Flowserve PLEUGER User Manual download pdf (Page 13)

PLEUGER STANDARD USER INSTRUCTIONS ENGLISH 71569293 01-13

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3.5.2 Rotor

The rotor winding consists of induction welded copper

bars with short-circuit rings. The rotors are

dynamically balanced and are protected against

corrosion by a protective varnish. The drive shaft end

is made of stainless steel.

3.5.3 Bearings

The "Michel type" axial thrust bearing is located in the

motor base and is designed to handle very high thrust

loads; it is dimensioned so that it can support the

axial thrust of the pump rotating assembly as well as

all hydraulic loads.

The thrust bearing is bi-directional. A fixed counter-

thrust bearing is also provided. The journal bearings

are slide bearings.

The motor filling liquid lubricates the journals and

thrust bearings.

3.5.4 Mechanical seal

The motor is equipped with a single directional

operating mechanical seal, which can operate in both

directions of rotation.

3.5.5 Starting procedures

The motors can have different operating modes and

starting procedures. Essentially, these are:

 Direct-on-line (DOL)

 Star-delta starting

 Starting via an auto-transformer

 Starting via soft-starter. (See also section 3.5.6,

Starting via soft-starter.)

 Static-frequency converter operating. (See also

section 3.5.7, Static-frequency converter operating

with submersible motors.)

 Single-phase motor - refer to Flowserve

For direct-on-line (DOL), Star-delta starting and starting

via an auto-transformer the electrical data and the

connection diagram for the motor have to be followed.

These are marked in the technical data sheet.

For all other operating modes special procedures

have to be followed that are described in detail below.

3.5.6 Starting via soft-starter

Pleuger submersible motors can be operated via

“soft-start and soft-stop devices”. These instructions

relate to radial and mixed flow pumps.

Axial flow pumps must be referred to the

manufacturer on an individual basis.

A compensation-capacitor must not be installed at the

junction between soft-start and soft-stop devices and

the motor.

Power output reduction is not necessary if the

conditions in section 5.6, Adjustments for soft-starter

and soft stop devices, are observed.

Soft-start ramp up and soft-stop ramp down times

must be clarified with the manufacturer after the

hydraulic system data is finalised.

3.5.7 Static-frequency converter operating with

submersible motors

Technical data needs to be taken from the

specific data sheet.

For submersible motors that are later converted to

static-frequency converter operation, the required

data must be requested from the manufacturer.

3.5.8 Direction of rotation

The direction of rotation depends on the pump type.

Reversing two phases of the power supply will

change the direction of rotation of all three-phase

squirrel-cage motors. (Changing the direction of

rotation of a single-phase motor is not possible.)

3.5.9 Resistance thermometer PT100 (RTD)

Either one or two temperature sensors PT100 (RTD)

are installed with pressure and watertight connections

to a signal cable. As the temperature sensors are

mounted on the winding head they can only be

removed after dismantling the motor.

3.6 Pump and check valve

Radial or semi-axial centrifugal pumps are used as

single or multistage pumps. The pump stages of

pump types NB6 and NB8 are bolted together with

tie-bolts. The pump bowls of all other types of pumps

are bolted together one by one.

The dynamically balanced impellers are fixed to the

pump shaft by means of keys. The pump shaft runs

in journal bearings that are lubricated by the pumped

medium.

Power transmission for 6 in. (152 mm) and 8 in.

(203 mm) motors is via a spline coupling; on all other

motors a keyed coupling is used.

The check valve of pump types NB6 and NB8 is an

integral part of the pump. On all other pump types

the check valve is an independent part, mounted onto

the discharge casing of the pump.

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Flowserve PLEUGER User Manual Page 13

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