Motor Recommended wire size, AWG
1
Hp Motor
Phase
Volts Approximate Full
Load Amperes
Length of Run (ft)
0–100 to 200 to 300
3 1 115 34.0 6 4 2
220 17. 0 12 8 8
3 230 9.6 12 12 12
460 4.8 12 12 12
5 1 115 56.0 4 1 1/0
230 28.0 10 6 4
3 230 15.2 12 12 10
460 7.6 12 12 12
7-1/2 1 230 40.0 8 6 4
3 230 22.0 10 10 8
450 11.0 12 12 12
10 3 230 28.0 8 8 8
460 14.0 12 12 12
15 3 230 42.0 6 6 6
460 21.0 10 10 10
20 3 230 54.0 4 4 4
460 27.0 8 8 8
25 3 230 68.0 2 2 2
460 34.0 6 6 6
30 3 230 80.0 1 1 1
460 40.0 6 6 6
40 3 230 100.0 2/0 2/0 2/0
460 52.0 4 4 4
50 3 230 130.0 3/0 3/0 3/0
460 65.0 2 2 2
1
Based upon 3% voltage loss copper wire type TW. Single phase motor
calculations are based on two times distance.
Improper motor wiring will cause expensive motor
difficulties from low voltage. If you suspect you have
low voltage, call your power company. Connecting your
motor for the voltage you have available is important
too. The motors furnished with the stationary pumps are
usually dual voltage, so you must be sure of the voltage
your power company is supplying you. Your motor will be
completely ruined if it is connected to the wrong voltage.
A humid climate can cause problems, particularly in
explosion proof motor applications. The normal breathing
of the motor, and alternating between being warm when
running and cool when stopped, often will cause moist
air to be drawn into the motor housing. This moist air will
condense, and may eventually add enough free water
to the inside of the motor to cause it to fail. To prevent
this, make a practice of running the motor and pump at
least once a week on a bright, dry day for an hour or so
(pumping through the bypass system). In this period the
motor will heat up and vaporize the condensed moisture,
and drive it out of the motor. No motor manufacturer will
guarantee an explosion proof or totally enclosed motor
against damage from moisture.
Engine drivers pose a special consideration. The
manufacturer’s instructions must be followed. When the
stationary pump is equipped with an engine from the
factory, the engine speed should normally not exceed
1,800 RPM. Excessive engine speed will overload the
engine and cause early failure. The engine loses 3% of
its power for every 1,000 feet (305 m) above sea level,
so if your installation is at a higher altitude than normal,
consult the factory.
Chapter 2—Operation Procedures
Performance curves and charts are provided in Appendix C.
The following steps should be performed for the initial
pumping operation:
1. Verify the strainer screen is clean.
2. Rotate the pump by hand.
3. Check V-belt drive or direct drive coupling alignment.
Misalignment will cause accelerated wear of the drive
system, motor bearings and pump.
4. Check motor for proper wiring.
5. Review complete system to make certain the function
of every valve and piece of equipment is clearly
understood. Everyone operating this system must be
properly trained in normal operating procedures and
emergency procedures in event of a malfunction.
6. Close all hose valves.
7. Slowly open the storage tank bottom shut-off valve
(suction line to the pump). Immediately check the
system for leaks.
8. Open any shut-off valves between the bypass valve
and the storage tank.
9. Make a note of all pressure gauge readings, especially
the pressure gauge located at the discharge of the
pump. Start the pump and circulate the liquid through
the bypass system back to the storage tank.
10. Verify the proper pump rotation direction. There is an
arrow cast in the pump case.
11. An ammeter may be used by adjusting the bypass
valve until the ammeter indicates the full load motor
amperage rating shown on the motor nameplate or
maximum rated differential, whichever comes first.
Permit the pump to circulate liquid for half an hour or
more. If the motor overload protection device stops
the motor in this period the bypass valve setting is
too high and should be readjusted until the motor
will run for half an hour. After a satisfactory setting is
achieved, “seal” the valve adjusting stem to prevent
tampering with the adjustment. See IH102 for more
details on the use of the Corken bypass valves.
12. If your pump has an internal relief valve, it must be
set higher than the external bypass setting. The
internal relief valve may be adjusted while the pump
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