Electric System; Electric Protections; Rotation Direction; Motors Terminals Connection - DAB SS6 Instructions De Mise En Service Et D'entretien

6.1 Power supply cable connection
The supply cable should be selected according to the
Ampere flow, showed on motor nameplate.
If the cable is not supplied with the motor, it should
suit the following requirement:
Its section should correspond to the one
a)
recommended by the motor manufacturer
according to carried power, installation depth
and motor starting system .
b) Warranty required: up to 600V in water.
c) Motor connection should be performed with
extreme care.
d) The cable should show no cuts, cracks, scratches
or other damages.
If two cables have to be joined in parallel, pay extreme
attention when connecting cables of the same color.

6.2 Electric system

The motor is connected by the supply cable to the control
panel which contains the necessary control and
protection devices. Since
mechanical or electric, will damage almost automatically
the motor windings, it is necessary for the control and
protection equipment to be adequate and reliable.
Economy may, in this case, produce unpleasant results.
We recommend besides an efficient grounding of the
.
control panel

6.3 Electric protections

In all case of:
– DOL starting,
– Star/ Delta starting,
– Stator starting,
– Autotrasformer,
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.

6.4 Rotation direction

Check motor rotation direction before coupling the
motor to the pump, so to avoid any damage to motor
thrust bearing.
Find and mark by means of cyclic
phase indicator, whose pointer is turning
clockwise, mains terminals L1, L2 and
L3 and connect them to control panel
terminals L1, L2 and L3.
Electropumps turning in a counter-
clockwise direction viewed from the
delivery mouth
ENGLISH
every difficulty, either
Electropumps turning in a clockwise
direction viewed from the delivery
Connection
Electrical
equipment
Connection
Electrical
equipment
6.5 Further instructions

motors terminals connection

Connection
Electrical
equipment

7. COMMISSIONING AND STARTUP

7.1 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
21
Star/delta starting
Motor cables are marked with
letters U1-V1-W1 and U2-V2-
W2. They have
connected to control panel
terminals, respectively: U1-
V1- W1 and U2-V2-W2
for clockwise
(seen from motor/pump
coupling)
.
In case of counterclockwise
rotation, reverse terminals U1-
V1 and U2- W2.
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
from motor/pump coupling).
For counterclockwise
rotation, reverse two of the
cables.
for six-cables
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.
to be
rotation
(seen