DOOVAC SML-030 User manual

USER’S MANUAL
Rotary Vane Vacuum Pump
(Dry-Running)
Type: SML-030~280
Please read this Manual thoroughly before operating this product.

Introduction
Thank you very much for using the DOOVAC Vacuum Pump. We at DOOVAC specialize in the design
and manufacture of vacuum pumps and air compressors on the basis of our abundant experience and
technical prowess.
This User Manual describes the procedures for the installation, operation and maintenance of the
product, including the specifications, safety cautions, transportation, storage, testing, commissioning,
environmental conditions, maintenance, troubleshooting, and recommended spare parts.
Please perform installatio n and commissioning prior to operating the product, after reading this
Manual carefully. If you have any problems, please contact us.
Keep this User Manual near the product for convenient refe rence.
Technical specifications
Te chnical Data
SML-030
SML-060
SML-
N60
SML-140
SML-280
Nominal displacement 50Hz ℓ/min
60Hz ℓ/min
25
30
50
60
50
60
120
140
235
280
Ultimate pressure
mmHg
bar
550~600
1
550~600
1
550~600
1
660
1
660
1
Motor version(3~) 50Hz
V
60Hz V
-
-
-
-
-
-
-
-
220/380
220/380
Motor version(1~) 50Hz
V
60Hz V
110/220
110/220
110/220
110/220
110/220
110/220
110/220
110/220
110/220
110/220
Nominal motor rating(3~)
W
-
-
-
420
Nominal motor rating(1~)
W
40
90
90
350
550

Nominal motor speed 50Hz RPM
60Hz RPM
1430
1720
2850
3420
1430
1720
1430
1720
1430
1720
Sound level
db(A)
58
58
58
58
68
Inlet Port pt”
1/4
1/4
1/4
1/4
3/8
Exhaust Port
pt”
1/4
1/4
1/4
1/4
3/8
Weight (approx.) kg
7
7
8
13.5
25.5
Parts and Identifications
a. Electric motor
b. Power connector
c. Exhaust port
d. Inlet port
e. Filter handle
f. Vane
g. Rotor
h. Cylinder
i.
Cylinder side plate
a b c d
f g h
i
e

I. Product Description
1. Op erating Conditions
This SML type, oil-less vacuum pump is designed and manufactured in accordance with the
following operating conditions:
◈Air and inert gases
◈Inlet gas temperature: 0℃~ 42℃
◈Ambient temperature: 5℃~ 40℃
◈Operating pressure: below the maximum pressure achievable by the pump
◈Others: The performance of the product may vary according to the operating conditions and use.
Please contact us for the optimal specifications before placing an order with us.
Processing high-density gases may cause critical damage to the product; therefore it is strictly
prohibited to use this product for high-density gases.
The maximum pressure of the product is tested at our factory before shipping.
2. Op erational Principles and Functions of the Major Parts
2-1) Operational Principles
Suction Expansion Compression Exhaustion
This product is a dry, vane-type vacuum pump comprising a rotor, vanes, and cylinder. The rotor
and cylinder are eccentric with each other. 4~6 vanes rotates in contact with the cylinder inner wall
by centrifugal force. The volume of the spac e (cell) between the vanes varies, generating vacuum
pressure by suction, expansion, compression, and exhaustion.
The vacuum at the inlet and positive pressure at the outlet are generated continuously thanks to the
superior lubrication and wear resistance of the carbon vanes.
Dry type rotary vane pumps have a higher operating temperature than that of oil-circulating types.
Therefore, though the carbon vanes have an excellent lubrication effect and wear resistance, they
need to be replaced after long-term operation. (See Vane Replacement of Maintenance section.)
3. Co o ling

