Vogt N Series User manual

2
Introduction
Introduction
This manual deals with the installation, operation and maintenance of VOGT N-Series
centrifugal pumps.
The operation of a centrifugal pump, chosen in accordance with all the technical
background, can deliver for various causes, a poor service. This is usually due to poor
installation and/or operation of the pumping equipment.
Efficient service is only achieved by installing and operating the pumping equipment
correctly, therefore, the instructions in this manual must be fully complied with.
Pumps should not be used for purposes other than the service conditions stipulated at
the time of purchase.
The nameplate installed on the pump describes the most important features of the equipment purchased.
The design, materials and workmanship incorporated in the construction of VOGT pumps allow for a long, trouble-free
service life. The life and satisfactory performance of the VOGT pumping equipment, in any case, depend on a correct
application, installation and, in addition, of a periodic inspection and careful maintenance.
VOGT S.A. will not be responsible for physical injury, damage or other inconveniences caused by improper installation,
operation or maintenance.
The warranty is only valid when the equipment is used for the application for which it was ordered.
For any questions or additional information concerning the installation, operation or maintenance of the pumping
equipment, contact qualified technical personnel by calling the head office or any authorized distributor.
VOGT S.A. reserves the right to make changes in design, dimensions, etc., at any time without notice and without
incurring any obligation.
The contents of this publication are based on the latest product information at the time of going to press.
No part of this publication may be reproduced without written permission from VOGT S.A.
This manual should be considered a permanent part of the pump and should remain with the pump if it is sold or moved.

3
Safety
Instructions
Indicates a procedure, operation, etc., with a strong possibility of severe personal injury, loss of life or irreparable
damage to equipment, if not performed properly.
Indicates a procedure, operation, etc., with a strong possibility of severe damage to the pumping equipment, if not
performed properly.
THE CONTENTS OF THIS MANUAL MUST BE READ AND UNDERSTOOD BEFORE INSTALLING AND OPERATING THE
PUMPING EQUIPMENT.
CAREFULLY READ AND UNDERSTAND THE MOTOR MANUAL, ATTACHED TO THIS MATERIAL, PROVIDED BY THE
MOTOR MANUFACTURER, BEFORE OPERATING THE PUMPING EQUIPMENT.
•Learn how to stop the pumping equipment quickly and understand the operation of all controls. Do not allow pumping
equipment to be used without proper instructions.
•Never place your hands, feet or any part of your body near rotating or moving parts.
•Never operate the pumping equipment if it is missing any protection from rotating parts.
•Always keep the pump at least one meter away from building walls or other equipment during operation to prevent fire
and to provide adequate ventilation.
•Always perform inspection before starting the pump. In this way you can avoid an accident or damage to the equipment.
•Children and domestic animals should not go near the place where the pump operates, let alone touch it, because they
could be injured by touching the equipment activated by the motor.
•Never place flammable items such as fuel, matches, etc., near the pump while it is running.
•Never place objects or items of any kind on the motor or pump, as this may create a fire hazard.
•Always maintain good cooling air circulation if the pump is to be operated in a small room.
!CAUTION
NOTE
!WARNING
!WARNING
2.1 Definitions
Provides useful information regarding a procedure, operation, etc., that facilitates the correct use of the pumping
equipment.
2.2 General Safety Considerations
Safety Instructions

4
Safety
Instructions
Safety Instructions
2.3 Qualification and Training of Operating Personnel
Personnel responsible for operation, maintenance, inspection and assembly must be suitably qualified and authorized.
The scope of responsibility and supervision of the personnel must be exactly defined by the plant operator. The plant
operator must ensure that the operating instructions are fully understood by the personnel.
2.4 Risks due to non-compliance with Safety Instructions
VOGT S.A. declines all responsibility that may arise from not respecting the safety standards in force at any time, during
the handling, installation or operation of its equipment.
The working conditions indicated in the order cannot be modified. Should this occur, VOGT S.A. must be informed.
Improper use outside the working conditions, or assembly/disassembly by untrained personnel may result in risks to
life, the pump and other accessories in use or normal operation of the equipment.
In order to benefit during the warranty period from the Guarantee offered by VOGT S.A., it is necessary to:
•The instructions in this manual have been correctly followed.
•The equipment is disassembled only by authorized personnel of our Technical Assistance
Services or directly by our factory personnel.
Any modification of the equipment must be previously consulted with VOGT S.A. For safety reasons, spare parts and
accessories authorized by VOGT S.A. must be used. The use of non-original spare parts exempts VOGT S.A. from any
responsibility.
!WARNING

