Electrical Connection; Operation With Frequency Converter; System Filling - Venting - salmson NEXIS-V 2 Instalacion Y Puesta En Servicio

ENGLISH

7.5 Electrical connection

W RNING! Electrical shock hazard!
Dangers caused by electrical energy must be excluded.
- Electrical work by a qualified electrician only!
- All electrical connections must be performed after the electrical
supply has been switched off and secured against unauthorized
switching.
- For safe installation and operation a proper grounding of the
pump to the power supply's grounding terminals is required.
- Check that operating current, voltage and frequency used com-
ply with motor plating data.
- The pump must be connected to the power supply by a solid
cable equipped with a grounded plug-connection or a main
power switch.
- Three-Phase motors must be connected to an approved motor
starter. The set nominal current must correspond to the electrical
data on the pump motor name plate.
- The supply cable must be laid so that it never touches the
pipework and/or the pump and motor casing.
- The pump/installation should be grounded in compliance with
local regulations. A ground fault interrupter can be used as extra
protection.
- The connection to the network must be in accordance with the
connection plan (FIG. 5).

7.6 Operation with frequency converter

- Motors used can be connected to a frequency converter in order
to adapt pump performance to duty point.
- The converter must not generate voltage peaks at motor terminals
higher than 850V and dU/dt slope higher than 2500 V/µs.
- In case of higher value, an appropriate filter must be used : con-
tact converter manufacturer for this filter definition and selection.
- Strictly follow instructions provided by the converter manufacturer
data sheet for installation.
- Minimum variable speed should not be set below 40% of pump
nominal speed.
8. ST RT UP

8.1 System filling - Venting

C UTION! Possible damage of the pump!
Never operate the pump dry. The system must be filled
before starting the pump.
8.1.1 ir evacuation process – Pump with sufficient supply pressure
(FIG. 3)
- Close the two guard valves (2, 3).
- Unscrew the air bleed screw from filling plug (6a).
- Slowly open the guard valve on the suction side (2).
- Retighten the air-bleed screw when air escapes at the air bleed
screw and the pumped liquid flows (6a).
W RNING! When the pumped liquid is hot and the pressure
high, the stream escaping at the air bleed screw may cause
burns or other injuries.
- Open the guard valve on the suction side completely (2).
- Start the pump and check if direction of rotation matches the one
printed on pump plating.
C UTION! A wrong direction of rotation will cause bad
pump performances and possibly coupling damage.
- Open the guard valve on the discharge side (3).
8.1.2 ir evacuation process – Pump in suction (FIG. 2)
- Close the guard valve on the discharge side (3). Open the guard
valve on the suction side (2).
- Remove the filling plug (6b).
- Open the drain-priming plug not completely (5b).
- Fill the pump and the suction pipe with water.
- Make sure that there is no air in the pump and in the suction pipe:
refilling until complete removal of air is required.
- Close the filling plug with air bleed screw (6b).
- Start the pump and check if direction of rotation matches the
one printed on pump plating.
C UTION! A wrong direction of rotation will cause bad
pump performances and possibly coupling damage.
- Open the guard valve on the discharge side a little (3).
- Unscrew the air bleed screw from filling plug for air venting (6a).
- Retighten the air-bleed screw when air escapes at the air bleed
screw and the pumped liquid flows.
W RNING! When the pumped liquid is hot and the pressure
high, the stream escaping at the air bleed screw may cause
burns or other injuries.
- Open the guard valve on the discharge side completely (3).
- Close the drain-priming plug (5a).
8.2 Starting up
C UTION! The pump must not operate at zero flow (closed
discharge valve).
D NGER! Risk of injury!
When the pump runs, coupling guards must be in place,
tightened with all appropriate screws.
W RNING! Important noise!
Noise emitted by most powerful pumps could be very high:
protection must be used in case of long stay close to the
pump.
W RNING! Installation must be designed in order that no
one could be hurt in case of fluid leakage (mechanical seal
failure...).
9. M INTEN NCE - SERVICE
ll servicing should be performed by an authorized service repre-
sentative!
W RNING! Electrical shock hazard!
Dangers caused by electrical energy must be excluded.
All electrical work must be performed after the electrical
supply has been switched off and secured against unautho-
rized switching.
W RNING! Risk of scalding!
At high water temperatures and system pressure close isolat-
ing valves before and after the pump. First, allow pump to
cool down.
- These pumps are maintenance free.
- In option, mechanical seal could be easily replace thanks to its
cartridge seal design. Insert its adjusting wedge in its housing
(FIG. 6) once mechanical seal position is set.
- Always keep the pump perfectly clean.
- Pumps which are not being used during periods of frost should be
drained to avoid damage: Close the guard valves, open com-
pletely the drain-priming plug and the air bleed screw.
15