Grundfos MS 4000, MS 402, MS 6000, MS 4000 RE, MS 6000 R Product Manual

GRUNDFOS

PRODUCT GUIDE

MS

Submersible Motors

60 Hz

Contents

Contents

Mission

Product data

Introduction 4
Grundfos MS Motors Introduction 4
MS Motor Selection 4
Product Range 5
Model Designation 6
Nameplate 6

Features

MS 402 7
MS 4000 8
Special Construction Features 8
MS 6000 9
Special Construction Features 9

Operating Conditions

Operating Conditions 10
MS 402 11
MS 4000 12
MS 6000 13

Construction

Material specification for MS 402 14
Material specification for MS 4000 15
Material specification for MS 6000 16

Technical Data

Outline Drawing MS 402 26
Dimensions and Weights MS 402 26
Outline Drawing MS 4000 27
Dimensions and Weights MS 4000 27
Outline Drawing MS 6000 28
Dimensions and Weights MS 6000 28

Electrical Data

Grundfos Motors Specifications 29
Transformer Capacity 31
Engine-Driven Generators 32
Motor Protection Chart 33
Motor Cable Selection Chart
(Motor Service to Entrance) 35
Single Phase, 60 Hz 35
Three Phase, 60 Hz 35

Accessories

CU 3 37
Benefits of CU 3/R100 38
Control functions 39
Features and benefits 40
Motor protection via CU 3 41
Control unit CU 3 with R100
remote control and printer 41
R100 Menus 42
Menu Structure of the R100 Remote Control 43
Complete Borehole Monitoring
System with CU 3 and SM 100 44

Selection

Motor Operation 17
Motor Loading, Failure and Lifetime 17
Motor Efficiency 18
Application and Selection Issues 19

Mechanical Installation

Submersible Motor Cooling 20
Required Cooling Flow and Velocity 20
Water Temperature and Motor Derating 20
Shroud/Flow Inducer Sleeve/Cooling Sleeve 21
Special (Non Water Well) Applications 22

Electrical Installation

Submersible Power Cable 24
Cable Selection 25

Further product documentation

Sources of product documentation 45
WinCAPS® 45
WebCAPS® 46

2

Mission

- to successfully develop, produce, and sell high quality
motors and pumping systems worldwide, contributing to a
better quality of life and healthier environment

GBJ - Bjerringbro, Denmark

GMU - Fresno, California GPU - Olathe, Kansas

GMX - Monterrey, Mexico GPA - Allentown, Pennsylvania GCA - Oakville, Ontario

• One of the 3 largest pump companies in the world

• The second largest manufacturer of submersible motors in the world

• World headquarters in Denmark

• North American headquarters in Kansas City - Manufacturing in Fresno, California

• 60 companies in 40 countries

• More than 10 million motors and pumps produced annually worldwide

• North American companies operating in USA, Canada and Mexico

• Continuous reinvestment in growth and development enables the company to

BE responsible, THINK ahead, and INNOVATE

3

Product data

MS Motors

Introduction

Grundfos MS Motors Introduction

Grundfos Submersible motors are designed specifically
for operation in and under water.

The motor and power cable are designed and sealed to
prevent water from contacting any part of the electrical
circuit.

The motors are equipped with a high-capacity thrust
bearing to support the total thrust of the pumping unit.

The Grundfos submersible motor depends on
surrounding water to carry away heat; most require a
specified flow of water for adequate cooling.

MS Motor Selection

Selecting the best submersible motor for a particular
pump application requires careful consideration of
several factors. The motor must match the pump in
mounting dimensions, and must also have adequate Hp
load rating and thrust rating to support the pump over
its entire operating range. Grundfos 4” and 6” submers­ible motors are built to NEMA standards, which define
their physical dimensions, electrical ratings, and thrust
ratings. The motor must be capable of operation at the
water temperature and velocity presented by the instal­lation.

Grundfos literature specifies the maximum water
temperature and minimum required velocity past the
motor. Motor operation in water that exceeds the rated
temperature may be allowable at reduced loading,
depending on the particular motor.

If the installation does not assure the specified velocity
past the motor- because of well diameter, well inflow
above the pump or other reasons - a sleeve over the
motor should be used to induce the required velocity.

4

Product data

MS Motors

Product Range

MS 402 MS 4000 (R) MS 6000 (R)

Motor size

Hp Kw Hp Kw Hp Kw

Power range, direct-on-line

- 1 x 115 V .50 .37 - - - -

- 1 x 230 V .33 - 1.50 .25 - 1.1 2.0 - 5.0 1.5 - 4.0 - -

- 3 x 230 V .50 - 2.0 .37 - 1.50 3.0 - 7.5 2.2 - 5.5 7.5 - 30.0 5.5 - 22.0

- 3 x 460 V .50 - 2.0 .37 - 1.50 3.0 - 10.0 2.2 - 7.5 7.5 - 40.0 5.5 - 30.0

- 3 x 575 V .50 - 2.0 .37 - 1.50 3.0 - 10.0 2.2 - 7.5 7.5 - 40.0 5.5 - 30.0

Allowed installation

- Vertical .33 - 2.0 .25 - 1.5 2.0 - 10.0 1.5 - 7.5 7.5 - 40.0 5.5 - 30.0

- Horizontal .33 - 2.0 .25 - 1.5 2.0 - 10.0 1.5 - 7.5 7.5 - 40.0 5.5 - 30.0

4" 4" 6"

5

Product data

MS Motors

Model Designation

MS 402

Example MS 4 02

Motor Submersible

Min. borehole
diameter in inches

Generation

- = Stainless Steel AISI 304

MS 4000

Example MS 4 000 R

Motor Submersible

Min. borehole
diameter in inches

Generation

- = Stainless Steel AISI 304
R = Stainless Steel AISI 904L
I = Stainless Steel AISI 304 + De-rated
RE = Stainless Steel AISI 904 L + FKM
EI = Stainless Steel AISI 304 + De-rated + FKM

Nameplate

MS402

PH1 Hz60 XX.X
XXXX
VAC

CONT.

DUTY
WEIGHT
CONTROLBOX
THERMALLY PROTECTED

MS4000

PH1 Hz60 XX.X
XXXX
VAC

DUTY

CONT.
WEIGHT

THERMALLY PROTECTED

XX

XXX

XXX

+

XXXF

+

XXX

PROD.NO.
PC.

XXX

F
XX.X
XX.X

Lb

XXXXXXXX

PC.

XXX

F
XX.X
XX.X

F
Lb

XXXXXXXXCONTROLBOX

XXXXXXXX

P1

YYWW

X.XX

HP

SF
CODE
RPM
COSMAX.AMPS

0.5

ft/s INS.CL.

3w

MADE IN DENMARK

XXXXXXXXPROD.NO.

P1 YYWW

X.XX

SF

HP

CODE
RPM
COSMAX.AMPS

0.5

ft/s INS.CL.

MADE IN DENMARK

X
XXXX
X.XX

X

TM03 0542 0502TM03 0543 0502TM03 0544 0502

XXX
XXXX
X.XX

X

MS 6000

Example MS 6 000 R

Motor Submersible

Min. borehole
diameter in inches

Generation

- = Stainless Steel AISI 304
R = Stainless Steel AISI 904L
I = Stainless Steel AISI 304 + De-rated
RE = Stainless Steel AISI 904 L + FKM
EI = Stainless Steel AISI 304 + De-rated + FKM

MS6000

Hz

3
VAC

X
MAX.SF.AMPS
COS
RPM
CONT.DUTY
WEIGHT

XXX

PC.

XXX
XX.X
X.XX
XXXX

XXX 0.5

F

Lb

XXXXXXXXPROD.NO.

P1 YYWW

X.XXXX.X60

SF CODE X

HP

XXX

-

XX.X

-

X.XX

-

XXXX

-

ft/s

INS.CL.

MADE IN DENMARK

X

6

Features

MS 402

MS Motors

• Complete Range of Motors from 1/3 - 2 Hp 1 ph,
2-wire; 3-wire and 3 Ph.

• Designed for 4" and Larger Wells

• Corrosion Resistance All Stainless Steel Exterior
Construction

• Cast Stainless Steel Machined Top

• Stainless Steel Splined Shaft

• Stator Windings Hermetically Encapsulated in Stain­less Steel

• Polyurethane Self Healing Resin

• 900 lb. Thrust Rating

• Water Lubricated

• Internal Water Circulation System Enhances Motor
Cooling

• No Cooling Sleeve Needed up to 85°F

• Rated up to 104°F with 1/2 ft./sec. flow Past
the Motor

• Filter Check Valve

• Michell Type Carbon/Ceramic Thrust Bearing

• Pressure Equalization Diaphragm

• Sand Slinger

• Bellows Type Shaft-Seal

• Epoxy Coated Bearing Support

• Built-In Surge Protection

• Replaceable Motor Lead

• NEMA Mounting Dimensions

• UL Recognized

• CSA Certified



2-wire motors are only available up to 1.5 Hp

65495 0205

7

Features

MS 4000

MS Motors

• Complete Range of Motors from 3 - 10 Hp 1 ph,
3-wire and 3 Ph.

• Designed for 4" and Larger Wells

• Corrosion Resistance All Stainless Steel Exterior
Construction

• Stainless Steel Splined Shaft

• Stator Windings Hermetically Encapsulated in Stain­less Steel

• Water Lubricated

• Internal Water Circulation System Enhances Motor
Cooling

• No Cooling Sleeve Needed up to 85°F

• Rated up to 104°F with 1/2 ft./sec. flow Past
the Motor

• Filter Check Valve

• Michell Type Carbon/Ceramic Thrust Bearing

• 1500 lb. Thrust Rating

• Pressure Equalization Diaphragm

• Sand Slinger

• Tungsten Carbide/Ceramic Shaft-Seal, for Long Life
in Sandy Applications

• Steel Bearing Support

• 7 1/2 and 10 Hp Equipped with Tempcon
Temperature Sensor

• 3 Ph Motors Work with MTP 75 and CU 3 Motor Pro­tection System

• Replaceable Motor Lead

• NEMA Mounting Dimensions

• CSA Certified

8

Special Construction Features

• Available in a 904L Grade of Stainless Steel and/or
FKM, for aggressive Applications

• Available In an Industrial Version for
Industrial Applications

• Designed for Long Life and Lower operating Costs.

