Motor Operation; Proper Motor Cooling; Providing A Check Valve And Level Sensor; Switching On The Motor - Franklin Electric 262 Serie Manual De Instrucciones

6

Motor Operation

6.1

Proper motor cooling

Caution
6.2

Providing a check valve and level sensor

6.3

Switching on the motor

6.4

Motor operation with frequency converter

Damage to the motor and the motor cable due to overheating
Make sure that the coolant flow speed along the motor is sufficient.
Make sure that the short motor cable is always fully surrounded by transport medium for proper
cooling.
Figure 6-1: Cooling tube
If the required minimum coolant flow speed cannot be reached (e.g. if the inlet opening of the well is
located above the motor or if using large-diameter wells):
Fit a cooling tube (see figure 6-1).
Make sure that the cooling tube encases the entire motor and the pump water inlet opening.
The motor is force-cooled.
Provide one spring-loaded check valve in the production tube in case no such check valve has been
fitted in the pump.
Ensure that the check valve is no further than 7 meters away from the pump.
Install a level sensor for wells with a highly varying water inflow.
All action steps of the previous chapter have been carried out properly
Switch on the motor using the mains switch in the control cabinet.
Measure the following values after switching on:
- Motor operating current in every phase
- Mains voltage when motor is running
- Level of the medium to be transported
Immediately switch off the motor if:
- the nominal current as specified on the type plate is exceeded,
- voltage tolerances of more than, 50Hz: -10 % to +6 %/ 60Hz: ± 10%, relative to the nominal
voltage are measured on the motor,
- there is a risk of the motor running dry,
- motor current deviates from the mean value of all three currents by more than 5 %.
Note
When operating a motor with a frequency converter, the relevant operating manual must be observed!
Make sure that the motor current in all operating levels of the regulating range does not exceed the
nominal motor current indicated on the type plate.
Adjust the frequency converter so that the limit values for the nominal motor frequency of min. 30 Hz
and max. the value of the nominal motor frequency (50 or 60 Hz) are observed.
Rewindable Submersible Motors
6 Motor Operation
11