Xylem TVS - Manual (Page 40)

Installation, Operating and Maintenance Instruction
Model TVS
page 32
to the level of the motor rated current as stated on
the rating plate. The ammeter indicator must stand
still.
Checking the direction of rotation. After filling the
pressure lines completely (check at the pressure
gauge faucet), read the pressure on the pressure
gauge when the pressure valves are almost
closed. The pressure level shown on the pressure
gauge plus the geodetic difference in level
between the water level and the measuring point
must correspond approximately to the delivery
according to the pump characteristic curve in the
range of zero flow rate. Otherwise the direction of
rotation must be altered by interchanging two
phases and then check the pressure again.
Motors which are only suitable for rotation in one
direction should not be allowed to run in reverse
for long. Pumps with single stage alternating
current motors will certainly run in the proper
direction if they are connected properly.
During the pump test it is necessary to keep the
plant under constant observation and to check the
current consumption and discharge. For new wells
or bore holes with unknown yield we recommend
checking the fall in water level as well as the sand
content of the water during the first period of
operations. Excess sand content (more than 50
g/m
3 ) can lead very quickly to wear and reduced
output of the unit.
After insulation values have been measured again
after a few hours of operation the plant can be
operated automatically. To obtain comparable
values for winding resistance: Allow the motor to
cool for at least one hour before measuring.
Restarting
Each time operations are restarted proceed as in initial
operations. However, it is unnecessary to check the
insulation values, the direction of rotation or to
measure winding resistance.
6.1 Operation and Monitoring
Regular monitoring and maintenance will extend
the life of your pump or system.
You must observe the area of application given in
the Confirmation of Order.
Do not exceed the output given on the motor
rating plate.
Avoid dry running, running against closed
discharge valves.
Pay attention to the permitted number of starts.
6.2 Limits of Operation
The operating limits of the pump / unit regarding
pressure, temperature, performance and speed
are shown in the data sheet and / or order
confirmation and must be observed under any
circumstances!
Do not exceed the output given on the motor
name plate.
6.2.1 Flow min. / max.
If no other data are given in the curves or data sheets,
the following is valid:
Recommended minimum flow
for continuous operation [m 3 /h] Pump Size
50 Hz 60 Hz
TVS 8.1-… 10 12
TVS 8.2-… 15 18
TVS 8.3-… 22 27
TVS 8.4-… 30 36
TVS 10.1-… 40 50
TVS 10.2-… 60 80
TVS 10.3-… 80 100
TVS 12.1-… 150 180
TVS 12.2-… 200 -
Maximum flow [m 3 /h]
for vertical and horizontal installation Pump Size
50 Hz 60 Hz
TVS 8.1-… 75 90
TVS 8.2-… 105 125
TVS 8.3-… 135 160
TVS 8.4-… 170 200
TVS 10.1-… 200 240
TVS 10.2-… 250 280
TVS 10.3-… 320 360
TVS 12.1-… 400 400
TVS 12.2-… 520 -
Values are valid under the requirement NPSH
Plant
>
(NPSH
Pump
+ 0,5 m)
6.2.2 Minimum depth of coverage
U
min
Pump Size mm
…refers to a
velocity of water
of max. …m/s in
the case space
between the
pump and well
casing.
TVS 8.1-…
TVS 8.2-…
TVS 8.3-…
TVS 8.4-…
1000 4,2
TVS 10.1-… 1600
TVS 10.2-…
TVS 10.3-…
2900
4,5
TVS 12.1-…
TVS 12.2-…
2900 6,8
6.2.3 Permitted number of starts
With electric motors, the permitted number of starts is
given in the attached motor operating instructions.
If there are not specified values for the operating
cycles in the motor instruction manual, then the values
of diagram 1 are valid.