 Tempcon optional on 3 and 5 HP

65492 0205

Features

MS 6000

MS Motors

• Complete Range of Motors from 7 1/2 - 40 Hp 3 Ph

• Designed for 6" and Larger Wells

• Corrosion Resistance All Stainless Steel Exterior
Construction

• Stainless Steel Splined Shaft

• Stator Windings Hermetically Encapsulated in Stain­less Steel

• Water Lubricated

• Internal Water Circulation System Enhances Motor
Cooling

• No Cooling Sleeve Needed up to 85°F

• Rated up to 104°F with 1/2 ft./sec. flow Past
the Motor

• Filtered Check Valve

• Michell Type Carbon/Ceramic Thrust Bearing

• 6000 lb. Thrust Rating

• Pressure Equalization Diaphragm

• Sand Slinger

• Tungsten Carbide/Ceramic Shaft-Seal, standard

• Optional Silicon/Carbide Shaft-Seal, for Long Life in
Sandy Applications

• Steel Bearing Support

• Equipped With Tempcon Temperature Sensor as
Standard

• Work with MTP 75 and CU 3 Motor Protection
System

• Replaceable Motor Lead

• NEMA Mounting Dimensions

• CSA Certified

Special Construction Features

• Available in a 904L Grade of Stainless Steel and/or
FKM, for aggressive Applications

• Available In an Industrial Version for
Industrial Applications

• Designed for Long Life and Lower operating Costs.

GR7291

9

Operating Conditions

Operating Conditions

Cooling

The cooling of the motor depends on the temperature
and the flow velocity of the pumped liquid past the
motor.

To ensure sufficient cooling, the values for maximum
temperature of the pumped liquid and its flow velocity
must be kept.

It is reccomended always to ensure a minimum cooling
flow of 0.50 f/s.

Free Convection

Free convection is achieved when the diameter of the
borehole is at least 2" (~ 50 mm) bigger than the outer
diameter of the motor.

The motor should always be installed above the bore­hole screen. If a flow sleeve is used, the motor can be
placed in the screen.

Calculation of the flow velocity:

Q

------------------------------------------------- -

v

2826 D

min

2

⎛⎞

×

i

⎝⎠

f/s=

2

d

–

A

MS Motors

Required data:

: Flow in gpm

Q

min

: Borehole diameter in inches

D

i

dA: Motor diameter in inches

D

motor

N

D

borehole

Fig. 1 Drawing for cooling flow

TM02 2269 4001

10

Operating Conditions

MS 402

Pumped Liquids

MS 402 is generally recommended for operation in
water without any appreciable amount of chloride at
common groundwater temperatures.

• MS402 is made of 304 stainless steel AISI

Sand Content

Max. sand content in pumped liquid: 50 ppm.

Ambient Pressure

Max. 20 bar ~ 290 psi.

It is generally not recommended to install the motor for
operation in a vacuum.

MS Motors

Cooling

Cooling of the motor depends on temperature and
velocity of flow of the pumped liquid past the motor. In
order to ensure sufficient cooling, the values for max.
temperature of the pumped liquid and its velocity of flow
past the motor stated in the table to the right must be
kept.

Note: The temperature limits are based on the condi­tion that the other operating conditions are as specified
in this Product Guide.

In case the actual temperature of the pumped liquid is
higher than the one stated in the table, or if the oper­ating conditions are especially unfavourable, please
contact Grundfos.

Free Convection

Free convection is achieved when the diameter of the
borehole is at least 2" (~ 50 mm) bigger than the outer
diameter of the motor, or if the motor is installed in the
borehole screen.

Velocity of Flow Past

the Motor

0.0 f/s
(Free Convection)

Min. 0.25 f/s

Fig. 2 Free Convection

Max. Temperature of Pumped Liquid

Vertical

Installation

30°C

(86°F)

40°C

(104°F)

Horizontal

Installation

Flow sleeve

recommended

40°C

(105°F)

ø95

ø145

TM00 5122 5094TM00 5123 5094

Fig. 3 Flow of Pumped Liquid past the Motor

11

Operating Conditions

MS 4000

Pumped Liquids

The MS 4000 motors are available in several versions
to enable use in various liquids.

• MS 4000 is generally recommended for use in water
without chloride.
MS 4000 is made of 304 stainless steel AISI

• MS 4000 R is recommended for use in aggressive
liquids.
MS 4000 R is made of 904L stainless steel AISI

• MS 4000 RE is recommended for use in aggressive
and slightly contaminated liquids.
MS 4000 RE is made of 904L stainless steel AISI,
and the original rubber parts have been
replaced with FKM.

In cases of doubt, please make an analysis of the liquid
and contact Grundfos.

MS Motors

Sand Content

Max. sand content in pumped liquid: 50 ppm.

Ambient Pressure

Max. 60 bar ~ 870 psi.

It is generally not recommended to install the motor for
operation in a vacuum.

Cooling

Cooling of the motor depends on temperature and
velocity of flow of the pumped liquid past the motor. In
order to ensure sufficient cooling, the values for max.
temperature of the pumped liquid and its velocity of flow
past the motor stated in the table to the right must be
kept.

It is recommended to always install the motor in the
borehole screen.

Note: The temperature limits are based on the condi­tion that the other operating conditions are as specified
in this Product Guide.

In case the actual temperature of the pumped liquid is
higher than the one stated in the table, or if the oper­ating conditions are especially unfavourable, please
contact Grundfos.

Free Convection

Free convection is achieved when the diameter of the
borehole is at least 2" (~ 50 mm) bigger than the outer
diameter of the motor, or if the motor is installed in the
borehole screen.

Velocity of Flow Past

the Motor

0.0 f/s
(Free Convection)

Min. 0.25 f/s

Fig. 4 Free Convection

Max. Temperature of Pumped Liquid

Vertical

Installation

30°C

(86°F)

40°C

(104°F)

motor

D

D

borehole

Horizontal

Installation

Flow sleeve

recommended

40°C

(105°F)

TM00 5688 1395

12

Operating Conditions

MS 6000

Pumped Liquids

The MS 6000 motors are available in several versions
to enable use in various liquids.

• MS 6000 is generally recommended for use in
common groundwater.
MS 6000 is made of 304 stainless steel AISI.

• MS 6000 R is recommended for use in aggressive
liquids.
MS 6000 R is made of 904L stainless steel AISI.

• MS 6000 RE is recommended for use in aggressive
and slightly contaminated liquids.
MS 4000 RE is made of 904 stainless steel AISI,
and the rubber parts are made of FKM.

In cases of doubt, please make an analysis of the liquid
and contact Grundfos.

Sand Content

Max. sand content in pumped liquid: 50 ppm.

MS Motors

Ambient Pressure

Max. 60 bar ~ 870 psi.

It is generally not recommendable to install the motor
for operation in a vacuum.

If this cannot be avoided, please contact Grundfos for
guidance.

Cooling

Cooling of the motor depends on temperature and
velocity of flow of the pumped liquid past the motor. In
order to ensure sufficient cooling, the values for max.
temperature of the pumped liquid and its velocity of flow
past the motor stated in the table to the right must be
kept.

Free Convection

Free convection is achieved when the diameter of the
borehole is at least 2" (~ 50 mm) bigger than the outer
diameter of the motor.

Velocity of Flow Past

the Motor

0.0 f/s
(Free Convection)

Min. 0.25 f/s

Max. Temperature of Pumped Liquid

Vertical

Installation

30°C

(86°F)

40°C

(104°F)

motor

D

Horizontal

Installation

Flow sleeve

recommended

40°C

(105°F)

Fig. 5 Free Convection

D

borehole

TM00 5688 1395

13

Construction

MS Motors

Material specification for MS 402

Standard Version

Pos. Component Material AISI

1a Plug Plastics, PELD

2 Shaft Stainless steel 431

2a Stop ring (upthrust) Polyethylene, PP

5c Housing for radial bearing Silumin

Radial bearing,

5b

stationary

6 Bearing journal Tungsten carbide

7 Filling compound Polyurethane

8 Stator sleeve Plastics, PET

9 Stator winding Copper wire

10 Stator housing Stainless steel 403

Radial bearing,

11

stationary

12 Bearing journal Tungsten carbide

13 Intermediate ring Sintered steel

Thrust bearing ring,

14

rotating

Thrust bearing shoes.

