Electrical Connections - dreno Compatta Serie Manual De Uso

6. Electrical connection
All the electrical connections must be executed by a qualiied electrician.
The frequency and tension of the net must correspond to those indicated on the pump plate.
ATTENTION: Stop the power supply before opening the electropump. You can access the connection area,
unscrewing the screws that connect the cover to the motor casing in the models Compatta *(EVO) , BIC *(EVO),
Alpha-V *(EVO) , AM-AT, DNA e DNB ..2/110/150, while for DNA ..-2/220, DNA - DNB 4 poles, and Grix, contact
a specialized workshop.
• For the electrical connections, look them up in the schemes.
• In the threephase motors, check the rotation direction of the impeller (see the rotation direction section).
• Never force the pump to work without having found and corrected the cause of bad operation.
• In order to prevent water iniltrations in the pump, when you reassemble the cable, always use a new gasket
(cable gland) and be sure that the cable entry gland is perfectly closed.
All the electrical connections must be protected against humidity and all joints must be absolutely watertight.
ELECTRICAL DRAWINGS
Connection Connection
Singlephase 230V Threephase 230V / 400V
U1 V1 W1 T1 T2
1 2 3 4 5
M
3∑ ˜
Motor Protection T1-T2
The models DNA ..2/220 (-1), DNA ..4/090, DNB ..2/220 (-1/-2), DNB 80-4/110 are equipped with thermal de -
tectors T1-T2 in the winding (that must be connected to a control box equipped with suitable protection
contacts), which promptly warn and stop the pump when the motor overheats. This safety device is normally
closed and opens at a temperature of 130°C, thereby cutting out the pump from its power supply, and closes
back only when the temperature reaches 75°C.
Starting Kickback
Rotation direction (only for threephase pumps)
After every new connection, loss of phase or tension, it is probable
that the phases are inverted, so check the rotation direction. The wrong
rotation direction causes the overheating of the motor, involves strong
vibrations and considerably reduces the pump capacity. To check the
right impeller rotation direction you have to tilt lightly the pump and
start it.
ATTENTION: keep away from the impeller at the pump starting.
Pay attention at the starting kickback, that may be harmful.
If the pump gives you an anticlockwise (bird's-eye view) kickback when
starting, the connection is right, otherwise stop the power supply and
invert the two phases.
Seen from the suction inlet, the right impeller rotation is anticlockwise.
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