BUSCH DOLPHIN LR User manual

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DOLPHIN LR
Liquid Ring Vacuum Pumps
LR 0110 A, LR 0140 A, LR 0210 A, LR 0300 A
LR 0420 A, LR 0580 A
Instruction Manual
0870237638 | -0001_en-US | Original instructions 9/21/2022

Table of Contents
2 | 40 Instruction Manual DOLPHIN LR 0110-0580 A_EN_en
Table of Contents
1 Safety..................................................................................................................................................................... 3
2 Product Description............................................................................................................................................. 4
2.1 Description of Figures 1 - 4 ................................................................................................................................ 6
2.2 Operating Principle ............................................................................................................................................. 7
2.3 Intended Use ....................................................................................................................................................... 8
2.4 Start Controls....................................................................................................................................................... 8
3 Transport .............................................................................................................................................................. 9
4 Storage .................................................................................................................................................................. 10
4.1 Short Term (Up to 3 Months) ............................................................................................................................. 10
4.2 Medium Term (3 Months to 6 Months)............................................................................................................. 10
4.3 Long Term (Over 6 Months)............................................................................................................................... 10
5 Installation ........................................................................................................................................................... 11
5.1 Installation Conditions........................................................................................................................................ 11
5.2 Connecting Lines / Pipes .................................................................................................................................... 11
5.2.1 Suction Connection............................................................................................................................... 12
5.2.2 Discharge Connection .......................................................................................................................... 12
5.2.3 Operating Liquid Connection .............................................................................................................. 13
5.3 Operating Liquid Settings .................................................................................................................................. 14
5.4 Fitting the Coupling ............................................................................................................................................ 17
6 Electrical Connection........................................................................................................................................... 18
6.1 Machine delivered without Control Box or Variable Speed Drive (VSD)....................................................... 18
6.2 Machine delivered with a Variable Speed Drive (Option)............................................................................... 19
6.3 Wiring Diagram Three-Phase Motor................................................................................................................. 19
7 Commissioning..................................................................................................................................................... 21
7.1 Preventing Cavitation ......................................................................................................................................... 22
8 Maintenance......................................................................................................................................................... 23
8.1 Maintenance Schedule ....................................................................................................................................... 24
9 Overhaul................................................................................................................................................................ 25
10 Decommissioning................................................................................................................................................. 26
10.1 Dismantling and Disposal .................................................................................................................................. 26
11 Spare Parts............................................................................................................................................................ 27
12 Troubleshooting................................................................................................................................................... 28
13 Technical Data...................................................................................................................................................... 32
14 EU Declaration of Conformity............................................................................................................................. 35
15 UK Declaration of Conformity ............................................................................................................................ 36

Safety | 1
Instruction Manual DOLPHIN LR 0110-0580 A_EN_en 3 | 40
1 Safety
Prior to handling the machine, this instruction manual should be read and understood. If anything
needs to be clarified, please contact your Busch representative.
Read this manual carefully before use and keep for future reference.
This instruction manual remains valid as long as the customer does not change anything on the
product.
The machine is intended for industrial use. It must be handled only by technically trained personnel.
Always wear appropriate personal protective equipment in accordance with the local regulations.
The machine has been designed and manufactured according to state-of-the-art methods. Never-
theless, residual risks may remain, as described in the following chapters and in accordance with the
chapter Intended Use [➔8]. This instruction manual highlights potential hazards where appropri-
ate. Safety notes and warning messages are tagged with one of the keywords DANGER, WARNING,
CAUTION, NOTICE and NOTE as follows:
DANGER
... indicates an imminent dangerous situation that will result in death or serious injuries if not
prevented.
WARNING
... indicates a potentially dangerous situation that could result in death or serious injuries.
CAUTION
... indicates a potentially dangerous situation that could result in minor injuries.
NOTICE
... indicates a potentially dangerous situation that could result in damage to property.
NOTE
... indicates helpful tips and recommendations, as well as information for efficient and trou-
ble-free operation.

