Flowserve PLEUGER Bedienungsanleitung PDF herunterladen (Seite 32)

PLEUGER STANDARD USER INSTRUCTIONS ENGLISH 71569293 01-13

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7.3 Switching off the unit

To minimize water hammer the control valve (see

item 8, figure 3-1) must be closed before the unit will

be switched off. After the valve has been closed the

unit must be switched off within 2 to 3 minutes.

8 MAINTENANCE

Submersible pump units normally run without needing

maintenance.

If a pump unit should stand idle for a lengthy period of

time, perform a 10 minute test run every month, so

that potential malfunctions can be recognized in time.

The pump unit must be completely

submersed in pumping medium for this test run.

8.1 General information

As the units are normally used at very great depths, it

is recommended that the following checks are

performed and recorded at regular intervals, in order

to recognize malfunctions in time:

 Current consumption

 Head

 Flow

 System voltage

 Operating hours

 Insulation test

 Temperature (only if temperature sensors

PT100 [RTD] exist)

Current consumption of the motor is the most

important test for monitoring the unit.

For finding problems, their cause and elimination, see

section 9, Faults; causes and remedies.

8.2 Pump units

The pump unit can be operated without maintenance,

insofar as there are no irregularities in operation or

pumping, caused by sand or a corrosive pumping

medium, that make premature removal necessary.

Fluctuating and or rapidly increasing current

consumption indicate mechanical problems in the

pump or motor.

Strong oscillation of the pressure, and at the same

time of the ammeter, can be caused by irregular

water inflow.

8.3 Measuring insulation

8.3.1 Motor including power supply cable

Before initial starting, or after long storage or idle

time, the insulation resistance of the drive must be

measured.

During and after measurement, the

conductor ends of the motor power cable and or

the connection terminals may carry dangerous

voltage (up to the test voltage) and must not be

touched. Before measuring, ensure that there is

no line voltage.

To measure the insulation of the system, disconnect

all leads of the power supply cable.

All leads must be carefully cleaned to remove dirt or

corrosion. Follow the instructions given with the

insulation measurement instrument.

Insulation measurement is always performed with a

measuring-circuit voltage of 500 volts. The value

must be read for the duration of a minute.

The motor windings or power cable, charged up to the

measuring-circuit voltage, must be discharged after

measurement using the insulation-measuring device.

The minimum insulation resistance and critical

insulation resistance limits for measurements at a

winding temperature of 20 °C (77 °F) are as follows:

New motors

Over 150 M

Minimum insulation value of new motors

with power supply cable

5.0 M

Critical insulation value after longer

operation time

0.5 M

If the insulation value is near the minimum, causes

could be increased air humidity and or dirty, moist

conductor ends or a winding temperature higher than

20 °C (77 °F).

A relatively low insulation resistance does not

definitely show that the motor will break down due to

insulation problems.

However the insulation must be inspected, if after

measurements over a longer period, an extreme drop

in the insulation resistance occurs within a short time.

If the insulation resistance falls below the minimum

value, the cause must be determined or the faulty

part (power cable, line connection or windings)

identified and the insulation weakness removed.

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