Equipment
Description
Equipment Description
- 10 -
Figure 1
3.1 Pumping Equipment,
Main Components
1. Flange Discharge
2. Union Body
3. Bearing Body
4. Tap Cover
5. Coupling Tap
6. Electric Motor
7. Motor Lifting Eyebolt
8. Motor Terminal Box
9. Base
10.Leg Body Bearings Body
11.Pump
12.Suction Flange
13.Pressure Gauge Plug
14.Priming plug
15.Rotation Direction Arrow
16.Plug for Hand-Vacuum Gauge
17.Drain Plug
5
3.2 Identification Plate
The operation of a centrifugal pump, chosen in accordance with all the technical background, can give poor service for
various reasons. This is generally due to improper installation or mishandling of the pumping equipment. Efficient
service can only be achieved by installing the pump correctly, therefore, the instructions in this manual must be
complied with in their entirety. Pumps should not be used for purposes other than the service conditions stipulated at
the time of purchase. The nameplate installed on the pump describes the most important features of the equipment
purchased:
1. Serial Number
2. Flow Rate (m³/h)
3. Metallurgy Material and S. M. Spring
4. Sealing Type
5. Impeller Ø
6. Face Mat., S. M. Elastomers and Pump ORings
7. Lubrication Type
8. Bearing Body Type and Shaft Mat.
9. Wet End Pump Mat.
10.Pump Model
11.Pump Series
12.Head (mca)
13.Speed (rpm)
14.Year of manufacture Figure 2

6
Equipment
Description
Figure 3, Sectional Model 610
Equipment Description
3.3 N Series Centrifugal Pump
3.3.1 N Series Sectional Cutting
28.01
10.01
7T
11
30.02
1
30.09
30.01
25.01 25.02 9.01 9.02
5.02
10.02
25.03
25.04
6.01
5.0125.032338319.01 7
29.03
29.02
4
25.22
30.09
2
Figure 4, Sectional Models 620 - 621 - 626 - 626B - 627B - 628B - 629 - 629B - 630 - 630B 631 -
635 - 635B - 638 - 640 - 640B - 641 - 644 - 650V2 - 660V2 - 665 - 668
28.01
10.01
11
30.02
1
30.09
30.01
5.01 9.01 9.02
25.03
10.02
5.02
25.04
6.01
25.01 338 25.03 25.02
19.01
7
29.03
29.02
4
30.09
2

7
Equipment
Description
Equipment Description
3.3.1 N Series Sectional Cutting
Figure 5, Sectional Models 624, 624B y 628
Figure 6, Sectional Models 670
28.01
10.01
19.03
11
30.02
1
30.09
30.01
25.03
25.03
25.06
29.02
29.03
9.01
9.02
5.02
10.02
17.02
25.04
6.01
5.0125.0225.07 319.02
38 4 7
30.09
2
28.01
10.01
19.01
11
30.02
1
30.09
30.01
25.01 25.03
25.03
21.03
29.02
29.03
19.07
9.01 9.02
5.02
10.02
21.03
25.03
19.07
25.04
6.01
35.01 25.02 30.08 38
30.074 7
30.09
2

8
Equipment
Description
Impeller
Pump Body
Union Body
Body Bearing
Bearing Body Cover Pump side
Motor Bearing Body Cover
Leg Support Body Bearing
Shaft Body Bearing
Postizo Shaft
Pump Side Bearing
Motor Side Bearing
Impeller Key
Taps
Mechanical Seal
Union Body Ring
ORing Pump Body / Union Body
ORing Union Body / Ring
ORing Ring / Pump Body
ORing Tapa Cuerpo Rodamiento
Oil Seal Cover Bearing Body
Clamp
Pump Body Bolt / Union Body
Union Body Bolt / Bearing Body
Cover Bolt Body Bearing
Support Leg Bolt Body Bearing
Ring Bolt / Pump Body
Union Body Bolt / Ring
Clamp bolt
Shaft Nut
Pressure Grommet Bolt Leg Support C.R.
Flat Bolt Leg Support C.R.
Priming plug
Drain plug
Vent plug Bearing Body
Drain plug Body Bearing
Pressure Tap Plug
Oil Level Maintainer
Golilla Water Cutter
1
2
3
4
5.01
5.02
6.01
7
7T
9.01
9.02
10.01
10.02
11
17.02
19.01
19.02
19.03
19.07
21.03
23
25.01
25.02
25.03
25.04
25.06
25.07
25.22
28.01
29.02
29.03
30.01
30.02
30.07
30.08
30.09
32
38
NUM. DENOMINATION
Equipment Description
3.3.2 Description of N Series Pump Parts and Pieces
Table N° 1