2 | Product Description
4 | 40 Instruction Manual DOLPHIN LR 0110-0580 A_EN_en
2 Product Description
DOLPHIN LR 0110 A - LR 0300 A
OUT
IN
OPO
SSI
SSI
OPI
IDS
DOLPHIN LR 0420 A, LR 0580 A
OUT
IN
AOUT
OPO
AOUT
AIN
SSI
OPI
AIN
IDS

Product Description | 2
Instruction Manual DOLPHIN LR 0110-0580 A_EN_en 5 | 40
Description
AIN Alternative side suction connections* AOUT Alternative side discharge connections**
IDS Integral discharge separator IN Suction connection
OPI Operating liquid inlet OPO Operating liquid outlet
OUT Discharge connection SSI Shaft seal flushing inlet***
* No manifold, both connections to be used.
** For installations where gas and liquid are discharged to open gutter, both connections open.
*** Supplied only when no internal flushing.
12
34
OUT
OUT
OUT/
OPO
OUT
OPO
DC DC
DC
DC
IN
IN
IN
IN
MKU
OVF
MKU
OVF
IDS GV
PG
SSC
SSI
CG
OPC
OPI
ADV
OPDGPD
ICV
SV LLI HX
Description
ADV Automatic drain valve CG Compound pressure gauge
DC Drain connection GPD Gland packing drain
GV Vacuum gauge HX Heat exchanger
ICV Inlet check valve IDS Integral discharge separator
IN Inlet LLI Liquid level indicator
MKU Makeup OPC Operating liquid control
OPD Operating liquid drain OPI Operating liquid inlet

2 | Product Description
6 | 40 Instruction Manual DOLPHIN LR 0110-0580 A_EN_en
Description
OPO Operating liquid outlet OVF Overflow
OUT Gas discharge PG Pressure gauge
SSC Shaft seal flushing control SSI Shaft seal flushing inlet
SV Separator vessel
NOTE
Technical term.
In this instruction manual, we consider that the term ‘machine’ refers to the ‘vacuum pump’.
NOTE
Illustrations
In this instruction manual the illustrations may differ from the machine appearance.
2.1 Description of Figures 1 - 4
●Figure 1 shows the general standard once through arrangement with integral discharge separa-
tor manifold.
●The arrangements of figure 2 (partial recirculation) and 3 (total recirculation) are for handling
combustible, corrosive and explosive gases as well as the gas which is required to be recycled. If
the working liquid is recirculated in the system as shown in figure 3, then a heat exchanger
should be used for cooling the liquid.
●Figure 4 (option for LR 0420 A and LR 0580 A only) shows the arrangement where gas and water
leave from the side flange of the vacuum pump and discharge directly into the gutter.
NOTICE
If applying the configuration shown in figure 4.
The discharge pressure will rise and lead to an increase in shaft power.
●Make sure the cross-sectional area of the gutter is large enough.
NOTICE
If recirculation of the service liquid is not required.
Drainage of the liquid should comply with the appropriate environmental regulations.
WARNING
If handling gas that is flammable or toxic.
Risk of severe injury!
●The drained liquid should be separated twice and transferred to a safe place when applying the
figure 1 arrangement. Particular care should be taken to avoid any leakage of dangerous gases
from the water drain outlet.

Product Description | 2
Instruction Manual DOLPHIN LR 0110-0580 A_EN_en 7 | 40
WARNING
If applying the configuration shown in figures 2 and 3.
The gas leakage should be controlled according to the local conditions.
2.2 Operating Principle
1
2
3
4
Description
1 Alternative side outlet flange 2 Alternative side inlet flange
3 Standard top outlet flange 4 Standard top inlet flange
The machine works on the liquid ring principle.
An eccentrically mounted impeller rotates in a housing partially filled with operating liquid (usually
water). The impeller blades dip into the fluid, and the centrifugal force exerted by their rotation
forms a so-called liquid ring within the housing. The pumped medium is transported in the spaces
between the blades and the liquid ring. The eccentric rotation of the impeller alters the volume of
these spaces, causing gas to be drawn in, compressed and expelled.

