Polaris TBM 200 LH - Manual (Page 38)

2
Horsepower requirements are a function of pump
design, impeller size & head and flow conditions.
In gas operating time is a function of pit size,
pump capacity, and flow conditions. Only the
pump manufacturer can insure that the pump
motor is properly applied for continuous inĆgas
or vapor operation. As with any motor product,
it is essentialthat proper consideration be given
to the load characteristics to insure the motor
product will not be overloaded. Should such an
overload occur, thermostats embedded in the
windings willprovide a signalto deenergize the
motor. However, proper consideration of the
application will prevent such an overload.
With reference to the diagram in figure 1, the
following load conditions should be noted:
A. Below level #1 (bottom of the pump) fluid is
not pumped and no load is reflected to the
motor.
B. One pump should always be sized sufficientĆ
ly large to draw the well down (even
under maximum flow conditions). The maxiĆ
mum amount of time the motor will operate
fully loaded and uncovered is the amount
of time required to draw the well down
from level #2 (top of the motor) to the bottom
of the pump.
C. Time described in B above should not be
greater than 15 minutes if full motor nameĆ
plate horsepower is required for this operaĆ
tion. (See Application Instructions).
D. The above application notes do not make
allowance for:
(a) The heat exchanger effect of the attached
pump. It is pumping a relatively cool fluid
and will remove some heat.
(b) The motor does not operate fully loaded
completely in gas. It is fully loaded as the
motor is being uncovered.
(c) If the well is being drawn down from the
top of the motor and maximum flow
conditions exist, the influent flow will
usually provide excellent cooling of the
pump motor.
FIGURE 1
INSTALLATION
IMPORTANT
Read this manual thoroughly before installaĆ
tion.
1. The user must select a motor starter and
overĆcurrent protection suitable for this
motor and its application. Consult motor
starter application data as well as the
National Electric Code and/or other local
codes.
2. Maximum submergence of motor is not to
exceed 200 feet in depth and/or 200 P.S.I. at
motor seal.
3. Thermal Protectors must be connected.
Leads marked P1 and P2 (See Figure 2).
4. Moisture Sensing Probes must be conĆ
nected. Leads marked W1 and W2. (See
Figure3).
5. Check your power supply against final
nameplate connection voltage.
If required, the impeller should be heated slightĆ
ly before pressing it on the shaft. Under no
circumstances should the impeller be driven on