9
Equipment
Description
Equipment Description
3.3.3 N Series Pump Dimensions
Figure 7

10
Equipment
Description
Equipment Description
3.3.3 N Series Pump Dimensions
Table Nº 2
Dimensions in Millimeters
Models
Flanges Pumps Legs Axis Seal Bearings

11
Transportation,
Storage and
Handling
Transportation, Storage and Handling
4.1 Transportation and Handling !WARNING
The pump and its components are heavy. Improper handling during handling and hoisting could cause serious personal injury
and/or damage to the equipment.
The transport and handling of the equipment must be carried out with means suitable for the weight to be supported; the weight
is generally indicated on the delivery note, if this is not the case and there is no certainty of being able to handle the equipment,
please contact VOGT S.A. to indicate the same. For the handling, the equipments that require it have appropriate eyebolts on the
bench. However, remember that the equipment must never be lifted by means of the eyebolts of each one of its elements, e.g.,
engine and pump eyebolts, which are exclusive for their independent transport. Neither should the flanges of pumps and pipes
be used, nor should connecting elements, e.g. couplings. In any case, if the equipment is to be lifted by means of slings, these
must pass under the pump and motor bodies.
4.2 Factory Packaging and Protections
After the painting phase, VOGT S.A. performs the following:
•All openings are sealed with plastic parts or plasticized adhesives.
•Depending on the type of packaging contracted, they are either placed on a wooden pallet and covered with heat-
weldable plastic, or placed in a cage-type wooden box or totally closed. In all cases the equipment is firmly secured to
prevent movement during transport and handling. These protections are exclusively for transport and at the most a
storage for a short period of time. In any case, the following storage instructions must be followed.
CAUTION
4.3.1 Before Storage !
Figure 8
•Storage should be in a place protected from the outside, away from shocks, solar radiation, dust, humidity and
flooding.
•The pumping equipment should not be stacked on top of each other, even if the type of packaging makes this possible.
•The pump and auxiliary lines should be kept clear of the pumping fluid.
•It is recommended to coat the unpainted parts of the pump with a protective material (such as petroleum jelly or
similar).
•Apply from the suction inlet oil or some anti-rust liquid in the wear ring areas, to avoid seizure.
•The electric motor shall be disconnected and the connection cables shall be removed and the terminal box shall be
closed with its cover.
•The electric boards shall remain in vertical position and disconnected.
4.3 Storage Instructions
These instructions are for storage less than 12 months from the date of shipment. If longer, please request instructions
for long term storage.

12
Transportation,
Storage and
Handling
Transportation, Storage and Handling
4.3.2 After Storage
•Remove the temporary protections and visually check the condition of all the elements.
•If the pump has been stored and/or stopped for a long period of time (more than 6 months), it is
necessary to renew the lubrication of the motor bearings as indicated in the motor manual.
•After a short storage period, it is sufficient to manually rotate the pump shaft to unlock the rotor
assembly.
•Carry out the instructions for after short storage specific to the motor and other manuals.
•Observe the other steps listed in the "Start-up" section.
If the equipment is going to be stopped for a certain period of time and there is danger of frost, it is necessary to drain the
pump completely to avoid its deterioration due to the possible freezing of the contained fluid.