2 | Product Description
8 | 40 Instruction Manual DOLPHIN LR 0110-0580 A_EN_en
2.3 Intended Use
WARNING
In case of foreseeable misuse outside the intended use of the machine.
Risk of injuries!
Risk of damages to the machine!
Risk of damages to the environment!
●Make sure to follow all instructions described in this manual.
The machine is intended for the suction of air, vapor and other gases.
For explosive gases and vapors (if a "Ex(inside)" sign is written on the nameplate), please refer to the
ATEX supplement for additional safety information on operation in hazardous zones.
Conveying of other media leads to an increased thermal and/or mechanical load on the machine
and is permissible only after a consultation with Busch.
The machine is intended for the placement in a non-potentially explosive environment.
The machine is capable of maintaining ultimate pressure, see Technical Data [➔32].
The machine is suitable for continuous operation.
Permitted environmental conditions, see Technical Data [➔32].
2.4 Start Controls
The machine comes without start controls. The control of the machine is to be provided in the
course of installation.

Transport | 3
Instruction Manual DOLPHIN LR 0110-0580 A_EN_en 9 | 40
3 Transport
WARNING
Suspended load.
Risk of severe injury!
●Do not walk, stand or work under suspended loads.
●The crane and slings must be capable of lifting the weight of the pump.
●To find out the weight of the machine, refer to the chapter Technical Data [➔32] or the name-
plate (NP).
●Use appropriate slings.
●Generally, the lifting point should be on the baseplate on which the machine is installed.
●The lifting point of a bare shaft pump is shown above.
●Check the machine for transport damage.

4 | Storage
10 | 40 Instruction Manual DOLPHIN LR 0110-0580 A_EN_en
4 Storage
NOTICE
Storage temperature below +5°C.
Risk of damage to the machine!
●Drain the operating liquid from the machine and the system before storage.
●Or add an anti-freeze solution.
After testing, all Busch DOLPHIN vacuum pumps are vented and drained.
4.1 Short Term (Up to 3 Months)
●Seal all apertures with adhesive tape or provided caps.
If possible:
●Store the machine indoors, dry, dust free and if possible in original packaging preferably at tem-
peratures between +5 … 55 °C.
4.2 Medium Term (3 Months to 6 Months)
●Remove the shaft coupling guard (if not supplied as a bare shaft machine).
●Rotate the machine shaft by hand weekly to prevent bearing indentation.
●Leave the shaft at approximately 90 degrees to the original position, using a temporary mark on
the shaft to assist.
●Replace the coupling guard, taking care to align correctly and ensure that all fasteners are re-
placed and fully tightened.
●Where shaft seal is gland packing, loosen the packing gland plate.
4.3 Long Term (Over 6 Months)
If the machine is constructed in cast iron material:
●Preserve internals by using a combined VPI (Vapor Phase Inhibitor) and Contact Inhibitor Oil at a
recommended concentration of 1 liter per m3 to prevent the machine from corroding. Ensure all
apertures are sealed after application.
●Remove the shaft coupling guard (if not supplied as a bare shaft machine).
●Rotate the machine shaft by hand weekly to prevent bearing indentation.
●Leave the shaft at approximately 90 degrees to the original position, using a temporary mark on
the shaft to assist.
●Coat the exposed shaft ends and shaft coupling with wax preservative or heavy grease.
●Replace the coupling guard, taking care to align correctly and ensure that all fasteners are re-
placed and fully tightened.

