Use Limitations - EBARA OY4 Series Installation And Operating Instructions Manual

USE LIMITATIONS

For good operating of the motor, installed in a 4" well, is necessary to follow these conditions:
-maximum depth of motor immersion is 100m
-maximum allowable starts per hour:30 at even intervals;an upper quantity means that the programming of the
hydraulic system is wrong.
-maximum allowable rating voltage fluctuation :-10%/+6%
-maximum well water temperature :40°C
-the electric motor utilizes the water flow, produced by the pump, to assure a suitable heat exchange not lower
than 0.08 m/sec.
It's possible to determine water speed applying the following formula:
V=10.6Q/(Dp²-8760)
V= water flow speed (m/sec.)
Q= flowrate (lt/min)
Dp=well inner diameter (mm)
PRECAUTIONSAND PRELIMINARY CHECKS
During transportation and unpacking, care should be taken to avoid hitting the motor.
Check that the power cable has not been damaged.
Don't use the power cable to make the motor handling.
Motor power rating is adeguate for the required application.
The voltage and the frequency of the power source must agree with the specifications given on the motor
nameplate.
Do not unscrew the filling plug, there is no need to top up the coolant in this type of motor.
Clean up the well before installation of the motor-pump.
POWER CABLEAND DROP
The power supply cable must be suitable to immersion.The diagram below show the maximum possible
admitted length of the cable(unit of measure m) possible considering the cross section of the conductors. Those
schedules are true for a maximum voltage drop of 3% with a working temperature of 30°C.