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Weight
Motor Type
(Kg.)
1.5/22
17
UMA I 100
2.2/22
22
3/22
38
4/22
40
6/22
45
UMA I 150
8/22
48
9/22
58
13/22
66
16/21
79
UMA G
21/21
90
24/21
98
Table No. 2 : Weight of Motor
In addition to the above, the weigtht of the water column present
in the riser pipe also needs to be considered. Refer Table No. 3
for weight of water column.
Bore of pipe Wt. of water
column
inch
mm
lb/ft.
kg/m
1.5
40
0.9
1.3
2
50
1.3
2
2.5
65
2.2
3.3
3
80
3.4
5
4
100
5.4
8
Table No. 3 : Weight of water column
3.3
Motor preparations for installation
3.3.1 Motor filling
Before installation in the well, the motor must be filled with clean
potable water. The following procedure may be adopted for filling:
• Place the motor vertically up.
• Remove the two plugs provided at the top of the motor (One
plug is for air ventilation and another is for water filling).
• Fill the motor completely with clear potable water (Do not
use distilled / acidic water).
• Let the motor stand for 30 minutes, rotate motor rotor by
hand or rock the top end of the motor slightly for natural
venting.
• Top up the water to fill the loss of volume caused by the
escaped air.
• Plug the motor.
• Check the motor for any water leakage.
Now motor is ready to couple to the pump.
3.3.2 Insulation resistance (IR)
The insulation resistance value (with 500 V DC megger) should
not less than 20 Mega Ohms for the new motor & 2 mega ohms
for old motor. If observed, please contact KSB or Authorized
Dealer before switching the motor ON.
Bore of pipe
Wt. of water
column
inch
mm
lb/ft.
kg/m
5
125
8
12
6
150
12
18
8
200
21.5
32
10
250
33
49
Submersible Motor Pumps
3.3.3 Selection of Extended Cable :
Proper selection of cables ensures smooth and safe operation
of the pumpset. For the selection of extended cable, voltage
drop needs to be calculated. Voltage drop for extended cable
should not be more than 3 % of rated voltage i.e.Permissible
voltage drop = Avaiable voltage at site x 0.03
For three phase motor :
Voltage drop = Cable Length in meters x Resistance / meter
for particular cable size (as per Table No 4 below) x motor rated
current (mentioned on the name plate)
Permissible voltage drop is up to 12.5 volts (Considering
available voltage at site is 415 volts).
e.g. A 3 ph motor with cable length of 100 mtr, the cross-
sectional area 2.5mm
and rated current 4 A,
2
The Voltage drop = 100 x 0.0075 x 4
= 3 volts (which is less than permissible
voltage drop)
Cross - section area
(mm
)
2
1.5
2.5
4.0
6.0
10
16
25
35
50
Table No 4 : Resistance / meter for different cable sizes
3.3.4 Extended Cable connection
Only the proper cable connection ensures a perfect watertight
joint and provides a protection against mechanical damage to
the cable jointing and offers good electrical connection. Thus,
while connecting extra cable beyond standard cable length
(supplied with motor), it is necessary to have a watertight cable
joint for the cable connection.For which the following procedure
will help -
• Cut and strip the cable leads.
• Join it in staggered fashion as shown in the Fig.1.
(Ensure that the same color leads joined to each other as
per the Fig.1)
• Wrap vulcanizing rubber compound to each cable joint and
then wrap it with insulation tape.
• Once again wrap vulcanizing rubber compound and
insulation tape on each joint to ensure proper insulation.
• Finally wound the total cable joint with electric insulation tape.
(Oil or grease should not come in contact with electric
insulation tape)
• Complete the taping over core insulation at each side.
Note : Please see that each turn of the tape should have 50%
overlap over the previous turn. The tape should be wound to
the thickness at least equal to that of core insulation.
2
(150 mm and above)
Resistance in Ohm / m
At 30
C
o
0.0124
0.0075
0.0047
0.0031
0.0019
0.0012
0.00073
0.00054
0.00040
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