salmson ALTI-H Manuel D'installation Et Mise En Service page 10

ENGLISH
8. OPERATING TROUBLE
Before any action, POWER DOWN the module.
TROUBLE
8.1 ONE OR TWO a) Air leak at suction:
PUMPS FAIL TO
PRIME
b) Foot valve-strainer (Version "B") not tight or
obstructed:
c) Large losses of head at suction:
d) Town water pressure too low or zero:
e) Suction height too large (version "B"):
f) Suction piping obstructed or valve on suc-
tion pipe closed:
8.2 ONE PUMP FAILS a) Pump shaft stalled:
TO RUN
b) Winding fault:
c) Electrical problem:
8.3 NO DISCHARGE a) Flow requested greater than capabilities of
PRESSURE the module:
b) One or two pumps have lost water:
c) Town water pressure less than anticipated
minimum pressure:
d) A pump is obstructed by foreign bodies:
e) Electrical problem:
8.4 FREQUENT TRIP- a) Dry-running pressure switch set too high:
PING OF THE DRY- b) Drop of town water pressure when pumps
RUNNING SAFETY
start:
8.5 RANDOM OPERA-
a) Pressure transmitter defective:
TION, FREQUENT
b) Capacity of installation too small:
STARTING OF THE c) No air in bladder tank:
PUMPS
8.6 DEFECTIVE AUTO- a) Electrical problem:
MATION OF OPE-
b) Capillary obstructed:
RATION
8.7 DISCHARGE
a) Diaphragm of check valve destroyed:
CHECK VALVE NOT
TIGHT
CAUSE
a) Check the tightness of all suction piping connections.
Check if the suction strainer (Version "B") is correctly covered with water.
b) Check the tightness of the check valve; replace it if necessary.
c) Calculate the losses of head and make sure that they are compatible with the
NPSH of the pumps.
d) If the phenomenon recurs, it is important to go through a buffer tank.
e) Make sure that the minimum buffer tank level is compatible with the NPSH of the
pumps.
f) Check the opening of the valve and clean the piping if necessary.
a) Cut off power to the box, then check that the shaft turns freely; if it is stalled, dis-
mantle the pump.
b) Disconnect the terminal block of the motor concerned and check the mains
power on the terminals and the stator insulation; replace the motor if necessary.
c) To refer to the control cabinet operating manual.
a) Consider replacing the module by a more suitable one (get in touch with us in all
cases).
b) Check that the suction strainer (Version "B") does not let in air and that the tank
filling point is not too close to the strainer.
c) Get in touch with the Water Board or replace the module. Get in touch with us.
d) Have the pump dismantled and cleaned.
e) To refer to the control cabinet operating manual.
a) Adjust the pressure switch correctly.
b) Set the dry-running pressure switch to its minimum. If the phenomenon persists, the
town water network is inadequate; check the pressure on the pressure gauge
when the pumps start, or get in touch with the Water Board.
a) Check the adjustment: instability of the transmitter. If necessary, replace it.
b) Install an additional bladder tank.
c) Pressurize the tank or replace the bladder.
a) To refer to the control cabinet operating manual.
b) Clean the capillary.
a) Replace the check valves.
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REMEDIAL ACTION