Further Instructions For Six-Cables Motors Terminals Connection; Commissioning And Startup; Startup - DAB SMC6 Instrucciones Para La Instalación Y El Mantenimiento

Are necessary:
– An overload protection,
A short circuit protection,
–
such protections should trip on all three phases.
We suggest besides protections against:
– Phase drop,
– Voltage drop,
– Water level drop.
Star/delta starting
Motor cables are marked with letters U1-V1-W1 and U2-V2- W2.
They have to be connected to control panel terminals, respectively:
U1- V1- W1 and U2-V2-W2 for clockwise rotation
(seen from motor/pump coupling).
In case of counterclockwise rotation, reverse terminals U1- V1 and
U2- W2.

7.5 Further instructions for six-cables motors terminals connection

Six cables motors can be started with a Star/Delta starter only if
main voltage is at least equivalent to the motor minimum rated
voltage.
To obtain the correct rotation direction, find main
terminals L1, L2 and L3 as previously described.
8.

COMMISSIONING AND STARTUP

8.1 Startup

Start the pump with gate valve half opened to check rotation direction. When the water starts flowing, close further the gate valve:
–
pressure rating should be higher than rated pressure value. If this is not the case, the rotation direction is wrong. Reverse two motor
phases to restore the correct rotation direction.
The pump should not run in the wrong sense for more than 3 minutes. Close then the gate valve to about the half of its full opening and
–
leave the pump running for a minute. Stop then the pump for five minutes to allow the dissolution of air bubbles which, if present, might
endanger shaft lubrication.
Start the pump and gradually open the delivery gate valve till the water shows free of sand, or till the suspended sand has dropped to a
–
sufficiently low percentage (40 g/m³).
Before definitively commissioning the pump, remove starter fuses and check the electric circuit integrity with an ohm-meter to make sure
–
there have been no damages when lowering the pump in the well. If the results are negative, lift the group again and check it thoroughly.
For three-phases units, the electric resistance value should be nearly the same for each phase.
–
Check insulation resistance to the ground (i.e. between cable end and discharge pipe) using a megahoms-meter. Minimum value to the
–
ground for a new pump is 10 megahoms with cold motor.
– However, if some misfunctioning is detected during startup, stop immediately the pump and investigate the problem.
Check also that the pump runs within its operating limits and that voltage rates reported on control panel do not exceed motor nameplate
–
rated values.
Connection
Electrical
equipment
ENGLISH
Electropumps turning
counterclockwise direction viewed
from the delivery mouth.
DOL, stator and autotransformer starting
Motor cables are marked with letters U1, V1, W1 and have to be connected to control panel terminals, respectively:
U1, V1, W1 for clockwise rotation (seen from motor/pump
coupling). For counterclockwise rotation, reverse two of the cables.
21
in a
Electropumps turning in a clockwise
direction viewed from the delivery
mouth.
Connection
Electrical
equipment
Connection
Electrical
equipment