salmson MULTI-V Serie Instalacion Y Puesta En Servicio página 13

ENGLISH
8 . OPERATING TROUBLE
Switch the pump OFF before doing any work on it.
For MULTI-VE pumps fitted with motor variator, see the specific
leaflet.
If the liquid is toxic, corrosive or dangerous for human
being, SALMSON must be informed or the qualified person in
charge of the repairing. In this case, clean the pump to
ensure o complete safety to the repairing man.
TROUBLES
8.1 PUMP TURNS BUT NO a) The internal parts are obstructed by forei-
DELIVERY gn bodies :
b) Suction pipe obstructed :
c) Air leaks in via suction pipe :
d) The pump has lost its priming :
e) The suction pressure is too low; this is
generally accompanied by cavitation
noise :
f) The supply voltage of the motor is too
low :
8.2 THE PUMP VIBRATES a) Loose on its foundation :
b) Foreign bodies obstructing the pump :
c) Pump is hard to turn :
d) Incorrect electrical connection :
8.3 THE MOTOR OVERHEATS a) Voltage too low :
b) Foreign bodies obstructing the pump :
c) Ambient temperature above +40°C :
d) Coupling failure in the terminal box :
8.4 THE PUMP DELIVERS a) he motor fails to run at its normal speed
INSUFFICIENT PRESSURE (foreign bodies...etc.) :
b) The motor is faulty :
c) Pump poorly filled :
d) The motor turns the wrong way (three-
phase motor):
e) The drain priming plug is not correctly
tightened :
f) The supply voltage to the motor is too
low :
8.5 THE CIRCUIT-BREAKER a) The setting of the thermal relay is not ade-
DEVICE IS ON quate (too low) :
b) The voltage is too low :
c) One phase is open-circuit :
d) The thermal relay of the circuit-breaker is
faulty :
e) A fuse is off :
8.6 THE FLOW IS IRREGULAR a) The suction height (HA) is exceeded :
b) The diameter of the suction pipe is smaller
than that of the pump :
c) The strainer and suction pipe are partially
obstructed :
CAUSES
a) Dismantle the pump and clean it.
b) Clean all the pipes.
c) Check the tightness of the whole pipe, up to the pump, and make it tight.
d) Fill the pump to re-prime. Check that the foot valve is tight.
e) Loss of head on suction or suction height too great (check the NPSH of the pump installed).
f) Check the voltage on the terminals of the motor and the cross-section of the conductors.
a) Check the nuts of the stud bolts and tighten them fully.
b) Dismantle the pump and clean it.
c) Check that the pump turns freely without abnormal sticking.
d) Check the connections to the pump.
a) Check the voltage on the terminals of the motor; it should be within ± 10 % of the rated
voltage (± 6 % if 60 Hz).
b) Dismantle the pump and clean it.
c) The motor is designed to operate at an ambient temperature of not more than +40°C.
d) Be in conformity with the motor plate and see FIG. 4.
a) Dismantle the pump and correct the problem.
b) Replace it.
c) Fill the pump and bleed until there are no more air bubbles.
d) Interchange two phase wires on the motor terminal block or on the circuit-breaker to
reverse the direction of rotation.
e) Check it and screw it again.
f) Check the voltage on the terminals of the motor and the cross-sections of the conductors.
a) Check the current with an ammeter, or set to the current rating marked on the motor
data plate.
b) Check that the conductor cross-sections of the power cable are adequate.
c) Check it and, if necessary, replace the power cable.
d) Replace it.
e) Replace it.
a) Study again the installation conditions and recommendations in this data sheet.
b) The suction pipe must have the same diameter as the pump suction port.
c) Remove and clean.
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REMEDIES