13
Installation
!WARNING
•Pumps should always be installed in dry and clean locations. If the place of installation is humid, wet or with particles
in suspension, the appropriate motor should be selected for these conditions.
•When installing the pumping equipment, it should be protected from solar radiation, since this has a direct and
negative impact on the operation and useful life of the equipment, since it significantly increases the temperature and
accelerates the aging of paints and external surface finishes. Therefore, for equipment that is not installed in pump
rooms or similar, the installation of awnings or protective roofs should be considered.
•Sufficient space should always be left for disassembly and maintenance of the pump unit. In normal installations,
pumps should be located near the source of supply of the fluid to be pumped.
•Install the equipment well leveled and if possible on a solid concrete base with anchor bolts, to avoid vibrations and
displacements.
•The design of piping systems, anchorages and other areas of the installation is not the responsibility of VOGT S.A.
•VOGT S.A. only offers the data and comments as an aid, but cannot assume responsibility for the design, assembly
and operation of an installation. It is recommended that the client consult a specialist in the design of foundations,
piping, wells, etc. to complement and interpret the information provided by VOGT S.A. and to ensure correct operation.
THE PUMP AND ITS COMPONENTS ARE HEAVY. IMPROPER HANDLING DURING HANDLING AND HOISTING
COULD CAUSE SERIOUS PERSONAL INJURY, LOSS OF LIFE AND/OR DAMAGE TO EQUIPMENT.
5.1 Checking the Pump on Arrival
Check upon arrival that the pump and accessories have not been damaged or lost in transit. If so, immediately report the
damaged or missing parts to VOGT S.A., to the authorized distributor or to the company that carried out the transport.
VOGT S.A. provides its N series pumping equipment, whose bases are designed to be placed on the foundation and anchored
with bolts, as indicated later in this manual. The possibility of grouting the carbon steel bases to the foundation is at the
customer's discretion.
5.2 General Rules for Locating Pumps
Installation

14
Installation
Installation
5.3 Foundations
Most pumps give more satisfactory service when a rigid foundation is used. Foundations are usually made of concrete,
but can also be made of structural steel, in either case they must be sturdy and non-vibrating.
If the foundation surface is concrete, it must be set horizontal and flat before the pumping equipment is placed. The
space required for a pumping unit and the placement of anchor bolts are defined by the drawings supplied by the
manufacturer.
The unit can be supported on a generously dimensioned foundation. This foundation must be completely flat, smooth
and level. The unit shall be fastened to this foundation by means of suitable anchor bolts to avoid possible vibrations
due to operation.
5.4 Anchor Bolts
VOGT S.A. supplies the pumping equipment with bases, these must be anchored to the foundation by means of anchor
bolts, as shown in figure 9 and applying the tightening torque according to table N° 3.
Once the process has been completed, it is advisable to mount a locknut on the bolt nuts to prevent them from
loosening during operation of the equipment.
AA Cutting
N series equipment base
Anchor bolt to foundation
Safety locknut
Tightening nut
Concrete foundation
ANCHORING CARBON STEEL BASES
400
Table 3: Anchor Bolt Tightening Torque
Base Carbon Steel
Ø Nominal Bolt Tightening torque
(Inch)(Nm)
5 / 8 130
3 / 4 200
7 / 8 300
1
Figure 9

15
Installation
·Velocity in delivery pipe: 2 to 3 m/s.
·Velocity in suction pipe: 1 to 2 m/s.
To avoid pump cavitation, the available NPSH of the suction piping system must be higher than the NPSH required by the
pump. This is achieved by lowering the head loss of the suction piping, increasing its diameter, minimum possible
length, minimum number of fittings, not exceeding the required flow rate, low temperature (minus 33ºC if water),
minimum negative head and even better if the suction is positive.
If a long suction line is required, it should be installed with a continuous elevation slope in the direction of the pump and
without high points, to avoid the accumulation of air pockets, see figure 11.
For optimum operation of the motor-pump equipment, the piping should not exert stresses on the equipment. The
equipment can be deformed, broken or misaligned when the piping is not aligned with the axes corresponding to the
suction and discharge of the pump. The position of the suction and discharge ports must be totally parallel and with their
axes concentric to the pipes, in order to minimize stresses in the pump necks that deform it or produce a misalignment of
the axes. Do not forget to place gaskets between the joints.
Do not use the pump as a fastening point for the installation. The suction and delivery pipes must not produce stresses on
the suction and discharge ports of the pump that may exceed their maximum values. The pipes must be fixed to the walls
or floors of the pump room in such a way that the pump is not subjected to their weight, see figure 10.
!CAUTION
CHECK VALVE
CHECK VALVE
The diameters of the pipes, valves and fittings must be calculated according to the expected head losses in the installation
and in such a way that the fluid velocities are:
Figure 11
Installation
5.5 Joints to Rigid Pipe System
Figure 10

