Hydraulic Connections; Electrical Connections - salmson MV 2000 Instalacion Y Puesta En Servicio

ENGLISH

5.2. Hydraulic connections

Connect pipes fitted with the counter-flanges supplied.
- Suction down.
- Discharge up.
Keep the horizontal part of the suction pipe short and avoid
features that might cause a loss of head (bends, valves, tapers,
etc.).
The diameter of the pipes must not be less than:
• MV 2400/2800 : round screw-on counter-flanges
for 2 1/2" (66-76) dia. pipe
• MV 2500/2900 : round weld-on counter-flanges
for 3" (80-90) dia. pipe
- Take care not to stress the flanges of the pump, so that it can
function properly.
- Do not have the pump bear the weight of the piping; use
supports, collars, etc.
- Make the piping tight with Teflon or Loctite Calorétanche 572.
Note: The use of pressurized bladder tanks rules out the use of
air replacement systems (see Fig. 3).

5.3. Electrical connections

The electrical connections and checks must be made by
a licensed electrician and comply with applicable local
standards.
• The motor must be protected by a safety switch.
- Provide a magneto-thermal relay set to the current rating
marked on the motor data plate and a fuse disconnecting
switch (type aM).
• Use cables meeting EDF standards.
- Cable with 4 conductors (3 phases + earth) to connect
mains power to the terminals as shown by the diagram under
the cover of the terminal box (or see Fig. 5).
DO NOT FORGET TO CONNECT THE EARTH.
A connection error would damage the motor. The power
cable must never touch the pipe or the pump, and must
be kept away from any moisture.
- Check that the installed capacity can deliver the starting
current (5 to 8 times the nominal current).
- If not, use a star-delta starter connected to the mains.
6. STARTING UP
6.1. Filling, degassing
Never operate the pump dry, even momentarily.
Pump in suction (see Fig. 1)
- Close the discharge valve and completely fill the pump and
the suction pipe using the funnel, which must first have been
loosened.
- Retighten the funnel after filling.
Pump under pressure (see Fig. 2)
- Close the discharge valve and fill the pump completely.
- Loosen the funnel a few turns, and the suction valve, until all air
has been eliminated.
Note: Protect the pump against any accidental loss of priming
(vortex, lowering of water level, etc.) by a pressure or float
switch. Sucking in too much air can cause such a loss, and in this
case the pump must be stopped and re-primed.
6.2. Adjustments
Shaft rotation before starting
- Check, at the motor/pump coupling, that the shaft turns freely,
with no sticking.
If necessary, insert a 12-mm-dia. rod through one of the
openings in the coupling guard, into one of the holes on the
coupling, to unstick the moving parts.
Direction of rotation of motor
- Switch the motor on (brief press on safety switch) and check
that it turns in the direction indicated by the arrow.
- If it turns the wrong way, interchange two phase wires on the
motor terminal block.
Check of motor protection
- With the motor stopped, disconnect one phase; switch the
motor on and check that it trips out immediately.
6.3. Commissioning
The pump must not be operated for more than 10 minutes
in the no-flow condition.
In permanent operation, allow a minimum flow of about 10 to
20 % of the full capacity of the pump.
- 4.5 to 8 m3 for MV 2400/2800.
- 9 to 15 m3 for MV 2500/2900.
• Operate the pump (with the discharge valve open).
- For operation with a large back-pressure, unscrew the funnel
a few turns to bleed.
- Wait for water to flow out, then screw the funnel
back in.
- Check the stability of the pressure on the pressure gauge; if it
is not stable, bleed and/or fill again.
- Check that the current draw does not exceed the value
marked on the motor data plate.
Risk of burning. In operation, the motor may be
ATTENTION !
hotter than 100°C.
7. MAINTENANCE
No special servicing in operation. Keep the pump perfectly
clean.
Drain the pump and the pipes during periods of frost and fill the
pump with a special antifreeze liquid to prevent fouling.
Replacement frequencies
Remark: These are necessarily only guidelines, since the
replacement frequency depends on the operating conditions:
• Temperature and pressure of the liquid pumped for the
mechanical seal;
• Load and ambient temperature for the motor and other
components.
Part or component
subject to wear
Operating life
continuous
Replacement
duty
frequency
15 h/day
in service
9 months/year
8
Pump cage bearings
Mechanical Pump bottom
seal bushing
Motor bearing
10.000 to 15.000 to
20.000 h 30.000 h
1 to 2 years 2 to 3 years
2 to 5 years 4 to 8 years
Motor
winding
25.000 h
max. amb.
temp. 40°C
3 years
6 years