23
EN
5.5 Measuring insulation resistance
Insulation must be measured with the relative instrument (500 V DC) before and after the
electropump is put in the water, assembled at the site of use.
→
Before submersion, connect a measuring cable to the earth wire.
→
Make certain the contact zones are clean.
→
Connect in series the other measuring cable with each wire of the cable connected to the
motor.
Insulation resistance is measured by the insulation measuring instrument.
Minimum insulation resistance with extension:
•
with a new motor > 20 M
Ω
Information
Minimum insulation resistance without extension:
•
with a new motor > 500 M
Ω
5.6 Electrical connection of the submersible electropump
___________________________________________________________________________________
Risk of death due to an electric shock.
→ Before connecting the motor electrically, make certain the system is completely disconnected
from the power and that when working no one can accidentally turn the power on.
______________________________________________________________________________________________
Pay attention to the data on the rating plate and size the electrical equipment accordingly. The
connection examples given in this chapter refer to the motor itself and are not a suggestion
concerning the control elements installed upstream.
All the actions in the previous chapter have been done correctly.
Connection diagram for three-phase motors
5.7 Installation of the submersible electropump
Before installing the submersible electropump it’s necessary to respect the following
safety rules:
→
Clean the well from sand or grit by applying the normal cleaning procedures.
→
Fit a stub pipe on to the pump delivery after having fitted the support bracket in two
halves to the other end. Make sure to clamp the screw (if it is present) on the
electropump to avoid the risk of backing off.
CONNECTION FOR DELTA START
CONNECTION FOR STAR-DELTA START
U2
U2
CONNECTION FOR DIRECT START
CONNECTION FOR STAR
W2
U2
V2
Power leads
Motor leads
Connect together and
insulate with connection
L3
W1
L2
L1
U1
V1
W1
U1
V1
L1
L2
Electrical
panel
U1
V1
W1
V1 U2
W2
U1
L1
L2
U1
V1
W1
U1
V1
W1
W1
V1
U1
V1
U1
L1
L2
L3
Connection
V2
L3
W2
V2
W1
L3
W1
V2
W2
Electrical
panel
Power leads
Motor leads
Connection
Motor leads
Power leads
Electrical
panel
Connection
Electrical
panel
Connection
Power leads
Motor leads
