Motor Operation; Making Sure That The Motor Is Cooled Sufficiently; Providing A Check Valve And A Level Sensor; Switching On The Motor - Franklin Electric 6 Serie Manual De Instrucciones

6

Motor operation

6.1

Making sure that the motor is cooled sufficiently

Caution
6.2

Providing a check valve and a level sensor

6.3

Switching on the motor

6.4

Operating a motor with a 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 first check valve is no further than 7 m (metres) 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 -10 % / +6 % to 50Hz and +/- 10% to 60Hz, relative to the nominal
voltage are measured on the motor,
- there is a risk of the motor running dry,
- a 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!
 VFD operation is only permitted up to a supply voltage of 460 V. For higher voltages, please contact
Franklin Electric Europa GmbH.
 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.
Encapsulated Submersible Motors
6 Motor operation
11