Cooling of the vacuum pump is performed as follows;
◈Heat radiation on cylinder surface.
◈Air flow generated with the cooling blower blade of the motor.
4. Valve Opening/Closing
This product is not provided with an on/off valve; which need to be provided and installed by the user.
II. Safety
1. Safe ty Precautions
The following precautions must be observed for s afe installation and operation.
◈Connect power with the main power supply cut-off.
◈Power connection and e lectrical servicing (check, repair, e tc) must be conducted b y a qualified
eng ineer.
◈If the operation or safety of the product seems abnormal, stop the vacuum p ump immediately.
◈Do not to uch the o uter surface o f the vacuum pump d uring operation. Otherwise, yo u may get
burned.
◈Do no t insert yo ur hand into the ro tating body. Do no t run the vacuum pump with the cooling fan
blades re moved.
2. Warning Signs
This manual contains the following symbols to indicate safety related cautions and warnings.
DANGER
This sign indicates danger which may cause fatal or serious injuries if the necessary
p recautions a re not ta ken.
CAUTION
This sign indicates dangers w hich may c ause injuries or damages to p roperty if the
ne cessary p recautions are not taken.
WARNING
This sign ind icates p otential d angers which may cause fatal or serious injuries if
the necessary p recautions a re not ta ken.

III. Transportation and Storage
The s uction inlet and exhaust outlet are p lugged w ith a rubber p lug to p rotect the p roduct from
fo re ign matter during transportation and storage. Do not re move the rubber plugs until installation has
be en completed.
IV.Installation
1. Ins tallation Site
◈Avoid the places where there is a possibility of explosion.
◈Ambient temperature: 5~40℃
◈Ambient pressure: atmospheric pressure
◈Other environmental conditions: compliance with the motor protection class.
2. Po wer Connection
2-1) Precautions when Connecting Power
NOTE
This sign indicates tips for efficient and/or effective use or operation of the
product.
NOTE
Store the product indoors , preferably, with the original packing.
WARNING
If you are not sure of the s afety of the product’
s condition or its operation during
installation, stop the installation work immediately.
CAUTION
Place the product horizontally on a level floor. Install and fix the product firmly in
a place where inspection and maintenance can be conducted conveniently.
CAUTION
For effective cooling of the vacuum pump, the circulation of cooling air is
important. Ensure 25cm or greater distance from the adjacent walls.
DANGER
Make sure to c ut-off the main power supply before connecting the power c able.

2-2) Wiring: 3-phase 2-2-1) Wiring: single phase
Delta connection
Low Voltage (220V) Low Voltage (110V)
Y -connection
High Voltage (380V) High Voltage (220V)
If the direction of rotation is not correct under 3-phase wiring, change the wiring of 2-phase.
3. Inle t and O utlet Connection
Remove the rubber plugs and check the cleanliness of the pipes before connecting the inlet and
WARNING
Since connecting is dangerous work, only a qualified engineer may carry out
power connection work, in compliance the following standards;
IEC 364, CENELEC HD 384, or DIN VDE 0100
-IEC-Report 664, DIN VDE 0100
-
BGA A2 (VBG4) or applicable regulations of the region.
CAUTION
The power cable must have sufficient capacity for the electric motor power.
Make sure to provide an electronic contact, overload protector, and ground cable.
CAUTION
When connecting 3-phase power supply, make sure that the motor rotates in the
direction marked on the casing.
Install a revers e rotation protector to prevent reverse rotation.

outlet pipes.
◈Take care that there is no leak hole at the connection between the incoming pipe and the vacuum
pump inlet.
4. Discharge Pipe Connection
V. Cautions for Commissioning and Operation
1. Pre cautions before O peration
Check the following before starting up the product
◈Check that the power voltage and frequency are in accordance with the ratings on the motor’s
nameplate.
◈Check that the inlet and outlet pipes are properly connected.
◈Check that the motor rotates in the designated direction (for 2-phase supply power).
2. Cautions fo r Operation
CAUTION
Foreign matter will damage the vacuum pump seriously. If the inlet gas or
environment is not clean, install an air filter at the inlet pipe.
NOTE
The incoming pipe size should be one step larger than the inlet diameter.
Otherwise, es pecially if the incoming pipe is long, the performance of the vacuum
pump may be degraded.
NOTE
A silencer provided at the outlet side can greatly reduce noise.
(The silencer is an optional item.)
WARNING
Improper voltage and/or frequency may damage the motor critically.
WARNING
Do not run the vacuum pump with the cooling fan cover open.
Do not ins ert your hands ins ide the cooling fan cover.

