Franklin 2007 ユーザーズマニュアル

Franklin submersible motors are designed primarily for 
operation in the vertical, shaft-up position. 

During acceleration, the pump thrust increases as its 
output head increases. In cases where the pump head 
stays below its normal operating range during startup and 
full speed condition, the pump may create upward thrust. 
This creates upward thrust on the motor upthrust bearing. 
This is an acceptable operation for short periods at each 
start, but running continuously with upthrust will cause 
excessive wear on the upthrust bearing.

With certain additional restrictions as listed in this section 
and the Inline Booster Pump Systems sections of this 
manual, motors are also suitable for operation in positions 

Franklin Electric submersible motors are a water-
lubricated design. The fi ll solution consists of a mixture 
of deionized water and Propylene Glycol (a non-toxic 
antifreeze). The solution will prevent damage from 
freezing in temperatures to -40 °F (-40 °C); motors should 
be stored in areas that do not go below this temperature. 
The solution will partially freeze below 27 °F (-3 °C), 
but no damage occurs. Repeated freezing and thawing 
should be avoided to prevent possible loss of fi ll solution.

There may be an interchange of fi ll solution with well 
water during operation. Care must be taken with motors 
removed from wells during freezing conditions to
prevent damage.

When the storage temperature does not exceed 
100 °F (37 °C), storage time should be limited to two 
years. Where temperatures reach 100° to 130 °F, storage 
time should be limited to one year.

Loss of a few drops of liquid will not damage the motor 
as an excess amount is provided, and the fi lter check 
valve will allow lost liquid to be replaced by fi ltered well 
water upon installation. If there is reason to believe there 
has been a considerable amount of leakage, consult the 
factory for checking procedures.

The average number of starts per day over a period 
of months or years infl uences the life of a submersible 
pumping system. Excessive cycling affects the life of 
control components such as pressure switches, starters, 
relays and capacitors. Rapid cycling can also cause 
motor spline damage, bearing damage, and motor 
overheating. All these conditions can lead to reduced 
motor life.

The pump size, tank size and other controls should be 
selected to keep the starts per day as low as practical for 
longest life. The maximum number of starts per 24-hour 
period is shown in table 3.

Motors should run a minimum of one minute to dissipate 
heat build up from starting current. 6" and larger motors 
should have a minimum of 15 minutes between starts or 
starting attempts.

from shaft-up to shaft-horizontal. As the mounting position 
becomes further from vertical and closer to horizontal, the 
probability of shortened thrust bearing life increases. For 
normal motor life expectancy with motor positions other 
than shaft-up, follow these recommendations:

1.  Minimize the frequency of starts, preferably to fewer 

than 10 per 24-hour period. 6” and 8” motors should 
have a minimum of 20 minutes between starts or 
starting attempts

2.  Do not use in systems which can run even for short 

periods at full speed without thrust toward the motor.

Up to 0.75

Up to 0.55

300

300

1 thru 5.5

0.75 thru 4

100

300

7.5 thru 30

5.5 thru 22

50

100

40 and over

30 and over

-

100

3