Installation | 5
Instruction Manual DOLPHIN LR 0110-0580 A_EN_en 11 | 40
5 Installation
5.1 Installation Conditions
NOTICE
Use of the machine outside of the permitted installation conditions.
Risk of premature failure!
Loss of efficiency!
●Take care that the installation conditions are fully complied with.
●Make sure that the environment of the machine is not potentially explosive.
●Make sure that the ambient conditions comply with the Technical Data [➔32].
●Make sure that the environmental conditions comply with the protection class of the motor.
●Make sure that the installation space or location is protected from weather and lightning.
●Make sure that the installation space or location is vented such that sufficient cooling of the ma-
chine is provided.
●Make sure that cooling air inlets and outlets of the motor fan are not covered or obstructed and
that the cooling air flow is not affected adversely in any other way.
●Make sure that enough space remains for maintenance work.
●Make sure that the machine is placed or mounted horizontally on a flat surface.
●Make sure that the machine is connected to an operating liquid system, see Operating Liquid
Connection.
●Make sure that all provided covers, guards, hoods, etc. are mounted.
In case of a machine delivery without motor:
●Make sure that the coupling is correctly aligned, see Fitting the Coupling [➔17].
If the machine is installed at an altitude greater than 1000 meters above sea level:
●Contact your Busch representative, the motor should be derated or the ambient temperature
limited.
5.2 Connecting Lines / Pipes
●Remove all protective covers before installation.
●Make sure that the connection lines cause no stress on the machine‘s connection; if necessary use
flexible joints.
●Make sure that the line size of the connection lines over the entire length is at least as large as
the connections of the machine.
In case of long connection lines it is advisable to use larger line sizes in order to avoid a loss of effi-
ciency. Seek advice from your Busch representative.

5 | Installation
12 | 40 Instruction Manual DOLPHIN LR 0110-0580 A_EN_en
5.2.1 Suction Connection
NOTICE
Ingress of foreign objects.
Risk of damage to the machine!
If the inlet gas contains foreign solid particles:
●Install a suitable inlet screen (smaller than 0.2 mm mesh size) upstream of the machine.
Connection size(s):
– DN125 PN10 (for LR 0110 A and LR 0140 A)
– DN150 PN10 (for LR 0210 A and LR 0300 A)
– DN200 PN10 (for LR 0420 A)
– DN250 PN10 (for LR 0580 A)
5.2.2 Discharge Connection
NOTICE
Discharge gas flow obstructed.
Risk of damage to the machine!
●Make sure that the discharged gas will flow without obstruction. Do not shut off or throttle the
discharge line or use it as a pressurized air source.
NOTICE
Too high elevation or lack of separation.
Will cause back pressure and possible drive motor overload!
●The discharge piping on machines without integral separator manifold should not exceed an ele-
vation of more than 1000 mm above the discharge flange (OUT) of the machine until the liquid is
separated.
Connection size(s):
– DN125 PN10 (for LR 0110 A and LR 0140 A)
– DN150 PN10 (for LR 0210 A and LR 0300 A)
– DN200 PN10 (for LR 0420 A)
– DN250 PN10 (for LR 0580 A)

Installation | 5
Instruction Manual DOLPHIN LR 0110-0580 A_EN_en 13 | 40
5.2.3 Operating Liquid Connection
DOLPHIN LR 0110 A - LR 0300 A
F (OPI) H C (OPO) G (SSI) I
DOLPHIN LR 0420 A, LR 0580 A
I
G (SSI) F (OPI)
H
K J (ADV)K

