig. 7 or 14).
3. If necessary, shut off the water supply
(Fig. 6a).
4. Open the front cover (Fig. 11).
5. If necessary, remove the rinse tube
(Fig. 12).
6. Remove the SW4 Allen key from its
holder (Fig. 28).
7. Remove the thread cover, loosen the
centring screw, and remove the disc
(Fig. 31 + 29).

- 5 - EN
8. If necessary, clean the flange
(refer to Section 5.2).
9. Place a new disc on the lock pin
(Fig. 30).
10. Retighten the centring screw with the
Allen key (Fig. 29).
11. Place the thread cover back on the
centring screw (Fig. 31).
12. Return the Allen key to its holder
(Fig. 28).
13. If necessary, replace the rinse tube
(Fig. 12).
14. Close the front cover (Fig. 11).
15. If necessary, open the water supply
(Fig. 6a).
16. Plug the power cord into the wall outlet
(Fig. 7 or 14).
5.2 Flange Replacement /
Cleaning
1. Remove the disc (refer to Section 6.1,
steps 1-7).
2. Have the pulling screw and Allen key
at hand
>>> see tool kit enclosed (Fig. 32).
3. Screw the pulling screw into the flange
(Fig. 33) >>> The flange may not be
removed by hand. Always use the
pulling screw to remove the flange!
4. Remove the flange (Fig. 34).
5. Remove the pulling screw from the
flange.
6. Clean the flange and the inside of the
housing
>>> Do not damage the seals!
Recommended for cleaning:
see: Accessories
7. Lightly coat the motor shaft and seal
with Vaseline.
8. Replace the flange
>>> Note the engagement groove
(Fig. 35).
9. Replace the flange by hand on the
shaft (Fig. 36).
10. Reinstall the grinding disc (refer to
Section 5.1, steps 9-16).
5.3 Spray Tube Replacement /
Cleaning (Wet Trimmer)
1. Remove the rinse tube (refer to Sec-
tion 5.1, steps 1-5).
2. Remove the gaskets (Fig. 37).
3. Allow the rinse tube to soak in decalci-
fying agent overnight (Fig. 38).
4. Reinstall the gaskets and coat them
lightly with Vaseline (Fig. 37).
5. Replace the rinse tube (Fig. 12).
6. Close the front cover (Fig. 11).
7. If necessary, open the water supply
(Fig. 6a).
8. Plug the power cord into the wall outlet
(Fig. 7 or 14).
5.4 Grinding Table Replacement /
Cleaning
1. Switch the unit off (Fig. 8).
2. Disconnect the unit from the power
supply (Fig. 7 or 14).
3. Open the front cover (Fig. 11).
Do not remove the grinding
table if the front cover is closed
otherwise the trimmer disc will
be damaged!
4. Unlatch and remove the grinding table
(Fig. 39 + 40).
5. Remove the front cover (Fig. 23).
6. Clean the grinding table and front
cover wit a brush under running water
(Fig. 24).
7. Replace and close the front cover
(Fig. 23 + 11).
8. Reinstall the grinding table (Fig. 40).
Make sure the retainers are com-
pletely free of all plaster residue!
Make sure the work table is pro-
perly seated on the front cover!
9. Plug the power cord into the wall outlet
(Fig. 7 or 14).

- 6 -EN
5.5 Switch Cover Replacement
1. Loosen the fastening screws (Fig. 41).
2. Remove the switch cover and replace
it with a new one
(Art. No. 90003-5788).
3. Retighten the fastening screws.
The MTplus may not be operated
with a defective switch cover!
6. Spare Parts
For the order numbers of consumables
and spare parts please refer to the spare
parts list at the end of this manual.
7. Warranty
Provided the unit is properly used, Renfert
warrants all parts of the MTplus for a
period of 3 years. In case of any claims
for warranty original dealers‘ invoice is
required. Components subject to natural
wear (e.g., trimmer discs) are excluded
from this warranty.
The warranty is voided in case of impro-
per use, failure to observe the operating,
cleaning, maintenance, and connection in-
structions, in case of independent repairs
or repairs by unauthorized personnel, if
spare parts from other manufacturers are
employed, or in case of unusual influences
or influences not in compliance with the
utilization instructions. Warranty service
shall not extend the original warranty.
8. Technical Specifications
Mains voltage: 220 V / 50 Hz
120 V / 60 Hz
100 V / 50-60 Hz
230-240 V, 50 Hz
Power consumption:
1,300 W / 1,7433 hp (230 V / 230-240V)
1,500 W / 2,0115 hp (120 V)
1,200 W / 1,6092 hp (100 V)
Water consumption, max.: 9 l/min.
Necessary water pressure:
min. 1 bar
at ca. 6 l/min
max. 5 bar
Speed:
2,830 rpm (230 V / 230-240 V, 50 Hz)
3,420 rpm (120 V, 60 Hz)
2,870 / 3450 rpm (100 V, 50/60 Hz)
Connection piece diameters for
external extraction: 36 mm
Dimensions (WxHxD):298 x 318 x 412 mm
Trimmer disc dimensions: Ø 234 mm
Weight: 13.5 kg
Sound pressure level accord. to
DIN 45635-01-KL3, measured under full
load: Lp(A) = 74 dB(A)
K = 4 dB
9. Standard Delivery
1 MTplus
1 Inlet tube
1 Drain tube
1 Tool set
1 Hardware set
1 Marathon trimmer disc, only on
Nr. 1803-x500

