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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 

1.5 

2.5 

75 

Max. lenght 

40 60 100 

100 30 

45 

70 

150 20 

35 

55 

200 10 

25 

40 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

en 

 

 

 

 

 

 

 

 

 

 

 

 

   

T

L1 

Black

Grey

Brown

C

Yellow/Green

1- Common 
2- Main 
3- Auxiliary  
C- Capacitor 
T- Thermic relay 

1

2

3

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