5 | Installation
14 | 40 Instruction Manual DOLPHIN LR 0110-0580 A_EN_en
Description
C Operating liquid outlet (OPO) F Operating liquid inlet (OPI)
G Shaft seal flush connection (SSI) H Clean and drain plug
I Stuffing box drain plug J Automatic drain valve (ADV)
K Casing drain plugs
Connection sizes:
Machine type C F G H I
LR 0110 A G3" G1" G1/4" G¾" G¾"
LR 0140 A G3" G1" G1/4" G¾" G¾"
LR 0210 A G3" G11/4" G½" G1" G¾"
LR 0300 A G3" G11/4" G½" G1" G¾"
Machine type C F G H I J K
LR 0420 A DN100 DN25 G½" DN25 G½" G1" G½"
LR 0580 A DN125 DN50 DN20 G11/4" G½" G1" G½"
●Make sure that the operating liquid complies with the requirements, see Operating Liquid Set-
tings.
5.3 Operating Liquid Settings
The machine cannot operate without an operating liquid system. The actual scope of delivery is al-
ways contractually agreed upon.
The condition of both the operating liquid and the conveyed media depend on the physical condi-
tions pressure and temperature.
At a very low pressures and sufficiently high temperatures the operating liquid can locally transfer
into the vapor phase, creating bubbles within the operating liquid. This process is called “cavitation”
and may deteriorate the machine and its performance, see Preventing Cavitation [➔22].
Recommended operating liquid (water) settings at various inlet pressures:
LR 0110 A
Speed
r/min
< 200 mbar
m³/h
200 - 400 mbar
m³/h
400 - 600 mbar
m³/h
> 600 mbar
m³/h
790
880
980
1100
1170
1300
1450
1.36 – 1.70
1.52 – 1.90
1.68 – 2.10
1.84 – 2.30
2.00 – 2.50
2.16 - 2.70
2.40 – 3.00
0.88 - 1.36
1.01 – 1.52
1.12 – 1.68
1.22 – 1.84
1.34 – 2.00
1.44 – 2.16
1.60 – 2.40
0.68 – 0.88
0.75 – 1.01
0.84 – 1.12
0.92 – 1.22
1.00 – 1.34
1.08 – 1.44
1.20 – 1.60
0.57 – 0.68
0.63 – 0.75
0.70 – 0.84
0.77 – 0.92
0.83 – 1.00
0.90 – 1.08
1.00 – 1.20

Installation | 5
Instruction Manual DOLPHIN LR 0110-0580 A_EN_en 15 | 40
LR 0140 A
Speed
r/min
< 200 mbar
m³/h
200 - 400 mbar
m³/h
400 - 600 mbar
m³/h
> 600 mbar
m³/h
790
880
980
1100
1170
1300
1450
1.68 – 2.10
1.84 – 2.30
2.08 – 2.6
2.32 – 2.9
2.48 – 3.1
2.72 – 3.4
3.03 – 3.79
1.12 – 1.68
1.22 – 1.84
1.38 – 2.08
1.54 – 2.32
1.66 – 2.48
1.84 – 2.72
2.05 – 3.03
0.84 – 1.12
0.92 – 1.22
1.04 – 1.38
1.16 – 1.54
1.23 – 1.66
1.32 – 1.84
1.47 – 2.05
0.7 – 0.84
0.77 – 0.92
0.87 – 1.04
0.97 – 1.16
1.03 – 1.23
1.10 – 1.32
1.23 – 1.47
LR 0210 A
Speed
r/min
< 200 mbar
m³/h
200 - 400 mbar
m³/h
400 - 600 mbar
m³/h
> 600 mbar
m³/h
565
660
740
820
880
920
980
2.64 – 3.30
3.12 – 3.90
3.52 – 4.40
3.92 – 4.90
4.16 – 5.2
4.40 – 5.50
4.69 – 5.86
1.76 – 2.64
2.08 – 3.12
2.34 – 3.52
2.62 – 3.92
2.78 – 4.16
2.96 – 4.4
3.15 – 4.69
1.32 – 1.76
1.56 – 2.34
1.76 – 2.34
1.96 – 2.62
2.08 – 2.78
2.16 – 2.96
2.30 – 3.15
1.10 – 1.32
1.30 – 1.56
1.47 – 1.76
1.63 – 1.96
1.73 – 2.78
1.80 – 2.16
1.92 – 2.30
LR 0300 A
Speed
r/min
< 200 mbar
m³/h
200 - 400 mbar
m³/h
400 - 600 mbar
m³/h
> 600 mbar
m³/h
565
660
740
820
880
920
980
3.12 – 3.90
3.68 – 4.60
4.16 – 5.20
4.64 – 5.80
4.96 – 6.20
5.20 – 6.50
5.54 – 6.93
2.08 – 3.12
2.46 – 3.68
2.78 – 4.16
3.10 – 4.64
3.31 – 4.96
3.44 – 5.20
3.67 – 5.54
1.56 – 2.08
1.84 – 2.46
2.08 – 2.78
2.32 – 3.10
2.47 – 3.31
2.64 – 3.44
2.82 – 3.67
1.30 – 1.56
1.53 – 1.84
1.73 – 2.08
1.93 – 2.32
2.06 – 2.47
2.20 – 2.64
2.35 – 2.82
LR 0420 A
Speed
r/min
< 200 mbar
m³/h
200 - 400 mbar
m³/h
400 - 600 mbar
m³/h
> 600 mbar
m³/h
472
500
530
590
660
710
740
790
4.9 – 6.1
5.1 – 6.4
5.4 – 6.8
6.1 – 7.6
6.8 – 8.5
7.3 – 9.1
7.6 – 9.5
8.1 – 10.1
4.1 – 4.9
4.3 – 5.1
4.6 – 5.4
5.1 – 6.1
5.7 – 6.8
6.1 – 7.3
6.4 – 7.6
6.8 – 8.1
2.4 – 4.1
2.6 – 4.3
2.7 – 4.6
3.1 – 5.1
3.4 – 5.7
3.7 – 6.1
3.8 – 6.4
4.0 – 6.8
2.1 - 2.4
2.2 - 2.6
2.3 - 2.7
2.6 - 3.1
2.9 - 3.4
3.1 - 3.7
3.2 - 3.8
3.4 - 4.0