15

stationary

16 Rotor lamination Magnetic sheet steel

17 Stator lamination Magnetic sheet steel

21 Nut Stainless steel 304

22 Staybolt Stainless steel 304

25 Cover plate Stainless steel 304

25a Screw Stainless steel 304

27 Sand shield NBR rubber

32 Bellows seal NBR rubber

32a Lock ring Composite PPS

50,

Screw Stainless steel 304

74

Rotor rods

Motor liquid SML-2

Ceramic

Ceramic

Ceramic

Carbon

Cast aluminium or cop­per

Example: MS 402

25

32

25a

5b

6

•

•

•••

••

••••••

•••••••••••••••

•••••

••••••••••••••

••••••

•••••••••••••••

•••••

••••••••••••••

••••••

•••••••••••••••

•••••

••••••••••••••

••••••

•••••••••••••••

•••••

••••••••••••••

••••••

•••••••••••••••

•••••

••••••••••••••

••••••

•••••••••••••••

•••••

••••••••••••••

••••••

•••••••••••••••

•••••

••••••••••••••

••••••

•••••••••••••••

•••••

••••••••••••••

••••••

2b

9

8

•••••••••••••••

•••••

••••••••••••••

••••••

•••••••••••••••

•

•••••

••••••••••••

•

••••••

••••••••••••

•

•••••

••••••••••••

•

••••••

••••••••••••

•

•••••

••••••••••••

•

••••••

••••••••••••

•

•••••

••••••••••••

•

•

•

•••••

•

•

••

•

•

••

•

•

•

•

•

••

•

•

•

•

•

••

•

•

•

•

•

••

•

•

•

•

•

••

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•••

•

•

•

••••

•

•

•

•••••

•

•

••••••

•

•

•

•••••••

•

•

•••••••

•

•

•

••••••••

•

•

••••••••

•

•

•

•••••••••

•

•

••••••••

•

•

•

•••••••••

•

•

••••••••

•

••

•

••••••••

•

•

••••••••

•

••

•

••••••••

•

•

•••••••

•

••

•

•••••••

•

•

10

16

17

•••••••

•

•

•••••••

••

•

••••••••

•

•

••••••••

••

•

••••••••

•

•

••••••••

••

8

14

15

13

•

•••••••••

•

••••••••

•

••••••••

•

••••••••

•

••••••••

•

•••••••

•

•••••••

•

••••••

•

•••••

•

••••

•

•••

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•••••••••••••••••••••••

•••••••••••••••••••••••

•••••••••••••••••••••••

•••••••••••••••••••••••

•••••••••••••••••••••••

•••••••••••••••••••••••

•••••••••••••••••••••••

••••••••••••••••••••••••••

••••••••••••••••••••••••••

••••••••••••••••••••••••••

••••••••••••••••••••••••••

••••••••••••••••••••••••••

••••••••••••••••••••••••••

••••••••••••••••••••••••••

••••••••••••••••••••••••••

••••••••••••••••••••••••••

••••••••••••••••••••••••••

••••••••••••••••••••••••••

••••••••••••••••••••••••••

••••••••••••••••••

•••••••••••••••••

••••••••••••••••••

•••••••••••••••••

••••••••••••••••••

•••••••••••••••••

••••••••••••••••••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•••••

••

•

50

•••

•••

•••

•••••

••••

••••

••••

••••

•••

••••

•••

••••

•••

•••

•••

•••

•••

•••

••

••••

•••••

••••••

•••••••

••••••••

••••••••

••••••••

••••••••

••••••••

••••••••

••••••••

••••••••

••••••••

••••••••

••••••••

••••••••

••••••••

••••••••

••••••••

••••••••

••••••••

••••••••

••••••••

••••••••

••••••••

••••••••

••••••••

••••••••

•••••••

••••••

•••••

••••

••••••••••••••••••••••••

••••••••••••••••••••••••••

••••••••••••••••••••••••

••••••••••••••••••••••••••

••••••••••••••••••••••••

••••••••••••••••••••••••••

••••••••••••••••••••••••

•••••••••••••••••••••••••••

••••••••••••••••••••••••••

•••••••••••••••••••••••••••

••••••••••••••••••••••••••

•••••••••••••••••••••••••••

••••••••••••••••••••••••••

•••••••••••••••••••••••••••

••••••••••••••••••••••••••

•••••••••••••••••••••••••••

••••••••••••••••••••••••••

•••••••••••••••••••••••••••

••••••••••••••••••••••••••

•••••••••••••••••••••••••••

••••••••••••••••••••••••••

•••••••••••••••••••••••••••

••••••••••••••••••••••••••

•••••••••••••••••••••••••••

••••••••••••••••••••••••••

•••••••••••••••••••••••••••

2a

27

21

1a

22

32a

•

•

•

••

•••

••

5a

•

••

•••

•••

•••

•••

••

•••

••

••

••

••

••

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

•

••

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

•

••

••••

••

••••

••

••••

••

••••

••

••••

••

••••

••

••••

••

••••

••

••••

••

••

•

••••

••

••••

••

••••

••

••••

••

••••

••

••••

••

••••

••

••••

••

••••

••

••••

••

••••

••

••••

••

••••

••

••••

••

••••

••••

•••

••

7

14

11

74

12

TM00 4736 4094

Construction

MS Motors

Material specification for MS 4000

Standard Version

Pos. Component Material AISI

1 Stator Stainless steel 304

2 Rotor Stainless steel 431

3 Thrust bearing, (stationary) Carbon

4 Radial bearing, complete Ceramic

5 Bearing pipe, complete Cast iron GG20

6 Thrust bearing, (rotating) Ceramic

7 Clamping ring

10 Bearing retainer

11 Adjusting screw

12 Diaphragm NBR rubber

13 Motor end shield Stainless steel 304

15 Nut (special)

16 Lock washer

18/

Nut Stainless steel 316

21

20 Motor cable

22 Staybolt Stainless steel 316

22a Staybolt complete Stainless steel 316

24 O-ring

25 Shaft seal housing Stainless steel 304

27 Spline protector NBR rubber

28 Supporting ring for 27

29 Sand shield NBR rubber

30 Spring

31 Supporting ring

32 Seal ring, upper (stationary)

33 O-ring

34 Seal ring, lower (rotating) Tungsten carbide

70 Motor liquid SML-2

NBR rubber
Tungsten carbide

Example: MS 4000

22a

22

21

24

5

2

1

4

6

3

R-Version

Pos. Component Material AISI

1 Stator Stainless steel 904L

13 Motor end shield Stainless steel 904L

18/

Nut Stainless steel 904L

21

22 Staybolt Stainless steel 904L

22a Staybolt complete Stainless steel

25 Shaft seal housing Stainless steel 904L

RE-Version

Pos. Component Material AISI

12 Diaphragm FKM

27 Spline protector FKM

29 Sand shield FKM

32 Seal ring upper, (stationary) FKM ceramic

34 Seal ring lower, (rotating)

FKM
ceramic

904L

316

11

10

7

15

12

13

16

18

TM00 5068 4994

15

Construction

MS Motors

Material specification for MS 6000

Standard Version

Pos. Component Material AISI

1 Stator Stainless steel 304

2 Rotor

2a Stop ring PTFE

3 Thrust bearing, (stationary) Carbon

4 Radial bearing, lower

5 Radial bearing, upper

6 Thrust bearing (rotating)

7 Clamping flange Steel

10 Thrust cover Steel

11 Adjusting screw Steel

12 Diaphragm NBR rubber

13 Motor end shield Stainless steel 304

22 Bolt Stainless steel 904L

22a Priming screw Stainless steel 316

27 Sand shield NBR rubber

28 Retaining bolts Stainless steel

29 Shaft seal housing Stainless steel 304

30 Spring Stainless steel

Seal ring complete

32

(stationary)

33 O-ring

Seal ring complete

34

(rotating)

42 Stop for bearing Steel

46 Hex socket screw Stainless steel 304

46a Washer Nyltite

47 Screw Steel

49 Retaining spring Steel

50 Screw for motor cable Stainless steel 304

70 Motor liquid SML-2

R-Version

Pos. Component Material AISI

1 Stator Stainless steel 904L

13 Motor end shield Stainless steel 904L

22 Bolt Stainless steel 904L

22a Priming screw Stainless steel 904L

46 Hex socket screw Stainless steel 904L

50 Screw for motor cable Stainless steel 904L

RE-Version

Pos. Component Material AISI

12 Diaphargm FKM

27 Sand shield FKM

Seal ring complete

32

(stationary)

Ceramic/tungsten
carbide

Ceramic/tungsten
carbide

NBR
Ceramic

Tungsten carbide

FKM
Ceramic

Example: MS 6000

30

32

34

50

33

5

2a

2

1

42

11

10

7

12

27

22

29

22a

28

4

6

3

49

46a

46

47

13

TM03 0536 0205

16

Selection

MS Motors

Motor Operation

Most deep well submersible type pumps are powered
by electric motors. The optimum power unit used is
dependent on several physical and environmental
factors, which include the horsepower required for
pumping, the annual hours of operation and the avail­ability and cost of energy.

How does a motor "know" what horsepower to deliver?

Electric motors draw power in proportion to the applied
load. Although a motor is rated for a certain output
power (this is the number stamped on the nameplate),
that motor can deliver a wide range of power depending
on the voltage and frequency provided and the torque
demanded by the shaft load.

Power is the rate of energy use. Input power to a elec­trical motor is measured in kW, the motor converts that
electric power into mechanical power.

Output power is the product of speed (rpm) and torque
(ft.-lb.). For a given voltage and frequency combination,
the motor will always operate at a point on a specific
torque vs. speed curve.

The units of both output power and torque are generally
specified as a percentage of the motors full load rated
value on the manufactures performance curve.

A small change in speed produce large changes in
available torque near the normal (close to rated) oper­ating speed.

Thus as load torque increases, the rotational speed will
drop slightly (increased slip) as the motor load
increases.

As soon as voltage is supplied to the motor, the motor
“knows” the power to deliver by speeding up until it puts
out exactly the same torque as the load requires at that
speed.

At start-up, the motor produces torque higher than the
torque required by the driven load, accelerating the
pump shaft to full load speed.

A submersible pump is a centrifugal device which
exhibits variable torque load characteristics, it takes
very little torque to accelerate the load at low speed.

A centrifugal pump requires torque approximately
proportional to the square of its speed. The maximum
speed of a induction motor is a function of the number
of poles and line frequency.

Typical speeds associated with submersible motors,
based on the number of poles and a line frequency of
60 Hz are; 2p - 3600 rpm (sync.)/ 3450 rpm (@ full load)
and 4p - 1800 rpm (sync.)/ 1760 (@ full load).

The synchronous speed on any motor can be calcu­lated when the number of poles and operating
frequency is known, using the formula below:

N = f x 120/P where; N = sync. speed (rpm), P = poles, f = frequency (Hz)

Note: Actual induction motor speed at full load will be

2-5% less than the synchronous speed calculated using
the formula above.

A pump driven by two different motors of the same
nominal speed (rpm), but different Hp ratings, will draw
approximately the same power.

Under steady-state conditions the speed of operation
does not change significantly, unless the motor is too
small and stalls.

Motor Loading, Failure
and Lifetime

Motor load is commonly expressed as the percentage
of output power to rated output. Because output power
(load) is difficult to measure in the field, motor load is
usually estimated by measuring input power (kWI) and
assuming an efficiency.

It can also be estimated by measuring kVA and
assuming both power factor and efficiency. Failure of a
motor occurs when insulation breaks down from heat
and mechanical stresses.

The temperature of the windings are primarily depen­dent on the current (amps) draw through them and the
ability of motor to dissipate the heat generated to the
ambient environment. The higher the temperature, the
shorter the life. A 10°C(50F) rise can halve motor life.

Motor current draw increases with load; as a result,
motors that operate outside established load and
temperature ratings, will operate fewer hours before
failure.

The voltage supplied to the motor terminals have a
significant impact on motor life.

Motors are designed to operate at a utilization voltage
level or range, which is generally lower than the elec­trical system distribution voltage provided to the utility
meter. Motors can operate within a range of voltages;
but above a certain voltage, destructive arcing and
insulation deterioration can occur.

Conversely, as voltage drops, more current is needed
to maintain torque and power; so the motor runs hotter
and its life is shortened.

In addition to the overall voltage provided to the motor,
voltage unbalance must be considered. If the voltages
on the three phases to the motor are not well balanced,
one winding will carry more current and may over heat
and fail.

17

Selection

MS Motors

Most electrical utilities guarantees voltages to a +/-5
percent standard; for "480" service voltage will be
between 456 V and 504 V at the meter; for "240"
service, the voltages must be between 228 V and
252 V.

If a motor is damaged as a result of over or under
voltage outside the service limits, the utility may be
liable for damages.

Because motors will operate cooler with higher volt­ages, reasonable over voltage levels rarely causes
problems. There are only small variations in power
factor and efficiency near rated conditions, volt- amps
for a particular load can be assumed constant over the
range of voltage guarantee by the utility.

The maximum continuous load sustained by a motor is
indicated by the service factor. A motor with a service
factor of 1.15 can maintain a 115% overload; provided
voltages are at the rated level and well balanced and
the insulation system can be maintained at or below
rated temperature. The actual motor load percentage
can be calculated using the formula listed below:

EM IHp×

% Motor Load

where; Em = motor efficiency

IHp = Input Horsepower

Motor design and economic criteria have forced motor
manufactures to build less service factor (SF) into
motors.

The SF allows the motor to provide power under
optimal conditions at the nameplate rated power times
the SF. At rated conditions, (ie. 100 Hp motor with a SF
of 1.15 is designed to provide 115 HP under continuos
load).

A 1982 survey of motor manufacturers showed six of
seven respondents recommending loading at 100
percent of rated power or less while only one still
suggests loading up to SF rating.

For this reason, it is recommended that motor loading
not exceed 100% of the nameplate horsepower rating.
It is best to consider the SF as a contingency against
over loading as a result of low voltage, current imbal­ance and/or adverse ambient conditions.

