Xylem IMVS R01 Model VS Vertical Industrial Turbine Pumps User Manual

Page 8

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9. After the well head has been properly tightened,

carefully rotate the entire unit in the well until the

discharge flange is facing in the desired direction. Push

the unit to one side of the well, providing the maxi-

mum clearance for the drop cable when rotating the

unit.

10. Slowly lower the well head onto its mounting

surface. BE CAREFUL NOT TO DAMAGE THE

GROUNDING SYSTEM OR PINCH THE POWER

CABLE BETWEEN THE SURFACE PLATE AND

THE WELL CASING. If a gasket or other seating

device is used, be sure that it is aligned properly and

that it is not damaged. Install the mounting bolts.

11. Before connecting the power cable to the control

panel:
Take a resistance reading between the power cable

conductors and ground to assure that the insulation

on the cable or splice was not damaged during instal-

lation. See Appendix C.
Measure the resistance of the power cable and motor

circuit. See Appendix C. Compare these readings with

those taken in Section 4 to assure that the splice is still

intact. Make the electrical connection between the power

cable and the control panel. It may be desirable to use a

terminal box at the well head to simplify the electrical

work required when the pump is pulled. Be sure that the

unit is grounded properly.

FAILURE TO GROUND THE UNIT

PROPERLY CAN RESULT IN SERIOUS

OR FATAL SHOCK. REFER TO ELECTRICAL CODE

REQUIREMENTS.

Be sure to connect the leads as they were marked

previously in the procedure.

SECTION 6 — STARTING THE PUMP

INITIAL STARTUP AND TESTING

MAY REQUIRE STARTING AND

STOPPING THE PUMP SEVERAL TIMES. BE SURE

TO ALLOW ADEQUATE COOLING OFF PERIOD

BETWEEN STARTS. CONSULT THE MOTOR MAN-

UAL. IF NO INFORMATION IS GIVEN, A GOOD

RULE-OF-THUMB IS TO ALLOW A MINIMUM OF

15 MINUTES BETWEEN STARTS.
For initial startup, allow the water to be pumped out

onto the ground. A throttle valve in the discharge line is

recommended. Position the throttle valve approximately

one-forth open for startup of the pump. This will prevent

surging the well or the pump during startup.
If the pump has been in the well for several days before

the startup, check the resistance between the cable con-

ductor and ground to assure that water has not penetrat-

ed the splice or the cable insulation. See Section 4.
Clamp the tongs of a clamp-on type ammeter around

one power lead to the pump. Set the ammeter on the

maximum scale. After the motor starts, it can be reset to

a lower scale as desired.
Refer to the motor manual and determine the normal

operating amps for the installed motor.
Start the pump and observe and record the current

readings on each conductor of the power lead. If the

WARNING

CAUTION

current exceeds the normal value determined in the mo-

tor manual, stop the pump immediately. A high current

reading indicates that something is wrong. Among the

potential problems are:

• Incorrect pump rotation (3 phase only)
• Improper voltage
• Sand locked pump
• Improper cable size or leak in cable
• Mechanical damage

In any case, the problem must be corrected before the

pump can be operated.
On three phase units, if water does not appear within

one minute (deeper settings may require approximately

one half minute per 100 feet setting) the motor may be

running backwards. Stop the pump and interchange any

two of the three cable connections. If there is any doubt

about the proper rotation, run the motor in one direction

and then the other. The rotation that gives the highest

pressure and flow is always the correct one.
Check the voltage. The voltage when the pump is run-

ning should be within 5% of the pump motor nameplate

voltage.
Open the throttle valve. If a flow meter is available, open

the throttle valve to rated flow of the pump. If sand ap-

pears in the water, throttle the pump at approximately

80% of full flow until the sand clears. If excessive noise

develops, pressure fluctuates or water appears foamy

white, the pump is probably cavitating and the flow

should be throttled until the noise diminishes, the pres-

sure remains steady and the water is clear.
On three phase units, check for current unbalance.

Details of the current unbalance test are given in the Ap-

pendix C. THE MAXIMUM ALLOWABLE CURRENT

UNBALANCE IS 5%. If the current unbalance exceeds

5% after rolling the leads and connecting them for the

lowest unbalance, the pump should be stopped and cor-

rective action taken. Current unbalance in excess of 5%

can be expected to cause excessive heating in the motor

and premature failure. Operation with a current unbal-

ance in excess of 5% will void the warranty.
After the unit is operating properly, a performance test

should be considered. If a performance test is conducted

when the pump is new, subsequent tests can be used to

determine the degree of wear or deterioration of the

pump without removing it from the well. After the unit

has been in operation for approximately one week, per-

form the routine tests.

SECTION 7 — PUMP DISASSEMBLY AND

REASSEMBLY

1. Clear a large area adjacent to the pump as storage

space for pump parts as they are disassembled. If the

pump has a long column, arrange parallel timbers on

the ground to support the pump column horizontally.

After disassembly for repair or replacement of pump

components, reassemble in all cases in the reverse

order of disassembly.

NOTE: PUMP COMPONENTS SHOULD BE

MATCH-MARKED PRIOR TO

DISASSEMBLY.

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