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10
8 Operating troubles
Troubles Cause
Remedial
action
The pump starti and
stops.
a) Incorretct voltage or voltage drop.
b) Open-circuit in motor power cord.
c)
The motor protection trips out.
a) Check the voltage durino starting; if the cable cross-section is too
small, the voltage drop may be such that the motor cannot function
normally.
b) Measure the resistance between phases. Refit the pump if
necessary and check the cable.
c)
Check the current settino on the thermal relay and compare it to the
indicated value. Important: do not insist if the relay trips out
repeatedly (try to locate the cause); forced operation of the unit
could damage the motor (by overheating) in a very short time.
The pump fails to
deliver or the
discharge flow is too
small,
a) Voltage
low.
b) Suction strainer clogged.
c)
Wrong direction of rotation (three-
phase motor).
d) No water in borehole, or level too
low.
a) Check the supplì voltage at the box.
b) Refit the pump: unclog and clean.
c)
Interchange two phase wires at the box.
d) Check the level; it must be at least 150 mm above the pump
strainer (with pump running).
Pump starti too often.
a) Differential on pressare-sensitive
switch too small.
b) Float or electrodes (PMS)
incorrectly placet.
c)
The bladder tank is too small or is
insufficiently pressurized.
a) Increase the Stop/Start difference.
b) Ad just the distance between them so that the time between the
stopping and starting of the pump reasonable.
c)
Chek and ad just the pressures (On/Off). Chek the pressure in the
tank. Add a tank to increase capacity or change the tank.
9 Single phase wiring connection
10 Cables lenght
Diver Model
Sect. mmq
1
1.5
2.5
75
Max. lenght
40 60 100
100 30
45
70
150 20
35
55
200 10
25
40
en
T
L1
N
Black
Grey
Brown
C
Yellow/Green
1- Common
2- Main
3- Auxiliary
C- Capacitor
T- Thermic relay
1
2
3