------------------------- -

Rated HP

100× =

Motor Efficiency

An electric motor operates at a relatively constant effi­ciency and speed over a wide range of loadings.

Efficiency does not change significantly with age of the
motor or the load applied to it.

Motor efficiency is practically constant at motor loads
between 50 and 100%.

Reducing motor size for the sake of energy conserva­tion, as a result of efficiency increases associated with
loading the motor closer to full magnetic saturation
(100% load) is not recommended.

As a general rule, a bigger motor that is underloaded
(down to 50 percent) is more efficient than a fully
loaded smaller motor driving the same load. Submers­ible pump motors will have slightly lower efficiencies
than surface motor as a result of the compact design
requirements and the need for internal cooling/lubri­cating fluid.

Most submersible motors have an efficiency stamped
on the nameplate. The average or nominal efficiency
values associated with "canned/ hermetically sealed"
type submersible motors are listed in the Electrical Data
Section.

18

Selection

MS Motors

Application and Selection Issues

The term application not only refers to the end use of
the product but also the parameters which affect the
selection of the correct submersible motor and pump
products. The primary considerations involved with the
selection of submersible motors are discussed as
follows:

• The Insulation System. The insulation system is
the key to long motor life. The life of the insulation
system is affected by three major factors: Load,
Duty Cycle, and Temperature Rise. The load of a
motor is described in horsepower or kilowatts and is
defined as the work required to perform a function.
The load created by pumps is a result of the rotation
of impeller(s) to create a pressure forcing fluid
through a system. The duty cycle is the time period,
which the motor is operating. It is continuous or in­termittent. Temperature rise is the difference be­tween the operating temperature of the windings
and the temperature of the medium to cool the mo­tor. The rise of the motor is directly affected by the
load and duty cycle. Extra load in the form of a ser­vice factor increases the temperature rise of the
winding.

The total temperature must never exceed the maximum
capacity of the insulation system. Submersible motors
used for water well service normally employ class “F”
insulation (150°F rise), but are designed for a class A
temperature rise (60°F).

• Cooling. Submersible motors are no different than
conventional motors, in that the heat generated
within the motor must be dissipated. The tempera­ture rise within the motor is limited to a value which
when added to the temperature of the external cool­ing medium does not exceed the maximum temper­ature capacity of the insulation system. The ability
to dissipate the heat depends on two factors: (1)
The temperature of the cooling medium (ambient)
and (2) the rate of cooling medium flow past the mo­tor external surfaces. Excess ambient temperature
and reduced flow rate both require derating of the
load capability of the unit. The derating of the load
reduces the temperature rise of the winding within
the limits set by the heat dissipation capacity of the
cooling medium.

• Materials of Construction. Submersible pumps

and motors are also selected based on the chemical
and physical make-up of the water in which they will
be submerged. Sea water applications require spe­cialized construction due to the corrosive water en­countered. A standard motor will not survive highly
corrosive water submergence, while a specially de­signed motor will.

• Design Factors. Other factors, which affect sub-

mersible motor selection, are voltage, depth of in­stallation, thrust and controls. It is necessary that
the voltage and frequency variations be within the
limits set in NEMA MGI-18 (submersible motors for
deep well pumps). The maximum recommended
depth for most submersible motors relates to 290
psi on the unit (approx. 2000 feet). The thrust deliv­ered by the pump must be less than the capacity of
the thrust bearing of the submersible motor. Con­trols must be quick trip, ambient compensated type
to quickly pull an improperly applied or defective
motor off the line so that no damage occurs.

Submersible construction and design for 4"and 6" sizes
are covered by NEMA standards.

19

Mechanical Installation

MS Motors

Submersible Motor Cooling

The key to long submersible motor life is good cooling.
Most submersible pumps rely on moving heat away
from the motor by forced convection. The ambient/
produced fluid is typically drawn by the motor in the
course of pumping to accomplish this task. Grundfos
Submersible Motors are designed to operate at full load
in water up to 30°C (86°F) free convection, and 40C
(104F) provided the flow velocity can be maintained at
a minimum of 0.25 feet per second (fps).

Required Cooling Flow
and Velocity

AWWA specifications state the maximum motor diam­eter and the minimum inside diameter of the well shall
be in such relationship that under any operating condi­tion the water velocity past the motor shall not exceed
12 fps (3.7 m/s) nor be less than 0.5 fps (0.15 m/s). The
AWWA specifications are principally applicable to
motors 6-inch and larger, as most 4-inch motor designs
are based on a minimum cooling flow velocity of 0.25
fps (0.08 m/s) at rated ambient temperature. Table 1
relates flow, casing and motor size requirements to
accomplish minimum cooling velocity.

(Table 1) Minimum Submersible Cooling Flow
Requirements

Casing/Sleeve

I.D. (inches)

41.2-

57.0-

6139

72025

83045

10 50 90

12 80 140

14 110 200

16 150 280

18 - 380

Note: At the velocity specified in the table the temperature differential
between the motor surface and ambient water will range from 5° - 15°C
(10-30°F).

Grundfos Submersible Motors require no cooling fluid
flow past the motor, when the produced fluid tempera­ture is 30°C (86°F) or less. Cooling by free convection
in such cases, is contingent on no adverse operating
conditions present such as; poor power, high stop/start
frequency, presence of incrustating deposits on the
motor surface, etc. Detramental operating conditions
are difficult to identify or predict, and for this reason, the
minimum cooling flow should be provided whenever
possible - regardless of the ambient fluid temperature.

4" Motor

(0.25 fps)

6" Motor

(0.5 fps)

Water Temperature and Motor
Derating

As previously stated, the full motor capacity is a func­tion of ambient fluid temperature and flow past the
motor.

When the ambient temperature exceeds the tempera­ture at which the motor performance is based, the
motor must be derated and/or cooling velocity
increased. Table 2 provides typical derating criteria for
hermetically sealed/canned type submersible motors.
Such motors should not be used in applications which
exceed 60°C (140°F) regardless of any special provi­sions incorporated into the system. AWWA specifica­tions state that the motor temperature shall not exceed
the allowable operating temperature of the motor thrust
and radial bearings, and in no case shall it exceed the
temperature rating of the motor insulation system.

When the service duty exceeds 40°C (104°F) pumps
and motors fitted with NBR rubber components are
subject to reduced life if not replaced on a regular basis.
A minimum replacement interval of three years is
recommended.

FKM elastomers (rubber compounds) are recom­mended any time the normal ambient fluid temperature
exceeds 104°F. Allowable % Max. Namplate Amps
Derated for Ambient Water Temp. @ .5 fps

(Table 2) Allowable % Max Nameplate Amps

Derated. for Ambient Water Temp at .50fps.

Water Temp. 0 - 3 Hp 5 - 15 Hp 20 - 40 Hp

30°C (86°F) 100% 100% 100%

35°C (95°F) 100% 100% 90%

40°C (104°F) 100% 90% 80%

45°C (113°F) 90% 80% 70%

50°C (122°F) 80% 70% 60%

55°C (130°F) 70% 60% 45%

60°C (140°F) 50% - -

Note: Derating % is based on an ambient fluid temperature of 30°C
(86°F) @ 0.5 fps, consult motor manufacture for specific maximum full­load cooling water temperature without derating. Typical base abient fluid
temperature rating for various manufactures of submersible motors used
in the water supply industry range from 25°C to 40°C, with 30°C being
the most prominent.

20

Mechanical Installation

MS Motors

Shroud/Flow Inducer Sleeve/
Cooling Sleeve

On some installations it is necessary to use a shroud to
insure that all, or some portion of the produced fluid
pass by the motor in order to carry away the heat gener­ated.

In some cases, the shroud is used to increase velocity
(create turbulent flow) in order to prevent the formation
of deposit and inhibit corrosion.

A shroudshould be used/ considered under the
following operating scenarios:

1. Top-feeding (cascading) wells can feed the water di­rectly into the pump without its flowing past the mo­tor if the well is not cased to below the motor, or
casing is perforated above the motor.

2. Flow may be inadequate when the motor is in a
large body of water or a casing much larger than the
motor, or if delivery is very low, or in sump/wet pit
tank applications.

3. If the groundwater is aggressive or contains
chloride, the corrosion rate will double for every
15°C (56F) increase in temperature between the
motor metallic housing and water. The motor hous­ing is generally 5-15°C (41-56F)warmer than the
produced water. A cooling sleeve will therefore re­duce the risk of motor corrosion by keeping the ex­terior motor surface temperature lower during
operation.

4. If the well water contains a significant amount of
iron (iron bacteria), manganese and calcium. These
substances will be oxidized and deposited on the
motor surface. In case of low flow past the motor,
incrustation build-up forms a heat insulating layer of
oxidized minerals, which may result in hot spots in
the motor winding insulation. This temperature in­crease may reach values, that impare the insulating
system, and consequently the motor life.

A cooling sleeve will insure turbulent flow past the
motor prohibiting incrustation build-up and optimize
cooling.

A cooling sleeve/shroud should be selected so as to
keep the maximum fluid velocity past the motor to 15
fps (12 fps by AWWA specs.).

At the higher velocities, erosion can be significantly
accelerated in the presence of abrasives and increase
intake losses can impare pump performance.

Head loss for various motor O.D. and casing/shroud
I.D. combinations are listed in Table 3, and should be
considered under marginal submergence and suction
conditions.

A fluid velocity of 3 fps is generally considered optimum
and 0.5 fps is the minimum cooling velocity value.

The actual fluid velocity past the motor can be calcu­lated using the formula:

Velocity (past motor) = gpm/2.45 (ID casting)2 - (OD motor)2.

where; Casing or shroud ID and motor OD values are in
inches, and velocity(past the motor is in fps.

(Table 3) Annular Space Head Loss (Hf) from Flow
Past Motor (ft. of Water)

Motor

(nominal)

Casing I.D. 4.25" 5" 6" 6" 7" 8"

100 4.7 0.3 1.7

150 10.2 0.6 0.2 3.7

200 1.1 0.4 6.3 0.5

gpm

250 1.8 0.7 9.6 0.8

300 2.5 1.0 13.6 1.2 0.2

400 23.7 2.0 0.4

500 3.1 0.7

600 4.4 1.0

Note: The tabulated friction loss values assume maximum motor length
for the specified nominal motor size and a smooth casing/sleeve ID, and
include entry and exit losses.

4" 4" 4" 6" 6" 6"

25 0.3

50 1.2

Typical cooling sleeve/shroud configurations. The
motor shroud is generally of the next nominal diameter
of standard pipe larger than the motor or the pump,
depending on the shroud configuration used. The
tubular/pipe material can be plastic or thin walled steel
(corrosion resistant materials preferred). The cap/top
must accommodate power cable without damage and
provide a snug fit, so that only a very small amount of
fluid can be pulled through the top of the shroud. The fit
should not be completely water tight as ventilation is
often required to allow escape of the air or gas that
might accumulate. The shroud body should be stabi­lized to prevent rotation and maintain the motor
centered within the shroud. The shroud length should
extend to a length of 1-2 times the shroud diameter
beyond the bottom of the motor when possible.
Shrouds are typically attached immediately above the
pump intake or at the pump/column correction.