VI.Maintenance
1. Inle t Filte r maintenance
Check the inlet filter regularly. Clean or replace a dirty filter.
If the inlet filter is very dirty, replace with a new filter.
2. Vanes
The SML type products have 4 vanes.
For the first 6,000 hours of operation and for every 3,000 hours of
operation thereafter, remove the cylinder cover, remove the vanes and
measure the vanes’heights (X).
(See the figure on the right).
The minimum allowable vane heights (X) per model are presented in the
Table below. If any one of the vanes has been worn to a height less
than the allowable value, replace all 4 vanes with new ones.
SML-030/060
SML-N60
SML-140
SML-280
Minimum Allowable
Height (X)
15mm
19mm
31mm
35mm
3. Cle aning Cooling Fan and Fan Cover
A dirty cooling fan cover may disturb the flow of the cooling air. Check and clean the cooling fan
cover regularly.
VII. Troubleshooting
Problem
Possible Cause
Troubleshooting
Rated vacuum
pressure is not
Leak at inlet line
Check the inlet piping. Correct if
there is leakage.
CAUTION
Do not touch the surface of the vacuum pump during operation. Otherwise, you
may get burned.
CAUTION
If any abnormal noise or vibration is emitted, stop the vacuum pump immediately
CAUTION
Foreign matter will seriously damage the vacuum pump. If the inlet gas or
environment is not clean, install an air filter at the inlet pipe.

achieved, or
motor current
is too high
Vacuum On/Off valve failure
Replace with a new valve.
Inlet filter is clogged
Clean the filer or replace with a new
one.
Inlet or outlet pipe is clogged
Clean the pipe(s).
Inlet/outlet pipeline’s diameter is too
large or too long.
Replace with a pipe of the
appropriate diameter.
Vane has been damaged
Check and replace, as necessary.
Gap between the vane and cylinder wall
is inappropriate
Adjust the gap (contact us).
Failure of an inner part
Contact us.
Vacuum pump
will not run.
Motor has
failed
Wrong supply power voltage
Check supply voltage and frequency
with the nameplate.
Motor winding failure
Rewind
Vacuum pump or circuit breaker failure
Open the pump-side cooling fan
cover. Rotate the fan by hand. If it
rotates freely, the problem is at the
pump. Otherwise, check the circuit
breaker.
Motor failure
Replace the motor
Vacuum pump
clogged
Foreign material in the vacuum pump
Send us the product for repair.
Check the inlet filter. Install an
additional filter if necessary.
Vacuum pump has corroded
Send us the product for repair.
Reverse rotation of vacuum pump
Send us the product for repair.
Check the direction cable wiring.
After the pump stopped, foreign matter
entered it and damaged the vane.
Send us the product for repair.
Vacuum pump
runs, but is
overloaded or
generates
abnormal
noise, or motor
current is
excessive
Wrong cable wiring
Check cable wiring with wiring
diagram.
Reverse rotation of vacuum pump
Change phase connection.
After long-term shutdown
Cap the outlet for warming up.
Foreign matter has entered and damaged
the vane or bearing
Send us the product for repair.
Abnormal noise
Damaged bearing
Send us the product for repair.
Damaged vane
Send us the product for repair.

Vacuum pump
temperature
rises too high
Insufficient cooling air flow
Check the installation site.
Check cooling fan and cover, clean
as necessary.
Ambient temperature is too high.
Maintain specified ambient
temperature condition.
Incoming gas temperature is too high.
Maintain specified inlet air
temperature condition.
Improper supply voltage or frequency.
Provide power in accordance with
the specifications.
Inlet filter clogged.
Clean the filter.
Incoming pipeline’s diameter is too small
or length is too long.
Replace the incoming pipe with a
pipe of s uitable size.