16
Installation
Figure 12
The elbows and fittings installed in the pump suction must be selected and installed in such a way that the liquid enters the
impeller in a symmetrical and orderly manner, this is achieved by installing a section of pipe of the same diameter as the
pump suction and a length of 10 times that diameter, Figure 12.
The end of the suction pipe, which goes at the source of the fluid, must be submerged at least 4 times its diameter to avoid
the formation of vortices, which cause air to pass into the pump and cut off the liquid flow, figure 13.
After the suction and discharge pipes have been installed, they should be cleaned of any debris before starting up the
equipment, in order to avoid damage to the pump and other equipment installed in the system.
It is advisable to use a suction strainer in the suction pipe, amply dimensioned to prevent the entry of dirt larger than the
size allowed by the pump. Avoid sharp bends and fittings that narrow or widen abruptly (cones, valves, etc.).
The discharge piping should generally be larger in diameter than the pump discharge port. A gate valve should also be
fitted to regulate the flow rate and prevent possible overloading of the motor, as well as to isolate the pump during
maintenance. To prevent fluid backflow from the delivery line, it is recommended that a check valve be placed in the
delivery line between the pump and the control valve.
If the pump is in negative suction, the suction pipe must be absolutely stagnant and always rising towards the pump, with
diameter generally larger than the suction port of the pump. The diffuser cone for the adaptation shall be eccentric with the
upper part horizontal. Check that, at the normal working point, the NPSH required by the pump is at least 0.5 m lower than
the available NPSH of the installation. To prevent the pump from overpriming at a standstill, a foot valve should be placed
at the end of the suction pipe. It is recommended that the length of the cone diffusers be at least 7 times the difference of
the nominal diameters of the inlet and outlet of the cone, see figure 13.
CHECK VALVE
CHECK VALVE
If the pump sucks under load, the suction pipe must be stagnant and with a diameter generally larger than the pump mouth. The
diffuser cone can be eccentric or concentric. Install a gate valve for isolation during maintenance, see figure 14.
Installation
If a reduction is installed in the suction line, it should be eccentric and its straight part should be at the top, to facilitate the exit
of trapped air bubbles to the pump, see figure 12.
Figure 13Figure 14

17
Installation
CHECK VALVE
EXPANSION JOINT
EXPANSION JOINT
Figure 15
5.7 Alignment
Pumping equipment is assembled and aligned at the
factory by qualified personnel, however, during
transportation or handling, the equipment can suffer
stresses that can cause misalignment between the
pump and the motor, which can lead to bearing and
coupling failures. Therefore it is important to check and
correct the alignment when necessary, see illustration
14. If the equipment handles high temperature fluids,
the final alignment should be done with the equipment
at operating temperature.
The equipment should always be aligned after
everything is assembled and ready for start-up. The
correct alignment of the standard coupling consists of
correcting the possible errors of parallelism and
concentricity, using calibrated laims in the motor.
Angular Misalignment
Parallel Misalignment
Figure 16
Installation
5.6 Expansion Joint
Dimensional changes in piping and equipment, caused by variations in the working temperature of the piping system and the
pump, either by the temperature of the pumped fluid or by exposure to changing environmental conditions, result in large
magnitude stresses and forces that are transmitted to the pumping equipment and can damage it. That is why VOGT S.A.,
recommends the use of expansion joints as part of the piping system that connects to the pump, when conditions warrant it, see
figure 15.
Even though the absorption of axial movements, caused by temperature changes, is the main work performed by the expansion
joints, they also act as vibration isolators reducing the propagation of vibrations, produced by the operation of the equipment,
through the piping system and also act as compensators of lateral, angular and torsional movements.

18
Start-up
•Disconnect the motor from the mains.
•Remove the priming plug located on the upper part of the pump body.
Figure 17.
•Pour liquid through the delivery pipe until it overflows through the
priming hole.
•While priming, rotate the pump shaft by hand to break any sticking.
•Replace the priming plug in its position.
Never run a pump dry. Most centrifugal pumps have a mechanical seal or stuffing box, therefore they cannot be run dry
under any working conditions, otherwise the sealing elements will be seriously damaged.
Before starting the pump, the suction pipe must be completely filled with the fluid to be pumped, this allows the pump to
start always primed and prevents the accumulation of air in the suction system. The procedure is as follows:
6.2 Pump Priming
6.3 Minimum Flow Rate
It must be taken into account that there is a minimum flow rate at which the pump must work, which is given by the
temperature of the pumped fluid, according to the following table.
0 < T < 50 ºC => 20% of the maximum efficiency point flow rate.
50 < T < 80 ºC => 30% of the maximum efficiency point flow rate.
6.4 Pumped Fluid Density
The power required for pump operation increases directly with the density of the pumped fluid. In order not to overload the
electric motor, it must be ensured that the pumped fluid corresponds to that which was originally considered for the
selection of the pump and its motor.
!CAUTION
Start-up
6.1 Before start-up
After a pump has been installed and all mechanical, hydraulic and electrical connections have been made, it is ready for
commissioning. However, prior to initial start-up, the following is recommended:
Figure 17