A typical motor sleeve/shroud selection example is
sited below and illustrated in Figure 5:

21

Mechanical Installation

Example 1:

A six-inch motor and pump that delivers 60 gpm will be
installed in a 10” well, 90 gpm past the motor is required
assuming 10” ID well (from Table 1). An 8” or smaller
sleeve must be added to the pump to provide a cooling
flow velocity of 0.5 fps or greater.

Typical Motor Jacket Installation Scenarios

Typical Flow Inducer Sleeve Cutaway View

MS Motors

If a well feeds water from above the pump, has a
casing/chamber too small to allow a motor jacket/
sleeve on the pump, and does not have adequate level
and flow to allow raising the pump above the inflow, it
is difficult to properly cool the motor. When possible,
the casing depth should be increased to allow flow to
come from below the motor. If this is not practical,
adequate flow past the motor can usually be attained by
employing a motor jacket with a stringer pipe or by
using a jet tube as shown in Figure 6.

Fig. 6 Motor Jacket Installation

The table shows the recommended number of starts of intermittent operation:

Special (Non Water Well) Applica­tions

A cooling shroud should be used in all static horizontal
and vertical installations where water can directly enter
the pump intake, without crossing the motor surface. In
addition to focusing the pumped fluid to dissipate motor
heat, a motor shroud can be used to improve suction
conditions by reducing vortices. Such applications
include fountains and pump-out tanks, where the
ambient fluid temperature is often higher than ground­water temperatures.

22

In such installations; motor submergence-temperature
considerations, as well as pump intake requirement
must be carefully considered.

Intermittent Operation

Motor type Recommended number of starts

MS 402 - 4" Min. 1 pr. year

MS 4000 - 4" Max. 100 pr. hour

MS 6000 - 6" Max. 300 pr. day

A typical horizontal pump out tank application is illus­trated in Figure 7. Vertical application should be
handled as illustrated in Figure 8, which is analogues to
top feeding water well application.

Mechanical Installation

Cooling Sleeve - Horizontally Installed Motor in a
Tank

Water level

Min. 1.5 ft

W/O Cooling Shroud

Baffle Plate

MS Motors

Cooling Sleeve - Vertically Insulated Motor in Tank

Seen from above

Water level

Baffle Plate

Min. 1.5 ft

W Cooling Shroud

Fig. 7 Horizontal Installation

Vortex

TM03 0561 0205

Fig. 8 Vert ical Flow

Cross section

Vortex

TM03 0559 0205 - TM03 0560 0205

23

Electrical Installation

MS Motors

Submersible Power Cable

Power is transmitted from the starter/controller to the
submersible motor through a marine duty power cable,
typically consisting of three flexible stranded conduc­tors of the proper size to carry the motor full load
amperes (FLA) at its rated voltage. AWWA standards
require a separate ground wire to be provided (ie. 3­wire cable systems are equipped with three power
conductors and a ground wire of the same size).

Proper cable selection is a function of motor load,
voltage, available space, length (setting depth) and
environment.

(Table 4) Typical Submersible Power Cable Physical Data

600 Volt (115, 208, 230, 460 and 575 Volt Motors) 5000 Volt (2300 Volt Motors)

Type I Type II Type III Type IV

3 Conductors and ground in a
Common Jacket (4 wire total)

Cable Size

3 Conductors and ground in Sep-

arate Jackets (4 wire total)

Typical conductor insulation materials are synthetic
rubber (RW, RUW, TW, etc.), plastic (PVC, XPLE, etc.)
or special polymer (FPE, hypalin, EPR - EPDM, etc.).
Special cable insulations are often recommended or
required for sever duty or special applications such as;
gas, hydro - carbon, heat, variable frequency, etc.

Cable can be provided as three or more separate indi­vidual or, twisted conductors, molded side by side in a
flat cable configuration or three conductors with a round
common jacket. Refer to Table 4 for general submers­ible power cable physical data (weight and diameter).
Armored cable is also available for special applications,
but is typically not employed in the water supply
industry. Cable is supported and attached to column/
drop pipe by means of cable clamps, tape or bands.
One extra foot of cable for each fifty feet of length
should be allowed plus an additional ten to fifty feet for
surface connections.

3 Conductors in a Common

Jacket (3 wire total)

3 Conductors in Separate

Jackets (3 wire total)

AWG
MCM

14 .39 .16 .19 .10

12 .43 .20 .21 .13

10 .64 .32 .27 .18

8 .76 .44 .31 .29 1.02 .69 .39 .43

6 .91 .65 .36 .43 1.10 .85 .43 .52

4 1.02 .90 .42 .64 1.21 1.12 .47 .71

2 1.15 1.26 .48 .97 1.33 1.46 .53 .99

11.341.68.581.26----

0 1.43 2.0 .62 1.54 1.51 2.09 .62 1.49

00 1.53 2.41 .67 1.91 1.61 2.56 .66 1.87

0001.642.89.722.36----

0000 1.80 3.58 .78 2.93 1.82 3.40 - -

2501.975.88.904.82----

3002.096.60.955.62----

350 2.20 7.34 1.00 6.50 2.51 4.8 - -

4002.348.181.057.25----

5002.259.301.138.87----

1. Types I and II cables are typically insulated and jacketed with synthetic rubber, PVC or XLPE.

2. Types II and IV are often supplied paralleled in a flat cable configuration, or in a twisted configuration for smaller sizes.

Type I and II cable include 3 power conductors and a ground conductor.

3. AWWA minimum stranding and insulation requirements; No. 10 and smaller - 7 strand/ Class B, No. 9 through No. 2 - 19 strand/ Class C, No. 1

through 4/0 - 19 strand/ Class B. Minimum conductor area to meet minimum ICEA (Insulated Cable Engineers Association) code for operation in free air.

4. Verity actual cable weight per foot with manufacture for greater accuracy, as weight and diameter will very with insulation system and manufacture.

O.D. (in) Wt. (lbs./ft.)

O.D. (in)

per Cable

Wt. (lbs./ft.)

for 4 Cables

O.D. (in) Wt. (lbs./ft.)

O.D. (in)

per Cable

Wt. (lbs./ft.)

for 3 Cables

24

Electrical Installation

MS Motors

Cable Selection

Maximum cable lengths are generally calculated to
maintain 95% of service entrance voltage at the motor
running at maximum nameplate amps, and to maintain
adequate starting torque. Calculations take into
account basic cable resistance, reactance, power
factor and temperature rise cable larger than specified
may always be used, and will reduce power consump­tion. The wire sizing chart in the Electrical Data section
tabulates copper cable sizes for various cable lengths
vs motor size. The use of power cables smaller than the
minimum sizes as permitted by code or recommended
by Grundfos will generally void the motor warranty.
Understized cable sizes will cause reduced starting
torque and poor motor operation.

Mixed Cable

In a submersible pump installation any combination of
cables sizes may be used provided they do not exceed
the individual maximum conductor ampacity limit and
the aggregate voltage drop does not exceed 5% of the
motor nameplate voltage while operating at full load.
Mixed cable sizes are most often encountered when a
pump is being replaced with a larger horsepower unit.

Cable Splice

When the downhole power cable (drop cable) must be
spliced or connected to the motor leads, it is necessary
that the splice be water tight. Under normal service
conditions, the splice can be made using commercially
available potting compounds, heat shrink or tape. Each
type of splicing methods is affective when made by
competent personnel, potted or head shrink splices are
recommended when submergence pressures exceeds
25 psi (60’). A cable splice should exhibit a minimum
insulation resistance of 10 megohms, measured in a
submerged state after 24 hours in water. A typical low
voltage (< 600V) tape splice is illustrated below in
Figure 9.

When three conductors are encased in a single outer
shealth, tape individual conductors as described, stag­gering joints. Total thickness of tape should be no less
than the thickness of the conductor insulation.

Motor Lead

Most manufactures will provide a factory motor lead
assembly, pre-potted and designed to provide a water
tight connection between it and the motor terminals.
Typical motor lead length range from 48" to 150" and
are generally spliced to the drop cable immediately
above the pump. Minimum wire sizes (AWG) for factory
provided motor lead assemblies, by nominal motor size
are; 4" - #14 to #12, 6" - #10 to #8, 8" - #4 and 10" - #2.

In general, a motor lead assembly should not be reused
as rubber compounds typically used in there construc­tion will set with time, making a water tight connection
difficult. Grundfos installation instructions, which
includes pot head connecting torque values and lubri­cation requirements, should be strictly observed.

STAKED CONNECTOR

2"

2"

Fig. 9 Tape Splice

2"

RUBBER TAPE

PVC ELECTRICAL TAPE

2"

TM03 0564 0205

25

Technical Data

Outline Drawing MS 402

3.74

MS Motors

3.0

1.48

.14

3.43

.90

A

1.50 +.005/-.003

Dimensions and Weights MS 402

Output

Standard motors

[HP] P2 [kW]

P

2

.33 .25 1 60 10.2 14.9 17.4 .0953

.50 .37 1 60 11.0 14.9 17.4 .1017

.75 .55 1 50/60 11.6 18.0 19.8 .1062

1.0 .75 1 50/60 12.2 19.6 22.9 .1112

1.5 1.1 1 50/60 13.7 23.1 26.4 .1239

2.0 1.5 1 50/60 13.7 24.2 27.6 .1239

.50 .37 3 50/60 9.0 12.1 14.3 .0858

.75 .55 3 50/60 9.6 13.8 16.1 .0904

1.0 .75 3 50/60 11.0 18.0 19.4 .1017

1.5 1.1 3 50/60 12.2 19.6 22.9 .1112

2.0 1.5 3 50/60 13.7 23.1 26.4 .1239

3.0 2.2 3 50/60 13.7 24.2 29.5 .1239

Phases

Frequency

[Hz]

A-Dimension

[in]

Net Weight

[lbs]

Gross Weight

[lbs]

Shipping

Vol ume 

3

]

[f

TM03 0645 0405

26

Technical Data

Outline Drawing MS 4000

3.74

MS Motors

3.0

1.57

3.43

.866

A

1.50 +.005/-.003

Dimensions and Weights MS 4000

Output

Standard motors

[HP] P2 [kW]

P

2

2 1.5 1 50/60 19.5 37.2 39.5 .4415

3 2.2 1 50/60 22.6 44.3 47.5 .4415

5 3.7 1 50/60 26.6 56.2 58.5 .4415

3.0 2.2 3 50/60 18.0 35.2 37.5 .4415

5.0 3.7 3 50/60 22.7 46.2 48.5 .4415

7.5 5.5 3 50/60 26.6 57.3 59.5 .4415

10 7.5 3 50/60 30.6 68.3 70.5 .4415

Phases

Frequency

[Hz]

