MANUALE D’USO ROUTE - rev. 2 – 10/01
6
6 MOTOR
Electrical connections
The electrical connection to the motor terminal determines the direction of rotation of the motor and can be
verified by looking at the cooling fan at the rear of the motor ( for the Argal pump this has to rotate clockwise
looking at the front end).
With single phase motors the direction of rotation may be reversed by changing the position of the
connection plates:
With three-phase motors the direction of rotation may be changed by swapping any two of the three
conductors independently of the type of connection to the windings:
The windings of three-phase motors ( e.g. with (a) 230-400 V; (b) 400-600 V) require a delta-connection for
lower voltage ( 230 volts for a ; 400 volts for b).
They require a star-connection for higher voltage (400 volts for a; 690 volts for b).
Star/Delta starting is used when the motor power is above 7.5 kW (10 HP ) only in case of frequent starts
and short running times, but always when the motor power is above 15kW (20 HP ). All this is also to
safeguard the structure of the pump.
Protection level
The initials IP are followed by two numbers :
The first number indicates the level of protection against penetration of solid objects and in particular :
4 for solids whose dimension is greater than 1mm
5 for dust (eventual internal deposits will not harm operation)
6 for dust (no pentetration)
The second number indicates the protection against the penetration of liquids. In particular:
4 for water sprays from all directions
5 for jets of water from all directions
6 for tidal and sea waves.
According to the IP protection indicated on the identification plate of the motor and to the environmental
conditions, arrange for opportune extra protections allowing in any case correct ventilation and rapid
drainage of rainwater.
7 DRY
RUNNING
SURVEY
Though the pump can run dry (execution R
1
-R
2
) , it is therefore suitable to safeguard the pump and the plant
to use:
-
pressure switch;
- fluxmeter;
- control devices for the motor power absorbtion.
N
L
N
L
T
S
R
W
V
U
Z
Y
X
S
T
R
W
V
U
Z
Y
X
T
S
R
W
V
U
Z
Y
X
T
S
R
W
V
U
Z
Y
X
