SPERONI CS Series, Operating Instructions Manual

Page: 5 / 24

5
In such instance the maximum rated flow rate should
be reduced, to avoid the overload protection tripping
too often.
– The pump should not be subjected to more than
20 startings per hour, to avoid excessive thermal
stress on the motor.
Where a star-delta starter is used, the above number
of startings per hour may the slightly increased.
– The pump should not run for long periods with
closed sluice valve at the delivery. Where this is
inevitable, or in all such instances where the delivery
rate is to be modulated, proceed as directed under
the section “installation”.
– All pumps which are installed in places unprotected
from frost must be emptied whenever they remain
inoperative, and flushed inside with water emulsified
with a corrosion inhibitor.
6. Maintenance
The electric pumps do not require any scheduled
maintenance, as the motor bearings are pre-packed
for life and the mechanical seals are lubricated by
the pumped liquid.
7. Connection
The six terminal arrangement with delta ( ) or star
(
) connection allows for the motors.
Star connection
( )
400 V ( )
700 V ( )
240 V ( )
415 V ( )
230 V ( )
400 V ( )
Delta connection
( )
T
V2 W1
W2
R
V1
S
U2 U1
S
V1
V2
U2 W2
U1 W1
T R
S T R
V1 W1 U1
U2 V2 W2
S T R
V1 W1 U1
U2 V2 W2
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