A-Dimension

[in]

Net Weight

[lbs]

Gross Weight

[lbs]

Shipping

Vol ume 

3

]

[f

TM03 0646 0405

27

Technical Data

Outline Drawing MS 6000

5.43

MS Motors

4.37

A

2.87 +0.0/-.15

Dimensions and Weights MS 6000

Output

Standard motors

[HP] P2 kWp]

P

2

7.5 5.5 3 50/60 21.4 73.8 80.4 1.412

10 7.5 3 50/60 22.6 81.5 88.2 1.412

15 11.0 3 50/60 25.0 100.3 109.1 1.871

20 15.0 3 50/60 27.5 115.7 124.5 1.871

25 18.5 3 50/60 29.7 127.8 136.6 1.871

30 22.0 3 50/60 32.0 141.0 149.9 1.871

40 30.0 3 50/60 37.2 170.8 179.6 1.871

Phases

Frequency

[Hz]

A-Dimension

[in]

Net Weight

[lbs]

Gross Weight

[klbs]

Shipping

Vol ume 

3

]

[f

TM03 0644 0405

28

Electrical Data

MS Motors

Grundfos Motors Specifications

1- Phase Motors

HP Ph Volt

4-Inch, Single Phase, 2-Wire Motors (control box not required)

1/3 1 230 4.6 25.7 59 77 900 6.8-8.2 S 79952101

1/2 1 115 12.0 55 62 76 900 1.1-1.3 R 79922102

1/2 1 230 6.0 34.5 62 76 900 5.2-6.3 R 79952102

3/4 1 230 8.4 40.5 62 75 900 3.2-3.8 N 79952103

1 1 230 9.8 48.4 63 82 900 2.5-3.1 M 79952104

1 1/2 1 230 13.1 62 64 85 900 1.9-2.3 L 79952105

4-Inch, Single Phase, 3-Wire Motors

1/3 1 115 9.0 29 59 77 900 1.55-1.9 2.4-3 M 79423101

1/3 1 230 4.6 14 59 77 900 6.8-8.3 17.3-21.1 L 79453101

1/2 1 115 12.0 42.5 61 76 900 0.9-1.1 1.9-2.35 L 79423102

1/2 1 230 6.0 21.5 62 76 900 4.7-5.7 15.8-19.6 L 79453102

3/4 1 230 8.4 31.4 62 75 900 3.2-3.9 14-17.2 L 79453103

1 1 230 9.8 37 63 82 900 2.6-3.1 10.3-12.5 K 79453104

1.5 1 230 11.6 45.9 69 89 900 1.9-2.3 7.8-9.6 H 79453105

2 1 230 13.2 57 72 86 1500 1.5-1.8 3.4-4.1 G 79454506

3 1 230 17.0 77 74 93 1500 1.2-1.4 2.45-3 F 79454507

5 1 230 27.5 110 77 92 1500 0.65-0.85 2.1-2.6 F 79454509

Amperage Full Load

Max Start Eff. (%) Pwr Fact. Blk-Yel Red-Yel

Max.

Thrust

(lbs)

Line-to-Line

Resistance (Ω)

KVA Code



Nameplate

No.

3-Phase Motors

HP Ph Volt

4-Inch, Three Phase, 3-Wire Motors

230 7.3 40.3 75 72 900 3.9 K 79302005

1 1/2 3

23

33

53

7 1/2 3

10 3

460 3.7 20.1 75 72 900 15.9 K 79362005

575 2.9 16.1 75 72 900 25.2 K 79392005

230 8.7 48 76 75 900 3.0 J 79302006

460 4.4 24 76 75 900 12.1 J 79362006

575 3.5 19.2 76 75 900 18.8 J 79392006

230 12.2 56 77 75 900 2.2 H 79302006

460 6.1 28 77 75 900 9.0 H 79362007

575 4.8 22 77 75 900 13.0 H 79395507

230 19.8 108 80 82 1500 1.2 H 79304509

460 9.9 54 80 82 1500 5.0 H 79354509

575 7.9 54 80 82 1500 7.3 H 79394509

230 25.0 130 81 82 1500 0.84 H 79305511

460 12.8 67 81 82 1500 3.24 J 79355511

575 10.6 53 81 82 1500 5.2 J 79395511

460 18.0 90 81 80 1500 1.16 H 79355512

575 14.4 72 81 80 1500 1.84 H 79395512

Amperage Full Load

Max Start. Eff. (%) Pwr fact. Blk-Yel Red-Yel

Max.

Thrust

(lbs)

Line-to-Line

Resistance (Ω)

KVA Code



Nameplate

No.

29

Electrical Data

MS Motors

HP Ph Volt

6-Inch, Three Phase, 3-Wire Motors

230 26.4 119 80.5 76 1500 0.63 H 78305511

7 1/2 3

10 3

15 3

20 3

25 3

30 3

40 3 460 64.0 320 64.0 82 7000 0.39 H 78355520

460 13.2 59 80.5 76 1500 2.4 G 78355511

575 10.6 48 80.5 76 1500 4.07 H 78395511

230 34.0 156 82.5 79 1500 0.41 G 78305512

460 17.0 78 82 79 1500 1.8 G 78355512

575 13.6 63 82 79 1500 3.1 G 78395512

230 49.0 230 82.5 82 7000 0.25 G 78305514

460 24.5 115 82.5 82 7000 1.16 F 78355514

575 19.6 92 82.5 82 7000 1.9 G 78395514

230 66.0 343 84 81 7000 0.20 H 78305516

460 33.0 172 84 82 7000 0.80 H 78355516

575 26.4 137 84 82 7000 1.32 H 78395516

460 41.0 217 84.5 80 7000 0.62 H 78355517

575 33.0 175 84.5 80 7000 1.04 H 78395517

460 46.5 237 85 83 7000 0.55 G 78355518

575 37.0 189 84.5 83 7000 0.92 G 78395518

Amperage Full Load

Max Start Eff. (%) Pwr Fact. Blk-Yel Red-Yel

Max.

Thrust

(lbs)

Line-to-Line

Resistance (Ω)

KVA Code



Nameplate

No.

30

Electrical Data

Transformer Capacity

Required for Three-Phase Motors

Submersible Smallest KVA Rating - Each Transformer

Three-Phase

Motor HP Rating

1.5 3 21

24 21.5

35 32

57.5 53

7.5 10 7.5 5

10 15 10 5

15 20 15 7.5

20 25 15 10

25 30 20 10

30 40 25 15

40 50 30 20

50 60 35 20

60 75 40 25

75 90 50 30

100 120 65 40

125 150 85 50

150 175 100 60

175 200 115 70

200 230 130 75

 Pump Motor KVA requirements only - does not include allowances for other loads.

 This is also the KVA required for single phase motors.

Total Effective

KVA Required

Open WYE or DELTA

2 Transformers

MS Motors

WYE or DELTA
3 Transformers

31

Electrical Data

Engine-Driven Generators

Required for Submersible Motors

Sub Motor HP

Single or Three Phase

1/3 Hp 1.5 1.0 1.2 1.5

1/2 Hp 2.0 2.5 1.5 1.9

3/4 Hp 3.0 3.8 2.0 2.5

1 Hp 4.0 5.0 2.5 3.13

1 1/2 Hp 5.0 6.25 3.0 3.8

2 Hp 7.5 9.4 4.0 5.0

3 Hp 10.0 12.5 5.0 6.25

5 Hp 15.0 18.75 7.5 9.4

7 1/2 Hp 20.0 25.0 10.0 12.5

10 Hp 30.0 37.5 15.0 18.75

15 Hp 40.0 50.0 20.0 25.0

20 Hp 60.0 75.0 25.0 31.0

25 Hp 75.0 94.0 30.0 37.5

30 Hp 100.0 125.0 40.0 50.0

40 Hp 100.0 125.0 50.0 62.5

50 Hp 150.0 188.0 60.0 75.0

60 Hp 175.0 220.0 75.0 94.0

75 Hp 250.0 313.0 100.0 125.0

100 Hp 300.0 375.0 150.0 188.0

125 Hp 375.0 469.0 175.0 219.0

150 Hp 450.0 563.0 200.0 250.0

175 Hp 525.0 656.0 250.0 313.0

200 Hp 600.0 750.0 275.0 344.0

1. Figures shown are based on typical 80°C rise continuous duty generators with 35% maximum voltage dip during start-up of single-phase

and three-phase motors.

2. Contact the manufacturer of the generator to assure the unit has adequate capacity to run the submersible motor.

Externally

kW

Minimum kW Rating of Generator

Regulated

KVA

Internally

kW

MS Motors

Regulated

KVA

32

Electrical Data

Motor Protection Chart

1- Phase Motors

HP Ph Volt

4-Inch, Single Phase, 2-Wire Motors (control box not required)

1/3 1 230 15 5 - - 79952101

1/2 1 115 30 15 - - 79922102

1/2 1 230 15 7 - - 79952102

3/4 1 230 20 9 - - 79952103

1 1 230 25 12 - - 79952104

1 1/2 1 230 35 15 - - 79952105

4-Inch, Single Phase, 3-Wire Motors

1/3 1 115 25 10 - - 79423101

1/3 1 230 15 5 - - 79453101

1/2 1 115 30 15 - - 79423102

1/2 1 230 15 7 - - 79453102

3/4 1 230 20 9 - - 79453103

1 1 230 25 12 - - 79453104

1.5 1 230 30 15 - - 79453105

2 1 230 30 15 - - 79454506

3 1 230 45 20 - - 79454507

5 1 230 70 30 - - 79454509

Circ. Brkr or Fuses Three Phase Overload Protection

Std. Delay Starter size

Furnas Amb.

Comp

MS Motors

Nameplate

3-Phase Motors

HP Ph Volt

4-Inch, Three Phase, 3-Wire Motors

1 1/2 3

23

33

53

7 1/2 3

10 3

Circ. Brkr or Fuses Three Phase Overload Protection

Std. Delay Starter size

230 15 8 0 K41 79302005

460 10 4 0 K32 79362005

575 10 4 0 K28 79392005

230 20 10 0 K50 79302006

460 10 5 0 K34 79362006

575 10 4 0 K31 79392006

230 30 15 0 K54 79302006

460 15 7 0 K37 79362007

575 15 6 0 K36 79395507

230 40 25 1 K61 79304509

460 20 12 0 K50 79354509

575 15 9 0 K43 79394509

230 60 30 1 K67 79305511

460 35 15 1 K56 79355511

575 30 15 1 K53 79395511

460 50 25 1 K61 79355512

575 40 20 1 K58 79395512

Furnas Amb.

