Electrical System; Electrical Connection - EBARA GSD-Serie Übersetzung Der Originalanleitung

- If the manometric height is high.
- If the operation is automatic or in parallel
- When filling a tank under pressure
- To reduce the effect of water hammer
3. Fit any vent valves in those points of the system where it is impos-
sible to avoid the formation of air bubbles. However, they should
not be fitted where the pressure is lower than atmospheric pressu-
re, as the valve will draw in air rather than expel it.
4. During installation, check that the flange gaskets are in place and
do not protrude inside or outside the pipe.
5. On a new system, make sure clean pipes free from defects and
welding residues are used. In these cases it could be useful to
install a temporary filter on the suction flange (usually for the first
48 hours of operation) to prevent any deposits and residues from
entering.
6. Suction systems:
- The lower end of the suction duct must remain submerged and
at a depth of at least twice the diameter of the duct (2D) as well
as at a distance from the bottom of 1, 1 and a half times the
afore-mentioned diameter (1~1.5 D).
- Fit a base valve with filter at the start of the suction pipe to pre-
vent the entry of foreign bodies.
- The suction line will be installed with an upward slope towards
the pump (more than 1%) to avoid the formation of air bubbles.
The connections between ducts and other accessories will take
place in such a way that no air suction is created between the
various elements. They must therefore be perfectly sealed.
- Make sure that the intake duct is as short and as straight as
possible, seeking to avoid unnecessary bends and paths. Avoid
areas where air pockets can form as in the figure (Fig.1). Do not
fit any shut-off valves in this section.
- Install the pump at suction height according to the project
- Unless the design for assembly indicates otherwise, use the
dimensions of the suction pipe and eccentric reduction, re-
commended in this Table. The eccentric reducer (Fig.2) will be
installed with an upward slope towards the pump to avoid the
formation of air bubbles.
DNA x
DNM
50 x 32
65 x 40
65 x 50
80 x 65
100 x 80
125 x 100
150 x 125
200 x 150
Unless specified in the order, do not use pipes with a DN (internal
diameter of the same) lower than that indicated.
7. In systems with load suction:
- It is advisable to fit a shut-off valve in the intake duct in order to
simplify the disassembly and overhaul operations.
- Install the suction line with an upward slope towards the pump to
avoid the formation of air bubbles.

9.5 ELECTRICAL SYSTEM

Check that the motor is cooled correctly by keeping the air inlets and
outlets unobstructed. It is advisable to assemble the equipment in a
ventilated place away from heat sources.
The condensate drain vents must be located in the lower part of the
motor. When it is not dangerous for the protection of the motor, the
drain plugs can be removed.

9.5.1 ELECTRICAL CONNECTION

FIG. 1
ALL THE ELECTRICAL CONNECTION OPERA-
TIONS OF THE EQUIPMENT MUST BE CARRIED
OUT BY QUALIFIED PERSONNEL AND IN THE
ABSENCE OF ELECTRICAL VOLTAGE. DAN-
GER OF ELECTROCUTION. USE PROTECTIVE
GLOVES AND ALL THE DEVICES REQUIRED BY
CURRENT LOCAL LEGISLATION.
- Use power cables with a section sufficient to pass the maximum
current absorbed by the motor, in addition to the margin established
by the local regulations in force, thus avoiding overheating and/or
voltage drops (voltage drops during start-up must be less than 3%).
- Perform earth connection. Check correct connection of the protecti-
ve conductor to the terminal marked with the symbol
- Make the cables reach the terminal board with a curvature that pre-
vents water from penetrating, sliding on them (see figure).
FIG. 2
- The contact surfaces of the connections must remain clean and
protected from rust. Do not place washers or nuts between the mo-
tor terminals and the mains access terminals.
- Check the tightness of the cable gland thus guaranteeing the de-
gree of protection indicated on the plate.
- Prevent the transmission of mechanical tensions towards the motor
terminals.
- Respect the current and frequency limits indicated on the motor
data plate.
- The installation of a differential magneto-thermal switch is recom-
1500 r.p.m.
Pipe DN Reduction Pipe DN
65 65x50 80
80 80x65 100
100 100x65 125
125 125x80 150
150 150x100 200
200 200x125 250
250 250x150 300
300 300x200 ---
3000 r.p.m.
Reduction
80x50
EN
100x65
125x65
150x80
200x100
250x125
300x150
---
.
9