- 7 - EN
10. Delivery Versions
No. 1803-0000 MTplus, 230 V / 50 Hz
No. 1803-0500 MTplus, 230 V / 50Hz,
incl. Marathon trimmer
disc
No. 1803-4000 MTplus, 120 V / 60 Hz
No. 1803-4500 MTplus, 120 V / 60Hz,
incl. Marathon trimmer
disc
No. 1803-5000
MTplus, 100 V / 50-60 Hz
No. 1803-5500 MTplus, 100 V /
50-60Hz, incl. Marathon
trimmer disc
Nr. 1803-6000 MTplus 230-240 V /
50 Hz, AU/NZ
Nr. 1803-6500 MTplus 230-240 V / 50
Hz, AU/NZ
incl. Marathon trimmer
disc
11. Disposal instructions for
countries in the EU
To conserve and protect the environment,
prevent environmental pollution and
improve the recycling of raw materials, the
European Commission adopted a directive
that requires the manufacturer to accept
the return of electrical and electronic units
for proper disposal or recycling.
Within the European Union units with this
symbol should not therefore be disposed
of in unsorted domestic waste:
For more information regarding proper
disposal please apply at your local
authorities.
12. Accessories
No.2011-0000 GO-2011, plaster solvent
Trimming discs - for wet trimming only:
No. 1803-1000 Basic kit:
5 Klettfix silicon carbide
trimmer discs (3 x corn
80, 2 x corn 120)
+ support disc
No. 1803-1100 Refill kit:
5 Klettfix silicon carbide
trimmer discs, corn 80
No. 1803-1200 Refill kit:
5 Klettfix silicon carbide
trimmer discs, corn 120
No. 1803-3000 1 Infinity trimmer disc,
diamond-coated
Trimming discs - for wet and dry-
trimming:
No. 1803-2000 1 Marathon trimmer
disc, partially diamond-
coated
Extraction units etc.:
Silent TS:
Nr. 2921-0050
Silent TS, 230 V, 50/60 Hz
Nr. 2921-1050 Silent TS, 100-120 V,
50/60 Hz
No. 2921-0002 Dust bag set (5 bags)
No. 2921-0003 Muffler set, 2 mufflers
No. 15-0823 Suction hose (by the
metre)
No.
900034305 Hose fitting adapter
No.
933334240 Suction hose
No. 900034314 Y-junction
Vortex
No. 2924-5000
Vortex compact 3L, 230 V
No. 2924-6000 Vortex compact 3L, 120 V
No. 2924-5003 5 filter bags
No. 2924-5005 1 cloth filter
No. 92923-0001 3 m suction hose with
elastic coupling
No. 92923-0010 1 elastic coupling only,
Ø 36 mm
No. 2-0973 1 90° plastic elbow for
drain tube

- 8 -EN
13. Troubleshooting Guide
Fault Possible cause Corrective action
Device fails to
start.
• Power supply not
established.
• Mains fuse faulty.
• Front cover not pro-
perly closed.
• Motor overheated.
• Check the mains power supply.
• Check the mains fuse.
• Close the front cover (Fig. 11).
• Allow the motor to cool down,
then restart at the main power
switch.
Trimmer disc
wobbles.
• Disc is not lying flush
on the flange.
• Disc not tightened
sufficiently.
• Reinstall the disc according to
the directions. Pay attention that
the disc is mounted exactly on
the lock pin (Fig. 30).
• Remove all deposits from the
back of the disc and from the
stopping face of the flange.
• Hand-tighten the disc (Fig. 29).
Excessive noise
while the trimmer
disc is running.
• Disc not adequately
tightened.
• Hand-tighten the disc (Fig.
29), or reinstall, as required
(Sec. 5.1).
Trimmer table
wobbling.
• Trimmer table incor-
rectly installed.
• Reinstall the table according to
the directions (Fig. 40).

- 9 - EN
Wet Trimming:
Fault Possible cause Corrective action
Disc buildup. • Water volume incor-
rectly adjusted at the
device.
• Water supply not fully
open.
• Spray tube plugged.
• Inlet strainer plugged.
• Inlet water pressure
too low.
• Increase the water volume at the
trimmer (Fig. 9).
• Open the water supply (Fig. 6).
• Clean/decalcify the spray tube
(Sec. 5.3).
• Remove the strainer with pliers
and clean / decalcify it.
• The diameter of the inlet pipe is
too small risp. too many users
are connected to a small pipe
>>> Check if water pressure is at
least 1 bar (ask your plumber).
If necessary the water pressure
can artificially increased by a do-
mestic water work (electric pump
and pressure tank).
• Ask your plumber.
Water sprays out
of the grinding
opening.
• Too much water.
• Water drainage impe-
ded.
• Reduce the water volume at the
trimmer (Fig. 9).
• Check/properly lay out drain tube
>>> slope (Fig. 3a + 3b).
No rinse water. • Water connection not
properly established.
• Spray tube soiled /
calcified.
• Check the water connection
(Sec. 4.2 steps 4-6).
• Clean/decalcify the spray tube
(Sec. 5.3).
Water is dripping
out between the
front door and
the housing.
• Gipsum powder order
plaster grains on the
sealing surface.
• Clean the sealing surface and
the sealing ring.

- 10 -EN
Dry Trimming:
Fault Possible cause Corrective action
Disc buildup. • Models are too wet. • Clean the disc with a brush
under running water or with
plaster solvent (Renfert
GO-2011 Art. No. 2011-0000).
Excessive dust
being blown out
of the grinding
opening.
• Extraction not switched on.
• Insufficient suction.
• Extractor or dust bag full.
• Extractor hose blocked.
• Switch the extraction on.
• Increase the suction.
• Replace the dust bag.
• Check/clean the hose.
Subject to modification.