Comp

Nameplate

33

Electrical Data

MS Motors

HP Ph Volt

6-Inch, Three Phase, 3-Wire Motors

230 60 35 1 K67 78305511

7 1/2 3

10 3

15 3

20 3

25 3

30 3

40 3 460 150 80 3 K78 78355520

460 30 15 1 K56 78355511

575 25 12 1 K53 78395511

230 80 45 1 3/4 K70 78305512

460 40 20 1 K60 78355512

575 35 15 1 K57 78395512

230 125 60 2 1/2 k76 78305514

460 60 30 1 3/4 K67 78355514

575 50 25 1 3/4 k62 78395514

230 150 80 3 k79 78305516

460 80 40 2 k68 78355516

575 70 30 2 k67 78395516

460 100 50 2 K73 78355517

575 80 40 2 K70 78395517

460 110 60 2 1/2 K76 78355518

575 100 40 2 1/2 K72 78395518

Circ. Brkr or Fuses Three Phase Overload Protection

Std. Delay Starter size

Furnas Amb.

Comp

Nameplate

34

Electrical Data

MS Motors

Motor Cable Selection Chart
(Motor Service to Entrance)

Single Phase, 60 Hz

Motor Rating Copper Wire Size

VoltsHP14121086420000000000 250 300

115

230

1/3 130 210 340 540 840 1300 1960 2910 - - - - -

1/2 100 160 250 390 620 960 1460 2160 - - - - -

1/3 550 880 1390 2190 3400 5250 7960 ------

1/2 400 650 1020 1610 2510 3880 5880 ------

3/4 300 480 760 1200 1870 2890 4370 6470 - - - - -

1 250 400 630 990 1540 2380 3610 5360 6520 - - - -

1 1/2 190 310 480 770 1200 1870 2850 4280 5240 - - - -

2 150 250 390 620 970 1530 2360 3620 4480 - - -

3 120 190 300 470 750 1190 1850 2890 3610 - - - -

5 - - 180 280 450 710 1110 1740 2170 - - - -

7 1/2 - - - 200 310 490 750 1140 1410 - - - -

10 - - - - 250 390 600 930 1160 - - - -

Three Phase, 60 Hz

Motor Rating Copper Wire Size

VoltsHP14121086420000000000 250 300

1 1/23105007901260---------

2 240 390 610 970 1520 - - ------

3 180 290 470 740 1160 1810 - ------

5 - 170 280 440 690 1080 1660 ------

208

230

7 1/2 - - 200 310 490 770 1180 1770 - - - - -

10 - - - 230 370 570 880 1330 1640 - - - -

15 - - - - 250 390 600 910 1110 1340 - - -

20 - - - - - 300 460 700 860 1050 1270 - -

25 - - - - - - 370 570 700 840 1030 1170 -

30 - - - - - - 310 470 580 700 850 970 1110

1 1/23605809201450---------

2 280 450 700 1110 1740 - - ------

3 210 340 540 860 1340 2080 - ------

5 - 200 320 510 800 1240 1900 ------

7 1/2 - - 230 360 570 890 1350 2030 - - - - -

10 - - - 270 420 660 1010 1520 1870 - - - -

15 - - - - 290 450 690 1040 180 1540 - - -

20 - - - - - 350 530 810 990 1200 1450 - -

25 - - - - - 280 430 650 800 970 1170 1340 -

30 - - - - - - 350 540 660 800 970 1110 1270

35

Electrical Data

Motor Rating Copper Wire Size

VoltsHP14121086420000000000 250 300

1 1/2 1700 - - ----------

2 1300 2070 - ----------

3 1000 1600 2520 ----------

5 590 950 1500 2360 - - - ------

7 1/2 420 680 1070 1690 2640 - - ------

10 310 500 790 1250 1960 3050 - ------

15 - - 540 850 1340 2090 3200 ------

20 - - 410 650 1030 1610 2470 3730 - - - - -

25 - - - 530 830 1300 1990 3010 3700 - - - -

460

575

1. If aluminum conductor is used, multiply lengths by 0.5. Maximum allowable length of aluminum is considerably shorter than copper wire of same size.

2. The portion of the total cable which is between the service entrance and a 3ø motor starter should not exceed 25% of the total maximum length to assure

reliable starter operation. Single-Phase control boxes may be connected at any point of the total cable length.

3. Cables #14 to #0000 are AWG sizes, and 250 to 300 are MCM sizes.

30 - - - 430 680 1070 1640 2490 3060 3700 - - -

40 - - - - - 790 1210 1830 2250 2710 3290 - -

50 - - - - - 640 980 1480 1810 2190 2650 3010 -

60 - - - - - - 830 1250 1540 1850 2240 2540 2890

75-------10301260 1520 1850 2100 2400

100--------94011301380 1560 1790

125----------1080 1220 1390

150-----------10501190

200-----------10801300

250------------1080

1 1/2 2620 - - ----------

2 2030 - - ----------

3 1580 2530 - ----------

5 920 1480 2330 ----------

7 1/2 660 1060 1680 2650 - - - ------

10 490 780 1240 1950 - - - ------

15 - 530 850 1340 2090 - - ------

20 - - 650 1030 1610 2520 - ------

25 - - 520 830 1300 2030 3110 ------

30 - - - 680 1070 1670 2560 3880 - - - - -

40 - - - - 790 1240 1900 2860 3510 - - - -

50 - - - - - 1000 1540 2310 2840 3420 - - -

60 - - - - - 850 1300 1960 2400 2890 3500 - -

75 - - - - - - 1060 1600 1970 2380 2890 3290 -

100-------11901460 1770 2150 2440 2790

MS Motors

36

Accessories

CU 3

The CU 3 control unit is an electronic motor starter for
monitoring and protecting installations with rated volt­ages of 200-575 V, 50 - 60 Hz, and a maximum power
consumption of 400 A.

The CU 3 monitors the following parameters:

• System insulation resistance to earth before start.

• Motor temperature.

• Motor current consumption and current unbalance.

• Voltage supply.

• Phase sequence.

The CU 3 protects against:

• Dry running (not for certain MS 402 motors).

• Incipient motor defect

• Too high motor temperature (not for certain MS 402
motors).

• Motor burnout.

As standard, the CU 3 incorporates:

• Time relay for star-delta starting and autotrans­former starting.

• Relay output for external fault indication.

In addition CU 3 can be expanded to offer the following
functions:

• Remote control R100: Wireless infra-red remote
control by means of the R100. This function enables
the user to change factory settings and to monitor
the installation by calling up actual operating data,
e.g. current consumption, supply voltage and oper­ating hours.

• External sensors SM 100: Reception of data from
external sensors by means of an SM 100 sensor
module and control according to the data received,
e.g. flow rate, pressure, water level and conductiv­ity.

• Communication module: Monitoring and commu­nication via a data BUS (GENIbus), a modem or ra­dio, e.g. PC-based control/monitoring.

Fig. 10

Fig. 11

Fig. 12

R100

CU 3

200 mm

SM 100

200 mm

MS Motors

CU 3

54.5 mm

192.5 mm

54.5 mm

192.5 mm

Single-turn transformers, 100-400 A.
No monitoring of motor temperature.

GR0244 - GR1911TM00 7308 1102TM01 4020 1102TM00 7866 1096

100 mm

106 mm

89 mm

50 mm

Signal converter, 1-20 A/20-120 A, with
monitoring of motor temperature.

Fig. 13

330 mm

50 mm

37

Accessories

Technical data

Enclosure class: IP 20.

Ambient temp.: –20°C to +60°C.

Relative humidity: 99%.

Voltage variation: –25/+15% of nominal voltage.

Frequency: 45 Hz to 65 Hz.

Max. back-up fuse: 10 A.

Relay output: Max. 415 V, 3 A, AC 1.

Approvals: The CU 3 complies with: VDE,

DEMKO, EN, UL and CSA.

Marking: CE.

Benefits of CU 3/R100

CU 3 is suitable for all 3-phase submersible motors.

MS Motors

Parameters monitored by
CU 3

Temperature

Motor current The motor is stopped when the rated motor current set is exceeded. Motor starter/protective relay

Overvoltage/undervoltage If the actual value is higher/lower than the value set, the motor is stopped. Line monitor

Dry running

Phase asymmetry/direction of
rotation

Energy consumption in kW/h

Operating hours

Starting delay Programmable. Time-delay relay

Restarting delay Programmable limit of starts/stops. Time-delay relay

Star-delta starting Corresponding to a star-delta time-delay relay. Time-delay relay

Description

The actual motor temperature is measured by means of the Pt100.
The value measured is transferred via a separate cable to a relay.

The motor power input is measured on each of the three phases and registered as
an average of these three values.
If the average value is lower than the value set, the motor is stopped.

The motor power input is measured on each of the three phases.
If the input phase sequence is changed, a fault indication is given.

The power is read and accumulated every 10 seconds.
The energy consumption is calculated and accumulated every 2 hours.

Running when the motor relay is activated.
Stopped when the motor is not running.

These components need not be
installed

Level relay 3 electrodes,
electrode cable

Phase monitoring

Counter (not calibrated)

Operating-hours counter

38

Accessories

Control functions

This table describes the protection provided by CU 3.

Control
parameters

Ground failure Insulation resistance is measured only

Temperature The actual motor temperature is measured

Overvoltage/
undervoltage

Overload The motor power input is measured on

Dry running The motor power input is measured on

Current unbalance The power input of the motor is measured

Phase sequence CU 3 and motor are installed so that the

Function Problem Advantages

when motor is not operating.

A high-impedance voltage is applied to the
motor leads and leakage to ground is
measured. If the factory-set value is
higher than the one measured the motor
cannot be started.

by means of the Pt100. Via a relay, the
signal is sent to the CU 3 where the
measured temperature is compared with
the factory-set value. Temperature protec­tion requires a submersible motor with a
Pt100.

If the factory-set values are exceeded, a
fault indication is given. If the CU 3
receives a temperature signal, the voltage
is no longer monitored, but the motor will
continue to run.
Therefore, the motor and consequently
the pump operation will be affected by
voltage variations critical to the life of the
motor.

If there is no temperature signal, the motor
will be stopped in case of overvoltage/
undervoltage.

each of the three phases. The registered
power input is average of these three
values. If the factory-set value is
exceeded, the motor will stop.

each of the three phases. The registered
power input is an average of these three
values.

If the average value is lower than the
factory-setting value, the motor will stop.

on each of the three phases.

phase sequence corresponds to correct
direction of rotation.

CU 3 monitors changes in the phase
sequences.

Damaged or decom­posed insulation in
motor, cable or cable
joint.

Overload, frequen start
s/stops, operation
against blocked
discharge pipe, insuffi­cient flow velocity past
the motor.

The installation is close
to a transformer, the
mains do not absorb
load variations.

Incorrect dimensioning
of pump/motor, voltage
supply failure, defective
cable, blocking, wear or
corrosion.

Pump exposed to dry
running or underload,
for example caused by
wear.

Mains load is uneven,
incipient motor defect,
phase voltages diver­ging.

Two phases are
wrongly connected.