19
Start-up
It is important to check before the first start-up that the technical specifications of the motor, which come on the nameplate,
correspond to the technical characteristics required by the pump and those of the place where the motor is going to operate.
Verify that:
•The characteristics of the mains supply, voltage, number of phases, frequency, and amperage match those of the
motor.
•The electrical panel must be suitable for the type of motor drive, direct start or star-delta.
•The degree of insulation and protection of the motor must correspond to the conditions in which it will operate.
Before final start-up, it is necessary to check the direction of rotation to prevent damage to the thrust assembly. The
direction of rotation of the motor is correct when it coincides with the direction indicated by the arrow cast on the pump
casing (counterclockwise when looking at the motor facing the shaft), see section, 6.5.2.- Checking the Direction of
Rotation.
Start-up
6.5 Engine Considerations !CAUTION
6.5.1 Instructions for the Connection of Three Phase Electric Motors
To make a delta connection, the bridges are placed in the electric motor box connecting: U with Z, V with X, W with Y. The
wires from the electric panel to the motor junction box connect the terminals: U to U, V to V, W to W, (see fig. No. 18-a).
To make the star connection connect together the three terminals: X-Y-Z of the junction box and connect the terminals U-V-
W with the corresponding terminals U-V-W on the electric panel. The power supply terminals R-S-T must be connected to
the power supply busbars or terminals on the electrical panel (fig. No. 18-b).
Figure 18 a Figure 18 b Figure 18 c
Electrical
Panel
Electrical
Panel
Electrical
Panel

20
Start-up
Designation of the Power Cables of
the Three-Phase Lines By Different
Manufacturers
R = L1
S = L2
T = L3
Designation of Cables and Terminals of
Three-Phase Electric Motor Coils by
Different Manufacturers
X
Y
Z
4
5
6
U2
V2
W2
=
=
=
=
=
=
U1
V1
W1
=
=
=
U
V
W
1
2
3
=
=
=
6.5.2 Rotation Management Control
Before final start-up, it is necessary to check the direction of rotation to ensure correct operation of the pump.
Correct direction of rotation
The motor cables are marked with the letters U-V-W, and should be connected to the corresponding U-V-W terminals on the
control panel. Identify and mark the power supply terminals R-S-T, using a cyclic phase detector with a clockwise rotating
indicator, and connect them to the R-S-T terminals on the control panel.
If you do not have a cyclic phase detector, precede as indicated. Connect the power supply cables to the control panel and to
the power supply circuit, just for a moment, and observe in which direction the motor-pump assembly tends to rotate. The
direction of rotation of the motor is correct when the assembly tends to rotate in the direction indicated by the arrow cast on
the pump. If the motor pump tends to rotate in the opposite direction to that indicated by the arrow, reverse the position of
any two power cables and you will obtain the correct direction of rotation.
6.6 Other General Operating Considerations
DO NOT throttle the suction of the pump; throttling the suction of a centrifugal pump causes a reduction of the absolute
pressure at the impeller inlet. This is very harmful for the pump, since it causes erosion and premature destruction of its
components, product of the phenomenon called cavitation. Suction throttling is only allowed when the available NPSH of the
installation exceeds by a wide margin the NPSH required by the pump.
If the pump is stalled or rotates with difficulty, the equipment must not be operated until the cause of the problem is located
and solved.
Start-up
Motors with 6 wires can be started using a Star/Delta splitter only if the supply line voltage is equal to the minimum voltage
shown on the nameplate, between the two values specified by the manufacturer. To make the star-delta connection, in the
motor box, all jumpers are removed, leaving the terminals free. The 6 wires from the board to the motor connect the 6
terminals of the board to the 6 terminals of the motor junction box as follows: U to U, V to V, W to W, Z to Z, X to X, Y to Y
(see fig. No. 18-c).