salmson MUH Serie Instalación E Instrucciones De Puesta En Marcha página 9

ENGLISH
For a prolonged shutdown, if there is no risk of frost, it is best not to
drain the pump.
To avoid any blocking of the shaft and the hydraulic system, in frosty
periods, empty the pump by removing the plug (6) and the filling
plug (5). Screw the 2 plugs back in, without tightening them.
The replacement frequencies for the mechanical seal will depend
on pump operating conditions, namely:
• For the mechanical seal, the temperature and pressure of the
liquid pumped
8 . OPERATING TROUBLE :
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
DELIVERY
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
f) The pump turns the wrong way (three-
g) The supply voltage to the motor is too
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 a) Voltage too low:
OVERHEATS
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) The motor fails to run at its normal
INSUFFICIENT
PRESSURE
b) The motor is faulty:
c) Pump poorly filled:
d) The motor turns the wrong way (three-
e) The supply voltage of the motor is too
8.5 THE CIRCUIT-BREAKER
a) The setting of the thermal relay is too
DEVICE IS ON
b) The voltage is too low:
c) One phase is open-circuit:
d) The thermal relay of the circuit-
e) A fuse is off:
8.6 THE FLOW IS
a) The suction height (SH) is exceeded:
IRREGULAR b) The diameter of the suction pipe is
c) The strainer and suction pipe are
CAUSES
foreign bodies:
generally accompanied
cavitation noise:
phase motor):
low:
speed (foreign bodies, defective
power supply, etc.):
phase motor):
low:
low (three-phase motor):
breaker is faulty:
smaller than that of the pump:
partially obstructed:
• For the motor and other components, pressure head and ambient
temperature.
• Priming frequency, duty continuous or periodic.
The mechanical seal do not require special servicing in operation.
Bearings are lubricated for lifetime and do not require any
lubrication.
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
by installed).
f) Interchange two phase wires on the motor terminal block or circuit-breaker to reverse
the direction of rotation.
g) Check the voltage on the terminals of the motor and the cross-sections 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.
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) To conform to the motor plate.
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 the voltage at the terminals of the motor and the cross-section of the
conductors and of the coupling.
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) Reread 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.
9
REMEDIES