MS Motors

Possibility of failure
indication on motor,
cable and cable joint,
service indication.

Longer motor life, safe
operating conditions,
service indication.

Important installation
parameter, possibility
of improving operating
conditions.

Longer pump lift,
safe operating
conditions, service indi­cation.

Traditional dry-running
protection is no longer
necessary, no extra
cables.

Motor protection
against overload,
service indication.

Ensures correct pump
performance.

39

Accessories

pg

Features and benefits

MS Motors

Selecting the right pump

The Grundfos CU 3 control unit and a flowmeter provide
for a constant monitoring of energy consumption and
performance of the pump thus making it possible to
ensure that the right pump is selected for the applica­tion in question.

The CU 3 control unit makes it possible to choose the
borehole(s) to be in operation which offer(s) the lowest
operating costs.

Choosing the right time for service

The constant monitoring by the CU 3 control unit makes
it possible to service the pump, i.e. clean it and replace
wear parts, at the best possible time.

Today service and maintenance work is often carried
out at regular intervals or when actual downtime
occurs. Both are unlikely to result in an optimum
energy-efficient operation.

Avoiding overpumping

Using the Grundfos CU 3 control unit and a water level
sensor it is possible to carry out test pumping of each
borehole. This is done by measuring the water table
level and the volume of water which is pumped. The
purpose is to ensure that only the water naturally
running to the borehole is pumped. As a result opera­tions will provide for optimum efficiency. Consequently,
the lives of both borehole and pump will increase, since
both water aeration and the risk of ingress of aggres­sive water are reduced.

Fig. 14

Fig. 15

Operating costs

kWh

Time

TM00 7296 1096TM00 7297 1096TM00 7298 1096TM00 7299 1096

Time for service

kWh

Time

Time

Reducing costs of water treatment

By minimizing the risk of overpumping and thus the
pumping of impure ground water the costs of water
treatment can be reduced to a minimum.

Using the Grundfos CU 3 control unit and a sensor it is
possible to measure water conductivity in each bore­hole. This provides for the possibility of selecting the

40

borehole (or boreholes) to be in operation which
supplies the best water quality at any time.

Fig. 16

Conductivity

Time

Fig. 17

Accessories

MS Motors

Motor protection via CU 3

• Power on

• Motor on

• Motor temperature

• Ground failure

• Overload/dry running

• Overvoltage/undervoltage

• Current unbalance

• Direction of rotation

CU 3

Netz ein

Trockenlauf (blinkt) / !berlast (leuchtet)

Unterspannung (blinkt) / !berspannung (leuchtet)

Motor læuft

Massefehler

Stromasymmetrie

Reset

Motortemperatur Phasenfolge

Signal converter
1-12 [A], 10-120 [A]
or single transformers
100-400 A
3 x 230 V, 60 Hz
3 x 460 V, 60 Hz

Control unit CU 3 with R100
remote control and printer

• Power on

• Motor on

• Motor temperature

• Ground failure

• Overload/dry running

• Overvoltage/undervoltage

• Current unbalance

• Direction of rotation

CU 3

Wireless infra-red
communication

Trockenlauf (blinkt) / !berlast (leuchtet)

Netz ein

Unterspannung (blinkt) / !berspannung (leuchtet)

Motor læuft

Massefehler

Stromasymmetrie

Reset

Motortemperatur Phasenfolge

Signal Converter
1-12 [A], 10-120 [A]
or single Transformers
100-400 A, 3 x 230 V, 60 Hz
3 x 460 V, 60 Hz

R 100

Connection to Pump.
No extra Cable required.
High-frequency signals.

Fig. 18

Control Cabinet

Ground level

Water level

Riser Pipe

Submersible Pump

Submersible Motor with
Tempcon or Pt100

Control Cabinet

Connection to Pump.
No extra Cable requred.
High-frequency Signals.

Ground level

Inductive Flowmeter

Water level

Riser Pipe

Submersible Pump

Submersible Motor with
Tempcon or Pt100

TM00 7977 1702

TM00 7978 1702

Fig. 19

41

Accessories

MS Motors

R100 Menus

0. General

1. Operation

1.1 Warning and stop indication.

1.2 Indication of automatically reset fault indications.

Possibility of start and stop.

2. Status

Indication of:

2.1 Motor temperature

2.2 Current and voltage values.

2.3 Average supply voltage.

2.4 Average input current of the three phases.

2.5 Actual current unbalance.

2.6 Actual insulation resistance to earth.

2.7 Phase sequence and frequency.

2.8 Actual power input and total power consumption.

2.9 Accumulated number of operating hours.

2.10 Value measured by an external sensor.

2.11 Energy consumption per m

2.12 Actual flow.

2.13 Accumulated flow.

3. Limits

Indication and setting of:

3.1 Motor temperature.

3.2 Current stop limits.

3.3 Current warning limits.

3.4 Voltage variations.

3.5 Insulation resistance.

3.6 Currrent unbalance.

3.7 Stop for external sensor.

3.8 Warning limits for external sensor.

4. Installation

Setting possibilities:

4.1 Automatic or manual resetting of fault indications.

4.2 Release time for fault indications.

4.3 Star connection time for star-delta or

auto-transformer starting.

4.4 Starting delay when first started, e.g. after supply

failure.

4.5 Minimum start cycle time.

4.6 On/off of groundwater lowering function.

4.7 Run/stop times for groundwater lowering.

4.8 Electronic numbering of CU 3 units.

4.9 On/off of power and temperature measuring

funciton.

4.10 External sensor type. On/off of external analog

sensor with or without zero offset.

4.11 Groundwater lowering by means of level sensors.

Filling and emptying function.

4.12 On/off of external digital sensor.

3

pumped liquid.

Status report

All settings and measured values can be transferred to
a portable printer via wireless infra-red communication
and be printed in a status report.

Wireless infra-red
communication

CU 3

CU 3

Fig. 20

IR-Printer

Fig. 21

R100

R100

R 100

TM00 7981 1702TM00 7982 1302

42

Accessories

Menu Structure of the R100 Remote Control

MS Motors

Set

Light

0. General

1. Operation

1.1

1.2

Start

Contrast

2. Status 3. Limits 4. Installation

2.1

2.2

2.3

2.4

2.5

2.6

3.1

3.2

3.3

3.4

3.5

3.6

4.1

4.2

4.3

4.4

4.5

4.6

2.7

2.8

2.9

2.10

2.11

2.12

2.13

3.7

3.8

4.7

4.8

4.9

4.10

4.11

4.12

TM01 0226 0201

43

Accessories

MS Motors

Complete Borehole Monitoring
System with CU 3 and SM 100

Monitoring parameters (Diodes)

• Power on

• Motor on

• Motor temperature

• Ground failure

• Overload/dry running

• Overvoltage/undervoltage

• Current unbalance

• Direction of rotation

(not supplied with the unit)

PC

Gateway
(not supplied with
the unit)

Digital inputs

For Analog Sensors

Communication
Module

Signal Converter
1-12 [A], 10-20 [A]
or single-turn trans­formers 100-400 A
3 x 230 V, 60 Hz
3 x 460 V, 60 Hz

Connection to Pump.
No extra Cable required.
High-frequency Signals.

CU 3

RS-485

Inductive flowmeter

Water level

Riser Pipe

SM 100

Control Cabinet

Ground level

SM 100

The SM 100 sensor module can be connected to eight
analog sensors and have eight digital inputs for
sensors, e.g. monitoring of

- pH value

- conductivity

- O

2

- pressure

- etc.

CU3 CU3 CU3 SM100

Protokoll-

umsetzer

(bauseits)

GRUNDFOS-GENIbus

max. 1200 m

PC

Fig. 23

Maximum connection to the GENIbus:

• 28 CU 3 units, or

• 14 CU 3 units and 14 SM 100 units, or

• 27 CU 3 and 1 SM 100.

Product numbers

CU 3 - 3 x 460 V

Product number

62500293 z

62500294 z

62500295 z

Product

Sensor module SM 100 3 x 460 V 00626191

Communication module RS 485 - 00626159

Remote control R100 - 00625333

HP printer for R100 - 00620480

Signal converter

Current range for signal converter [A]

1-12 10-120 100-400

CU 3 expansion possibilities

Range Product number

1-12 [A] 00620497

10-120 [A] 00620498

100-400 [A] 00626148

TM00 7980 1702

Submersible Pump

Submersible Motor with
Tempcon or Pt100

Fig. 22

44

TM00 7979 1702

Further product documentation

Sources of product documenta­tion

In addition to the printed data booklet, Grundfos offers
the following sources of product documentation.

• WinCAPS

• WebCAPS.

WinCAPS®

WinCAPS is a Windows-based Computer-Aided
Product Selection program containing information on

more than 90,000 Grundfos products.

Available on CD-ROM in more than 15 languages,
WinCAPS offers

• detailed technical information

• selection of the optimum pump solution

• dimensional drawings of each pump

• detailed service documentation

• installation and operating instructions

• wiring diagrams of each pump.

Click on Catalog and
select a product from the
extensive product catalog.

Fig. 24 WinCAPS CD-ROM

Click on Sizing and select
the most suitable pump
for your application.

cd-wincaps.

Fig. 25 WinCAPS

WinCAPS_US.

45

Further product documentation

WebCAPS®

WebCAPS is a Web-based Computer Aided-Product
Selection program and a web-version of WinCAPS.

Available on Grundfos’ homepage,
www.grundfos.com, WebCAPS offers

• detailed technical information

• dimensional drawings of each pump

• wiring diagrams of each pump.

Click Catalog and
select a product from
the extensive
product catalog.

Click Replacement
and select the right
replacement pump
based on the
current installation.

Click Literature to
select and download
Grundfos documentation
by browsing the product
ranges or performing
a specific search. The
literature includes:

- Data booklets

- Installation and
operating manuals

- Service etc.

Click Product
search and select
a product from the
extensive product
catalog.

Click Service to
to find information
on service kits and
spare parts.

Being a registered
user click Log in to:

- save your settings

- define and save your
own units

- save personalized
information.

Click Units and select your
preferred units of measurement:

- Default units

- SI units

- US units.

Click Language and
select your preferred
language.

Fig. 26 WebCAPS

46

WebC APS_U S.

47

Being responsible is our foundation

L-MS-PG-001 01/05

US

Thinking ahead makes it possible

Innovation is the essence

GRUNDFOS Pumps Corporation

17100 West 118th Terrace
Olathe, Kansas 66061
Phone: [phone]
Telefax: [phone]

GRUNDFOS Canada Inc.

2941 Brighton Road
Oakville, Ontario L6H 6C9 Canada
Phone: [phone]
Telefax: [phone]

www.grundfos.com

Bombas GRUNDFOS de Mexico S.A. de C.V.

Boulevard TLC No. 15
Parque Industrial Stiva Aeropuerto
Apodaca, N.L. Mexico 66600
Phone: [phone]
Telefax: [phone]

Subject to alterations.