5 | Installation
16 | 40 Instruction Manual DOLPHIN LR 0110-0580 A_EN_en
LR 0580 A
Speed
r/min
< 200 mbar
m³/h
200 - 400 mbar
m³/h
400 - 600 mbar
m³/h
> 600 mbar
m³/h
372
420
472
500
530
590
660
6.3 – 7.9
7.1 – 8.9
8.0 – 10.0
8.5 – 10.6
9.0 – 11.2
10.0 – 12.5
11.2 – 14.0
5.3 – 6.3
6.0 – 7.1
6.7 – 8.0
7.1 – 8.5
7.5 – 9.0
8.4 – 10.0
9.4 – 11.2
3.2 – 5.3
3.6 – 6.0
4.0 – 6.7
4.3 – 7.1
4.5 – 7.5
5.1 – 8.4
5.7 – 9.4
2.7 – 3.2
3.0 – 3.6
3.4 – 4.0
3.6 – 4.3
3.8 – 4.5
4.3 – 5.1
4.8 – 5.7
Water pressure before flow regulation valve
(once through operation only)
bar(g) 1
Max. allowable supply temperature °C 80
Max. allowable kinematic viscosity mm2/s 20
Consider the motor power for any-
thing other than water -
consult Busch.
Max. allowable particle size mm 0.2*
* For all operating systems make sure that no particles with a diameter larger than 0.2 mm will intrude
the machine, neither via the process gas nor via the operating liquid. Use suitable filtration as necessary.
The table below lists the recommended maximum levels of soluble compounds for use with ma-
chine in cast iron construction.
Calcium carbonate mg/l (ppm) < 300**
PH value 6.5 … 9.5
Chloride mg/l (ppm) < 700
Sulphates mg/l (ppm) < 200
Nitrites mg/l (ppm) < 500***
Total dissolved solids mg/l (ppm) < 1000
** to prevent excessive built-up of scale
*** provided long period of exposure to stagnant water is not foreseen
NOTE
Stainless steel version.
Please note that machines in all stainless steel material offer higher levels of corrosion resis-
tance and can be used for operation outside of the above limits. Chemical compatibility
should always be checked by competent personnel before use, particular attention should be
paid to elastomer material selection. If in doubt, please consult Busch.

Installation | 5
Instruction Manual DOLPHIN LR 0110-0580 A_EN_en 17 | 40
5.4 Fitting the Coupling
WARNING
Unprotected coupling.
Risk of severe injury!
●Make sure that the coupling is protected by a cover or a guard.
In case of a machine supplied without a motor:
●Fit a suitable coupling that matches the machine and motor shaft size.
●Make sure that the coupling is sized to withstand the full motor torque.
●Make sure that the coupling is correctly aligned according to the coupling instructions.
●Install a protective cover or a guard.
Machine type Machine shaft size (mm)
LR 0110 A & LR 0140 A 50
LR 0210 A & LR 0300 A 70
LR 0420 A 100
LR 0580 A 120

6 | Electrical Connection
18 | 40 Instruction Manual DOLPHIN LR 0110-0580 A_EN_en
6 Electrical Connection
DANGER
Live wires.
Risk of electrical shock.
●Electrical installation work must only be executed by qualified personnel.
CURRENT PROTECTION OF THE CUSTOMER INSTALLATION:
DANGER
Missing current protection.
Risk of electrical shock.
●Current protection according to EN 60204-1 must be insured by the customer on its installation.
●The electrical installation must comply with the applicable national and international standards.
NOTICE
Electromagnetic compatibility.
●Make sure that the motor of the machine will not be affected by electric or electro- magnetic dis-
turbance from the mains, if necessary seek advice from Busch.
●Make sure that the EMC of the machine is compliant with the requirements of your supply net-
work system, if necessary provide further interference suppression (EMC of the machine, see EU
Declaration of Conformity [➔35] or UK Declaration of Conformity [➔36]).
6.1 Machine delivered without Control Box or Variable
Speed Drive (VSD)
DANGER
Live wires.
Risk of electrical shock.
●Electrical installation work must only be executed by qualified personnel.
●Make sure that the power supply for the motor is compatible with the data on the nameplate of
the motor.
●If the machine is equipped with a power connector, install a residual current protective device to
protect persons in case of isolation default.
●Busch recommends installing a type B residual protective device suitable for the electrical in-
stallation.
●Provide a lockable disconnect switch or an emergency stop switch on the power line so that the
machine is completely secured in case of an emergency situation.

Electrical Connection | 6
Instruction Manual DOLPHIN LR 0110-0580 A_EN_en 19 | 40
●Provide a lockable disconnect switch on the power line so that the machine is completely secured
during maintenance tasks.
●Provide an overload protection according to EN 60204-1 for the motor.
●Connect the protective earth conductor.
●Electrically connect the motor.
6.2 Machine delivered with a Variable Speed Drive
(Option)
●If the machine is equipped with a power connector, install a residual current protective device to
protect persons in case of isolation default.
●Busch recommends installing a type B residual protective device suitable for the electrical in-
stallation.
●If the variable speed drive is not equipped with a lockable disconnect switch, provide it on the
power line so that the machine is completely secured during maintenance tasks.
●Provide an overload protection according to EN 60204-1.
●Connect the protective earth conductor.
NOTICE
Incorrect connection.
Risk of damage to the variable speed drive!
●The wiring diagrams given below are typical. Check the connection instructions/diagrams.
6.3 Wiring Diagram Three-Phase Motor
NOTICE
Incorrect direction of rotation.
Risk of damage to the machine!
●Operation in the wrong direction of rotation can destroy the machine in a short time! Prior to
start-up, ensure that the machine is operated in the right direction.
NOTICE
Incorrect direction of rotation.
Risk of damage to the vacuum system!
●Operating the vacuum system with the rotation in the wrong direction can result in the operating
liquid flowing back to the vacuum system. Prior to start-up, check for correct direction of rotation.

6 | Electrical Connection
20 | 40 Instruction Manual DOLPHIN LR 0110-0580 A_EN_en
The intended rotation direction of the motor is defined by the illustration below:
●Watch the fan wheel of the motor and determine the direction of rotation just before the fan
wheel stops.
If the rotation of the motor must be changed:
●Switch any two of the motor phase wires.
For motor wiring and wiring diagrams, please refer to motor manufacturers instruction man-
uals.